Iptables dport multiple ports. 5 -dport 6784 -j DROP And I got.

Iptables dport multiple ports conf. 111:8765? iptables -t nat -A PREROUTING -p tcp --dport 443 -j REDIRECT --to-ports 8443 Then also allow the outgoing response from 8443 go to 443 (right?) iptables -t nat -I OUTPUT -p tcp --dport 443 -j REDIRECT --to-ports 8443 My scenario: I have an application server locally using 8443 but I want all traffic to connect using standard ports. 5) - you don't have IP aliases and you don't have multiple exit IPs but a single IP. 15 to a different proxy (proxy2) which listens on port 1088. Dec 11, 2014 · Link at the bottom of your question is aimed at people who have multiple exit IPs. 4 --dport 80 -j DROP $ iptables -A INPUT -i eth1 -p tcp -s 192. In this tutorial, we’ll discuss how to specify multiple source IP addresses in a single rule. 3 iptables -t nat -A PREROUTING -i eth0 -d 192. 147. My problem is, I am unable to reliably set the --to-source field in iptables. 0/8 -j ACCEPT iptables -A PREROUTING -t nat -i eth0 -p udp --dport 514 -j REDIRECT --to-ports 10514-10515 Chain PREROUTING (policy ACCEPT 1550 packets, 93888 bytes) pkts bytes target prot opt in out source destination 424 72586 Jan 27, 2023 · iptables -A INPUT -p udp -m multiport --sports 30000:65535 --dport 3074 -j ACCEPT iptables v1. A range of ports. Source ports when you'd like to allow replies to connections from local processes and destination ports when you'd like to allow access to external services to local users, like allowing traffic to the destination tcp port 80 for http. 4 AND port-22 ) OR target-DROP (4) NOT ( ip-1. 1 Interpreting the Results. 169. 10 then you just have to look at these rules in order. To redirect a single port with iptables: iptables -t nat -A PREROUTING -i eth0 -p udp --dport 5062 -j REDIRECT --to-ports 5060 This example redirects UPD port 5062 to port 5060, which iptables -t nat -A PREROUTING -p tcp --dport 2525 -j REDIRECT --to-ports 25 What is the correct way of forwarding traffic from a single ip on port 80, lets say 111. y -j ACCEPT iptables -A INPUT -p tcp --dport 22 -s x. 2. 3. Here’s an example of how to forward multiple ports: Open the iptables configuration file for editing: Jun 29, 2017 · This tutorial shows you how to use multiple IP address in source or destination with IPtables on Linux. rules After rebooting my system I ran sudo iptables -L and the line Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp dpt:https Aug 29, 2012 · # Q:I dont understand though why my rules keeps letting me in # A:clean the chains 1st iptables -F iptables -X iptables -Z # Set default policy to DROP if not matched by any rule iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP # Accept incoming connections only if previously established. There is no limit to the number of ports you can specify. Dec 20, 2014 · 例えばApacheをたてて、iptablesを書く場合、--dportは80と443に して、通信を許可することなどがあると思います。 その場合、私は今まで下記のように2レコードのiptablesを書いていました。 Apr 4, 2022 · Use iptables-save to display the ruleset in iptables format, and use iptables as usual to alter rules since it was created using iptables (as systematically seeing a counter rule hints): iptables -A INPUT -p tcp --dport 4001 -j ACCEPT iptables -A phonesystem -p tcp --dport 4001 -j ACCEPT Jul 29, 2011 · to forward to a port range:-A PREROUTING -d <receiving ip> -p tcp --dport <start of port range>:<end of port range> -j DNAT --to <destination ip> --sport <start of port range>:<end of port range> Create a new chain which will accept any TCP and UDP packets, and jump to that chain from the individual IP/port permissive rules: iptables -N ACCEPT_TCP_UDP iptables -A ACCEPT_TCP_UDP -p tcp -j ACCEPT iptables -A ACCEPT_TCP_UDP -p udp -j ACCEPT iptables -A zone_lan_forward -d 1. 5 -p tcp --dport 80 -j REDIRECT --to-ports 8123 Nov 13, 2017 · I want to port forward requests from NIC1 and NIC2 to a specific server on NIC3. See the description of the --source-port option of the TCP extension for details. Instead of allowing just one port (the SSH port, 22), the next example includes a port range. 53,1024:65535 would therefore match ports 53 and all from 1024 through 65535. How does it work? A UDP/IP packet conveys the following information: Source Address; Source Port; Destination Address; Destination Port Mar 24, 2016 · second line: "iptables -A FORWARD -p tcp -d 192. For example, to apply the rule to all ports except 53 (domain) and 22 (ssh) you could do the following: Mar 20, 2020 · As the answer is tied to the configuration, I make some assumptions. i have the Apr 29, 2015 · Exactly what NaN answered, you specify multiple -L arguments. I would think we could also do this via a firewall rule, but I wanted to see if the easest path was available first Oct 13, 2020 · I need to create iptables rules for the following scenario: Different hosts send UDP data to host A. Following that I used the following iptables rules: iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -p tcp --dport 20:21 --syn -m conntrack --ctstate NEW -j ACCEPT iptables -A INPUT -p tcp --dport 1024: --syn -m conntrack --ctstate NEW -j ACCEPT Mar 18, 2024 · iptables is a command-line firewall program that uses several policy chains to allow or block network traffic. 1:8080. I used the command below to set up iptables: Oct 22, 2016 · Match if the source port is one of the given ports. Host A (8. I haven't ever tried using the logical ! operator with it, but it may work. 45. Mar 28, 2019 · It there a way to make wireguar listen to multiple port ? Like listenning on 80,53,and 4444. Mar 21, 2017 · iptables -I INPUT 1 -s xxx. How do I change this rule to say : Dec 27, 2023 · sudo iptables -t nat -A HTTP-FORWARD -p tcp --dport 80 -j DNAT \ --to 192. 0/24 and 84. Multiple destination ports seem work on the same port range, such as 30000:31000 <----> 30000:31000. This command allows incoming TCP traffic on port 8080. Looking at the rule below : iptables -t nat -A PREROUTING -p tcp --dport 443 --jump DNAT --to-destination 129. 0. iptables -A INPUT -p tcp --dport 2001 -s 2. 4. 254/255. 7 i can use rule to block IPs in my IPSet from accessing one port, example SSH: -A INPUT -p tcp --dport 22 -m set --match-set blocklist src -j DROP (note that this is not iptables command but a line from a save file "iptalbes-save > output") But how to block Apr 20, 2016 · # Redirect everything else to the proxy listening on port 1080 iptables -t nat -A PROXY -p tcp -j REDIRECT --to-ports 1080 iptables -t nat -I PREROUTING -p tcp -j PROXY As mentioned this works fine for proxy1 but I am trying to redirect traffic in a similar way for destination 10. 06 branch (git-19. 126 -j ACCEPT. This is my ipt Dec 2, 2016 · I want to open a range of TCP ports in nftables on my servers. In order to work with Bittorrent client you need to open these ports on firewall. 1) on ports 30000-32000. xxx -j ACCEPT Rule to allow specific ip to access to specific port. how can i configure iptables, to drop incoming connections for a Feb 10, 2014 · Since the iptables rules are executed in order (the first match applies, the following rules are not even tested), you can do it as follows:. ***/32 -p udp -m multiport --dports 53,80,443,554 -j REDIRECT --to-ports 51819 iptables -A INPUT -p udp --dport 554 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -p udp --sport 554 -m conntrack --ctstate ESTABLISHED -j ACCEPT Last two commands repeated for every port. This works for me on my test system (bookworm, not sid, but there shoudn't be relevant differences, I guess): $ iptables -A OUTPUT -m owner --uid 0 $ iptables -L OUTPUT Chain OUTPUT (policy ACCEPT) target prot opt source destination all -- anywhere anywhere owner UID match root $ dpkg -l iptables | grep ^i ii iptables 1. Unless you specify -m <protocol> or -p <protocol> with a specific protocol you can't use --dport A way to do this: iptables -m multiport --dport 11,12,13,14 -m comment --comment service. The iptables can assign this action without setting port range in "--to-destination". To open a specific port for incoming or outgoing traffic, such as port 8080, you can replace the port 8080 with any port number you required to open. sorry, i missed the sid. XXX -m state --state NEW -m tcp -p tcp --dport 33332 -j ACCEPT Rule to allow access to specific port. You create a separate user specifically to run mitmproxy and then exclude that user's uid in the iptables filter. 111:5640. Mar 9, 2015 · To resume, a client is sending mail through a remote server and the remote server itself connect to another remote server on port 587 with SASL authentication. iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE iptables -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT Nov 3, 2017 · iptables -A OUTPUT -d DNSServer -p udp -dport 53 -j ACCEPT iptables -A INPUT -s DNSServer -p udp -sport 53 -j ACCEPT Basically, DNS queries uses UDP unless queries/answer are less or equal than 512 bytes. I am new to this. The option for controlling the interval is hopInterval in the transport section: Nov 19, 2018 · iptables -t nat -A OUTPUT -p tcp -d IP1 --dport 54321 -j REDIRECT --to-ports 8080 iptables -t nat -A OUTPUT -p tcp --dport 54321 -j DNAT --to-destination 127. Conntrack is the module that allows IPTables to filter packets not just as individual packages, but as part of a connection. 31' option dest_port '53 80 3074' option name 'Allow-Xbox-Live-TCP' config redirect option Oct 10, 2015 · I've struggled a lot to find this and finally found a solution that absolutely works, the command in your case would be: iptables -t nat -A DOCKER ! -i docker0 -p tcp -m tcp --dport 32770:32771 -j DNAT --to-destination 172. Additional Information. A Address can be either a network name, a hostname (probably a really bad idea to use hostnames), a network IP address (with /mask), or a plain IP address. Pay attention to: Which ports are “LISTENING” or “open. Oct 10, 2017 · I need to open multiple different ports (not in ranges) on a CentOS machine. 1 (allow MYSQL on Port 3306) # IP two: 192. In such case, the following iptable rules applies (for the smarthost) iptables -I OUTPUT -p -tcp -dport 597 -j ACCEPT iptables -I INPUT -p -tcp -sport 587 -j ACCEPT In this port forwarding scenario there are some instances where I do not want it to port forward. 17 for support, while ingress has Nov 11, 2015 · iptables とは. 200 --dport 8080 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT" is NOT required if you don't have firewall restrictions/security, which is the case with most of home LANs, otherwise be careful with -A, be cause it will add it AFTER restrictions/security and may not work (so check -I instead, that is adding IN FRONT of iptables rules) Aug 29, 2021 · Defining multiple addresses using only one iptables command using ! --source is not possible. I don't understand what this line does: Oct 18, 2018 · Is there a way to delete multiple lines in an iptables not knowing what is in my iptables? For example, I want to delete every port forwarding from port 80 and here is the iptables: Chain PREROU There is no way to make a single instance of Asterisk listen on multiple ports. The multiport match module matches a set of source or destination ports. Voila! iptables -I INPUT 1 -p tcp -s 1. I am trying to restrict MySQL 3306 port on a linux machine from making any connections to anything other than localhost to prevent outside attacks. xxx. 1 -j ACCEPT iptables -A INPUT -p tcp --dport 2001 -j DROP service iptables save and everything work fine. I'm using this config for iptables: iptables -t nat -I PREROUTING --source 0/0 --destination 0/0 -p tcp \ --dport 4 Jan 4, 2010 · Ok, I'm working with an OpenWRT router. fails: "unknown option: --dport" iptables -A INPUT -p tcp -m tcp --dport ssh -j ACCEPT Mar 25, 2023 · It's also not too hard to create rules that look at the direction of the connection with iptables, just allow existing connections with iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT and then make rules for new ones with e. 4 --dport 12345 -j DNAT --to-destination 192. How can I do it in a one iptables line? I tried running this: iptables -I INPUT -d 127. 30. The client will randomly select one of the specified ports for the initial connection and will periodically switch to a different port. Nov 13, 2017 · I need an linux firewall rule that will accomplish the following: iptables –A INPUT rule that will accept any packet that comes in over ports 43,53 or 67. # Redirect everything else to the proxy listening on port 1080 iptables -t nat -A PROXY -p tcp -j REDIRECT --to-ports 1080 iptables -t nat -I PREROUTING -p tcp -j PROXY As mentioned this works fine for proxy1 but I am trying to redirect traffic in a similar way for destination 10. I am starting the container like this so it can have its own iptables, docker run -it --cap-add=NET_ADMIN --sysctl net. ipv4. 1. 27. Nov 30, 2019 · # create a new chain iptables --new-chain multiple_sources_smtp # send all SMTP connections to the new chain iptables --append INPUT --protocol tcp --dport 25 --jump multiple_sources_smtp # use the default INPUT rules for packets coming from allowed sources iptables --append multiple_sources_smtp --source 10. Also I need this site to be accessed from wan:777. Make sure to restart the iptables service after the change. But when i want add another ip to allow with this command it doesn't work for second IP. 0/16 -p tcp --dport 80 -j DNAT --to 10. XXX. prod, dev, test, etc) and I'm trying to write the IPTables file for my RHEL 6. Depending on the exact use case, the duplication can also probably be done on egress (since it's on the loopback interface, the duplicated egress packet will appear back as ingress) but this would require kernel >= 5. (You may take a look at the demo graph link below to understand what I would like to achieve :D ) Forward to different ports. You'd need to *allow* those ports for that source IP and then drop all others (put the 2 port match rules first and then put the drop rule after). 111. #iptables -A INPUT -p tcp --match multiport --dports 110,143,993,995 -j ACCEPT iptables -A INPUT -p tcp --dport 1000:2000 will open up inbound traffic to TCP ports 1000 to 2000 inclusive. Jun 28, 2016 · iptables -A INPUT -j DROP Allow all OUTPUT. To open a specific port , like port 8080 for TCP. 36:1000-1002/32770 Dec 23, 2013 · iptables -A INPUT -p tcp --dport X -j ACCEPT iptables -A INPUT -p tcp --dport Y -j ACCEPT iptables -A INPUT -p tcp -j DROP You did not specify protocol (TCP or UDP) and I am assuming TCP as it is clear above. I would like to have VPS B(2. There might be cases where we need to specify multiple source IP addresses for filtering packets. Feature Idea. 5 -dport 6784 -j DROP And I got. x. However, you can use an iptables REDIRECT to achieve the same functionality. wan1's LAN and gateway for wan1 arbitrarily chosen as 84. Basically you need to open ports using iptables. 21: multiport: option "--source-ports" cannot be used together with "--destination-ports". Feb 6, 2019 · Let's say, receive an SNMP trap on UDP port 162, and redirect the package to ports 10162 and 20162 (both of them). eth0. Jun 17, 2011 · The multiport extension has a limit (15) for the ports that can be specified. The target port is 1234. May 4, 2021 · 网上抄录： iptables可以方便的配置多个端口。其中根据端口的连续性，又可分为连续端口配置和不连续端口配置。1、连续端口配置 如： -A INPUT -p tcp -dport 21:25 -j DROPA INPUT -p tcp -dport 21:25 -j DROP 注：这里是英文状态下的冒号。 May 12, 2014 · I'm relatively new working with iptables but have a decent understanding of the concepts. This is a single section of the command. 230 iptables -t nat -A POSTROUTING -j MASQUERADE Now where I should put the ports that I don't want to forward, like: 22 80 443 2082 2083 2086 2087 20 21? Aug 1, 2015 · $ sudo iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all Apr 19, 2013 · HOW TO FORWARD PORTS TO YOUR DEVICES WITH IPTABLES You need to create a basic DNAT on your router. Jun 12, 2020 · This module matches a set of source or destination ports. 41695-6f6641d) I am trying to forward multiple ports to some devices. ] Conclusion May 11, 2024 · iptables -A INPUT -p tcp -m multiport --dports 22,80,443 -s 10. y. 200. 55. Current rules im trying based on the above question: Apr 5, 2016 · Thank for your suggestion. I have the following iptable rules: iptables -t nat -I prerouting_rule -m mac --mac-source $2 -p tcp --dport 80 -j DNAT --to-destination $3:80; iptables -t Dec 13, 2011 · To block all service requests on port 80, enter: # iptables -A INPUT -p tcp --dport 80 -j DROP # iptables -A INPUT -i eth1 -p tcp --dport 80 -j DROP. 1/8 -p tcp -m multiport --sports 80,443 --dport 8081 -j NFQUEUE but this is the error: Jan 8, 2013 · Well there are like 1 million scripts/tutorials/things for this case, but if someone lands from google to here is something like this: iptables -I FORWARD -d 2. For opening the incoming traffic: iptables -A INPUT -p tcp --dport 8000 -j ACCEPT. I am able to do this, and everything works properly. 4, enter: # iptables -A INPUT -p tcp -s 1. 80. 200/16 from accessing this rule. 0/0 -p tcp --dport 9000 -j # allow inbound and outbound forwarding iptables -A FORWARD -p tcp -d 192. In order to forward incoming http connections from port 80 (default) to port 5000 (which was the port my react app was serving on) I did the following: sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 5000 sudo /sbin/iptables Add -m multiport and replace --dport with --dports to intercept multiple ports (or just repeat the line with a different port). 2 -m comment --comment "Accept to forward ssh traffic" -m tcp -p tcp --dport 22 -j ACCEPT iptables -I FORWARD -m comment --comment "Accept to forward ssh return traffic" -s 2. The flag --sports is a convenient alias for this option. You'll have to adapt the answer to fit the actual configuration. Dec 8, 2005 · I already wrote about Linux command line bittorrent client. On lan:80 I have a site that must be accessed from local network. Putting the other rule Sep 5, 2019 · I have my internet router forward port 80's to the hypervisor and the hypervisor just NAT's port 80 to the private IP associated with the KVM:-A PREROUTING -d 192. 平たく言うとLinuxに標準で搭載されているFirewallですよね？ CentOSに標準で搭載されているFirewallですか！！（CentOS7の標準はFirewalld） Firewalldはiptablesを管理するフロントエンドのようですね！？ 環境. 0/24 --dport 80 -j DROP I'd guess only the first line is needed. Nov 21, 2019 · iptables -t nat -A PREROUTING -i eth0 -p udp --dport 3070 -j DNAT --to-destination 192. 3 iptables -A FORWARD -i eth0 -d 192. 111:5640 However, this does not work, because the UDP packet looks at the iptables' rules, and goes to 192. 5. 9/32 -i eth0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 10. If the first rule doesn't match it is going to pass down MASQ rule which it will match. xxx -p tcp --dport 8123 -j DNAT --to-destination 10. 10. Stack Exchange Network. 4) redirects the received UDP data to hosts B1 (7. If you need a port range you can use -m multiport together with --dports like that: Unix one liner to open up multiple ports on IPTABLES. So if there are up to 7 ranges (+1 single port), you can do something like: iptables -A INPUT -p tcp -m multiport --dports 1:5,10:50,6666 -j DROP Multiple individual ports. This cheat sheet-style guide provides a quick reference to iptables commands that will create firewall rules that are useful in common, everyday scenarios. So, for instance I have this defined: iptables -A PREROUTING -t nat -i eth0 '!' -s 10. 1:8080 Reading definitions of DNAT and REDIRECT still leave me confused what should work here. 32. These options are listed in iptables-extensions(8) in the section multiport, tcp, udp and elsewhere. 2. iptables -A OUTPUT -j ACCEPT Route all packets FROM the subnet to the outside. 2:3128 iptables -t nat -A PREROUTING -i tun0 -p tcp --dport 80 -j REDIRECT --to-port 3128 Assuming: tun0 = vpn interface 192. And this mitmproxy forum thread has a solution so you don't have to run as root. Jul 6, 2020 · iptablesによる実装. As it turns out, I need to add multiple exclusions. iptables -A INPUT -m state --state NEW -p tcp --dport 22 --source xyz -j ACCEPT To open a port or a range of ports in iptables on RHEL, you’ll need to use the iptables command to configure the firewall rules. iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 33332 -j ACCEPT One rule for more ports I've tried the following iptables commands, but it didn't help: iptables -A FORWARD -p tcp --dport 80 -o eth1 -j ACCEPT iptables -A FORWARD -p tcp --sport 80 -o eth0 -j ACCEPT I'm not sure how to go about this. Of course, it can only be used in conjunction with -p tcp. iptables -A INPUT -p tcp --dport ssh -j ACCEPT. I know how to open a port with firewall-cmd, but that gets bothersome for opening like 40 and more ports. 186 -j DNAT --to-destination 10. The most simple path I can imagine would be if we could configure mimtdump to listen on more than one port. 1:443 # server B - new rules iptables -A PREROUTING -t nat -i em3 -p tcp --dport 80 -j DNAT --to 192. 114. Blocking ICMP Traffic. 6 servers which allows specific groups of machines to talk between those environments on defined ports. 111:5640 iptables -t nat -A PREROUTING -i eth0 -p udp --dport 3070 -j DNAT --to-destination 167. Issue Type. 5 and 192. 2 -j ACCEPT service iptables save Oct 1, 2010 · The key to iptables is the first match wins. 10 --dport 54321 -j ACCEPT iptables -A FORWARD -p tcp -s 192. 5:6784. Aug 31, 2016 · I would like to be able to distinguish users based on their port. the-port-openvpn-is-listening-on is the port which your OpenVPN server instance is actually listening on. Jan 16, 2022 · Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have I want to redirect all traffic from port 443 to the internal port 8080. 2 is Mar 11, 2022 · so, this is a lot of info. tcp dport {1000:2000} accept but nft reports Aug 13, 2012 · Is it possible to add a IPTABLES rule which allows all the protocols for specific source and destination ports? I tried the following but it didn't work. iptables. 10 --sport 54321 -j ACCEPT # route packets arriving at external IP/port to LAN machine iptables -A PREROUTING -t nat -p tcp -d 1. Sep 16, 2010 · my server has two ip's: # IP one: 192. Do you have to have -p "protocol" before --dport 43,53,67 or can you take out the -p "protocol" and just have the --dport 43,53,67. FORWARD Chain When adding an IPTables port forward, but sure to use the -I (capital i) to insert the rule. 44. 2:80 iptables -A PREROUTING -t nat -i em3 -p May 30, 2022 · Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Oct 19, 2015 · The standard way of DNATing a single port to a different port on an internal network is something like that: ip(6)tables -t nat -A PREROUTING -i wan0 -p tcp --dport 80 --to-destination 10. Assuming the client machine is 10. y -j ACCEPT iptables -A INPUT -p tcp --dport 6379 -s y. 25. A port range (port:port) counts as two ports. How can I achieve this using iptables? I can successfully redirect the package to port 10162 using: iptables -t nat -A PREROUTING -i eth0 -p udp --dport 162 -j REDIRECT --to-port 10162 Is it possible to redirect the package to two Hey guys in my iptables file I have the following line:-A INPUT -m state --state NEW -m tcp -p tcp --dport 20000:25000 -j ACCEPT Because I'm trying to open a range of ports that will need to be open for multiple (Yes THAT many multiple) different minecraft servers. I'm looking to achieve this without running multiple wire guard separate interface, to prevent having to create different subnet for the same thing. Back to the point if I want to assign different multiple destination ports, such as 30000:31000 ----> 40000:41000. Port 22 will not be opened by this rule, but 50 other ports will be, using the multiport module. Since you are trying to push packages through eth0 (192. I want to forward that call using iptables to Service B. If you want to run multiple iptables commands from one Chef resource, you can use the bash resource. In most cases, what will happen with a connection depends on the first rule, which it matches. rules post-down iptables-save > /etc/iptables. The “–dport 22” spec Jul 2, 2006 · There is a multiport match (mport) that allows you to specify up to 15 ports. Component Name. 94. 123. 6 Nov 3, 2015 · One, at least in that manner; --dport (on its own) doesn't take a list of ports. -m multiport --dports is only needed if the range you want to open is not continuous, eg -m multiport --dports 80,443 , which will open up HTTP and HTTPS only - not the ones in between. CentOS6. This includes iptables examples of allowing and blocking various services by port, network interface, and source IP address. 123 This matches TCP traffic on destination port 80 and redirects it to our web server at 192. 11 This will prevent 10. Oct 1, 2017 · I have services running on VPS A(1. We’ll begin by covering the theoretical aspects of iptables and then demonstrate practical code examples to illustrate how we can manipulate port-based traffic filtering. iptables -A INPUT -p tcp --dport Feb 10, 2022 · Hi @Azrael,. 6; iptables 1. 88:5000 this tells me all traffic destined for port 443 should be diverted to 129. Let‘s break the rule syntax down piece by piece: Sep 6, 2019 · iptables -A INPUT -p udp --dport 10514 -s 10. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. iptables -A INPUT -s XXX. I do this all the time. 78 --dport 22 -m state --state NEW,ESTABLISHED -j DROP May 25, 2024 · This question was fairly close, but no working answers: Use iptables to port forward multiple ports. . 7. 転送元サーバで、以下のコマンドを実行 (1) PREROUTINGチェイン. `. Introduction to the Problem Dec 18, 2017 · ### Block Incoming Port Requests (BLOCK PORT) # To block port 80 only for an ip address 1. Replace 8080 with the required port number you wish to open: Jun 7, 2022 · This can be done with nftables and netdev family with an ingress chain and a dup statement. 4 --dport 80 -j DROP # iptables -A INPUT -i eth1 -p tcp -s 192. Jan 5, 2025 · To check a specific port: sudo nmap -p 22 127. 31. 0/24-m state --state NEW -j ACCEPT. 1:80 iptables -A PREROUTING -t nat -i em3 -p tcp --dport 443 -j DNAT --to 192. 020. 111:80 to another port on the same server, lets say 111. I haven't, however, found a good example online that demonstrates what I'm asking. But I need to specify much more port numbers in a single rule, so I tried to use several multiport in one rule like: iptables -A INPUT -p tcp -m multiport --destination-ports 59100 -m multiport --destination-ports 3000 -m state --state NEW -j REJECT --reject-with tcp Oct 2, 2024 · In this article, we’ll go through how to use iptables to manage multiple ports efficiently. yml is below) file: iptables -I DOCKER-USER -i docker0 -s 0. Apr 13, 2009 · The Linux iptables comes with MATCH EXTENSIONS which can use extended packet matching modules. Specifying Multiple Ports with iptables -A INPUT -p tcp --dport 22 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -p tcp --sport 22 -m Nov 27, 2014 · iptables -t nat -A PREROUTING -p tcp --dport 30000:30200 -j REDIRECT --to-ports 443 redirects ports 30000 thru 30200 to port 443 where the zm webserver is listening. So it w Oct 19, 2020 · iptables -t nat -I PREROUTING -i eth0 -d 46. 4 -dport 22 -j DROP Does the "!" mean (1) NOT ( ip-1. 15. The “d” in “dport” stands for destination. iptables -A INPUT -p tcp 1000:2000 -j ACCEPT I tried to write in the same way in /etc/nftables. Unfortunately so far I've only managed to change the source port: iptables -t nat -A POSTROUTING -p udp --dport 162 -j SNAT --to :1620 I am looking for a way to forward all traffic(to any port) from a pc to a certain ip. You need to insert the rules in this specific order and I am assuming no other pre-defined rules. In the examples below, the rules are inserted at position 1 in the forward chain. 36. generally you'll deal with destination ports in the INPUT chain while the output chain might handle both. iptables -I FORWARD 1 -s 172. If not, then you likely need to do the inverse of what you're trying to do. I have a debian box with two interfaces wan and lan(192. 4) OR port-22 OR target-DROP, or (3) NOT ( ip-1. Mar 1, 2017 · iptables -I INPUT ! -s 1. 10:54321 Mar 24, 2020 · The best answer I found for allowing FTP traffic with iptables is here. What I want to do: Server 1: forward port 1-10000 to -> [SERVER-2] port 20000-29999. 4 AND port-22 ) AND target-DROP (n) Feb 19, 2014 · pre-up iptables-restore < /etc/iptables. 17. Multiple ports or port ranges are separated using a comma, and a port range is specified using a colon. Remember that the router GUI forwards ports from the WAN to LAN. I saw a post similar to this one where someone asked about routing traffic from certain ports and/or IP's to a single port/IP however that is not what I am Nov 6, 2017 · # iptables -A OUTPUT -p tcp --dport 22 --dst 192. May 17, 2016 · Stack Exchange Network. So, first we accept our friends connection, second, we drop anybody other. 1) Sep 21, 2017 · Service A is a black-box and makes a call to an IP 169. 2 -j DNAT --to 192. ===== Output of ip addr show May 14, 2014 · iptables -t nat -I PREROUTING -p tcp -m tcp --dport 30000:40000 -j DNAT --to [local_ip]:10000-20000 Then instead of mapping each port with it's corresponding port all incomming connections on ports 30000-40000 are instead mapped to the same ( random i think ) port on the secondary host ( at the moment they are all going to 13675 ). So for example if I started the server on port 3478 and 3479 (default STUN ports) and port 5000, I have observed that my public ports stays the same for ports 3478 and Jul 2, 2016 · You need multiple rules to do that. 8. [Need assistance to block ports using Iptables? – We are available 24/7. I would like to offer a shorter bit of info that might help people. One commonly used feature in iptables is blocking ICMP traffic, often generated by the iptables -t raw -A PREROUTING -p tcp --dport 6667 -j NOTRACK iptables -A INPUT -p tcp --dport 6667 -j TARPIT TCPMSS This target allows to alter the MSS value of TCP SYN packets, to control the maximum size for that connection (usually limiting it to your outgoing interface's MTU minus 40). 0/24 --dport 80 -j DROP. 1 You can specify multiple rules to cover multiple ports, but also specify port ranges using [port]:[port], or negative matches using !. It requires using a mark to avoid an infinite loop. In order to do some brute-force intrusion mitigation, I've got a chain that includes a rule covering multiple ports (this rule originally hijacked from this blog): --dport is not a flag for general iptables rules. 9:80 Therefore I use the following iptables entry for the ip of my external interface (ext_if): iptables -I DOCKER-USER -i eth0 ! -s ext_if -j DROP Then I want to open a specific port to a container, which is configured in a docker-compose (my docker-compose. multiport: A module for managing multiple ports simultaneously. 132:12601 iptables -I FORWARD -i vlan2 -d 192. Jul 9, 2021 · Iptables is a software firewall for Linux distributions. Therefore, it is imperative that you do NOT forward ports in the GU Nov 27, 2018 · iptables -A INPUT -p tcp --dport 2001 -s 1. 06. The Insert chain is needed because the default is to insert Sep 6, 2023 · –dport 22 tells IPTables that we want to focus our attention on port number 22. Oct 24, 2019 · iptables -P INPUT DROP # Exceptions to default policy iptables -A INPUT -p tcp --dport 80 -j ACCEPT # HTTP iptables -A INPUT -p tcp --dport 443 -j ACCEPT # HTTPS So, this blocks the incoming connections to all ports other than 80,443. Sep 23, 2018 · 30000:31000 are additional ports you want your OpenVPN server to listen on. Jan 8, 2010 · Examples: • allow 2 telnet connections per client host: iptables -A INPUT -p tcp --syn --dport 23 -m connlimit --connlimit-above 2 -j REJECT • you can also match the other way around: iptables -A INPUT -p tcp --syn --dport 23 -m connlimit --connlimit-upto 2 -j ACCEPT • limit the number of parallel HTTP requests to 16 per class C sized Apr 14, 2023 · iptables -t nat -A PREROUTING -p tcp --dport 22 -j DNAT --to-destination 37. This is what I have so far: -A INPUT -p udp -m udp --dport <some port> -j ACCEPT -A OUTPUT -p udp -m udp --sport <some port> -j ACCEPT To be frank though, without listing your current iptables config, there's no way to tell what's going on though you can have some 'dmesg' debug lines to help you out there: Mar 16, 2019 · Firmware: OpenWrt 18. A combination of both. -m conntrack –ctstate NEW,ESTABLISHED . 132 -p tcp --dport 12601 -j ACCEPT At this point, if I deactivate the OpenVPN daemon on the router, SSH into the RPI is working. 4:8123 However, when I try to redirect a UDP port, I see it closed from the outside. iptables -t nat -A PREROUTING -i eth0 -d 192. 2 = IP of your server on tun0 (vpn) Is it possible to change the destination port of a UDP packet using iptables? I'm trying to get an SNMP agent to send out traps on 1620 instead of 162. Traffic originating from a docker container on the host will not Seems you had asked this question before and it was linked to this question. config redirect option target 'DNAT' option src 'wan' option dest 'lan' option proto 'tcp' option src_dport '53 80 3074' option dest_ip '192. When connected to the VPN you must forward ports from TUN to LAN. 242. May 4, 2017 · Centos/RH6: iptables rule to allow all ports to specific IP Hot Network Questions What is the best way to prevent this ground rod from being a trip hazard Aug 25, 2016 · A possible modification to the iptables rules is to remove both and replace with: iptables -t nat -A PREROUTING -p tcp -m tcp -i eth0 --dport 80 -j REDIRECT --to-ports 8080 This will ensure that, for my case, only TCP traffic on port 80 through interface eth0 will be redirected. 2 -m tcp -p tcp --sport 22 -j ACCEPT iptables -t nat Sep 24, 2024 · Step 3: Open a Specific Port for Incoming or Outgoing Traffic. Dec 30, 2016 · iptables -t nat -I PREROUTING -p tcp --dport 12601 -j DNAT --to 192. 82 iptables -t nat -A PREROUTING -j DNAT --to-destination 151. 52. Without this, my rules are about twice as long, and end up requiring logical rules to be split across lines (like for 3 ports related to NFS) Jul 8, 2017 · Hello, on CentOS 6, iptables 1. This might be interesting to you. Example 4. Bittorrent client by default uses tcp 6881 to 6889 ports only. Here is an example of multi port forwarding: ssh remote-host -L 8822:REMOTE_IP_1:22 -L 9922:REMOTE_IP_2:22 Nov 25, 2020 · I'm trying to add iptables rule on a specific port. クライアントから入ってくるリクエストで、宛先のIPアドレスとポートを変換 --dport: 変換前の宛先ポート番号--to-destination: 変換後の「宛先IP : ポート番号」 -A PREROUTING -i vboxnet0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192. 101. Remember, if you […] Oct 13, 2020 · Port Forwarding can be performed with IPTables to an instance from a Linux host. 88:5000. Specifying a Port Range. However, I received few more queries regarding firewall issues. Up to 15 ports can be specified. 4 --dport 3306 -j ACCEPT iptables -I INPUT 2 -p tcp --dport 3306 -j DROP Apr 21, 2022 · So I tried to block wide range of ports via Iptables. 56. [!] --destination-port,--dport port[:port] Destination port or port range specification. ***. 2 sudo iptables -t nat -A PREROUTING -d 172. 7; 経緯 Apr 27, 2020 · Lets say I'm trying to use iptables to route all tcp traffic from ports 80,443,9090 to a signle port (8080). x -j ACCEPT Source port or port range specification. g. These are loaded when you use -p protocol or -m. Dec 22, 2015 · I tried to add a command like this in my iptables: sudo iptables -A OUTPUT -p tcp --tcp-flags RST RST -d 2. xx. 168. -m multiport enables the use of a list of ports, and that seems to be limited by a variable XT_MULTI_PORTS, which seems to be compiled-in at 15. How to add multiple sources in a single iptables command. This will refresh the previous settings. Just to extend the answer of @xenoterracide You can read more about iptables in the manpage iptables(8) (type man 8 iptables) but there you will not find --dport or --sport. It's a flag for one of it's extended packet matching modules. May 13, 2014 · You have to use --match multiport in the rule for defining more ports. Each time a rule is added, it just pushes the next ones down. 2 --jump RETURN iptables Sep 19, 2022 · And destination port range specification with following option :--destination-port port:port--dport port:port; For example block lock all incoming ssh access at port 22, for source port range 513:65535: iptables -A INPUT -p tcp -s 0/0 --sport 513:65535 -d 195. 254. 7-1 amd64 # nftables not installed Feb 19, 2023 · I have redirected several TCP ports with this command and they all work correctly: iptables -t nat -A PREROUTING -d 82. 21: multiple -d flags not allowed I'm trying to drop RSTs sent from my machine to 2. The syntax is: iptables -A INPUT -s ip1,ip2,ip3 -j ACCEPT iptables -A INPUT -s ip1,ip2,ip3 -j DROP iptables -I INPUT -s ip1,ip2,ip3 -d ip2 -j DROP To accept 92. 2 r7676-cddd7b4c77 / LuCI openwrt-18. 19. 4 AND port-22 AND target-DROP), or (2) (NOT ip-1. iptables -A INPUT -p udp --dport 1195:65535 -j DROP iptables -A OUTPUT -p udp --dport 1195:65535 -j DROP iptables -A INPUT -p tcp --dport 1195:65535 -j DROP iptables -A OUTPUT -p tcp --dport 1195:65535 -j DROP Jul 13, 2024 · I have the following iptables rule that forwards all incoming traffic to an ip in the local network 10. Oct 30, 2018 · iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT ACCEPT iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -p tcp --dport 5432 -s y. Jan 11, 2016 · I have multiple environments (e. 0/24 -j ACCEPT_TCP_UDP Apr 7, 2024 · The following example redirects TCP port 25 to port 2525: # iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 25 -j REDIRECT --to-port 2525 In this example all incoming traffic on port 80 redirect to port 8123: # iptables -t nat -I PREROUTING --src 0/0 --dst 192. See the description of the --destination-port option of the TCP extension for details. To block port 80 only for an ip address 1. 2 (disallow MYSQL on Port 3306) . 4, enter: $ iptables -A INPUT -p tcp -s 1. Biggest port I've seen in the list is 1194 (openvpn), so I wrote this. 0/8 -j ACCEPT iptables -A INPUT -p udp --dport 10515 -s 10. 11. Is that possible? Then we could look at that header info in a script to figure out who was connecting. 2) to port forward them to 20000- 22000. Feb 17, 2023 · To forward multiple ports using iptables in Linux, you can use the multiport module to specify a range of ports or a comma-separated list of ports. iptables v1. 1). ” The processes (PID) or service names associated with each open port. Normally, in netfilter/iptables I can write the rule like this. 2 --dport 22 -j REJECT iptables -A FORWARD -i eth0 -d 192 Sep 26, 2020 · To find ALL OF THE PORTS you simply scan the whole damn spectrum of ports and find out which ports work (on which ports your public ports stays the same) and which do not work. --dports: Specifies multiple ports, unlike --dport, which supports only a single port. Adjust the range to what what you are comfortable with or that meets your needs. route_localnet=1 <name> bash Once in bash, i configure iptables to forward the call, Dec 20, 2012 · You can use iptables NAT table to redirect port 80 and 443 to the proxy port (3128 for squid) using: iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to 192. Jun 17, 2014 · You can set your default action to DROP, and then create exception rules to allow 80 and 443, like so: # Setting default policies: iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT ACCEPT # Exceptions to default policy iptables -A INPUT -p tcp --dport 80 -j ACCEPT # HTTP iptables -A INPUT -p tcp --dport 443 -j ACCEPT # HTTPS May 2, 2018 · # server A - rules already used iptables -A PREROUTING -t nat -i em3 -p tcp --dport 80 -j DNAT --to 192. jdqism fmfz tnxfdy rzvz ixl wkex macmup imx tpzn kelxp