Iptables tee port mirroring like a trusty old hub would do it, or a switch with port mirroring function. 1 i use this solution : Feb 11, 2015 · iptables -t mangle -A PREROUTING -i eth2 -j TEE --gateway 10. 156 iptables-translate -t mangle -A POSTROUTING -s 192. > > I tried the following: > > iptables -s 0. Bad argument `–tee' I then found the following post which had no effect: Mirror Port via iptables End goal, duplicate all traffic, incoming and outgoing, from all sources and all destinations to a Jan 10, 2020 · I have been doing hard testing on port mirroring wit iptables -tee. 123' # interface or IP address to send packets to option protocol 'TEE' # 'TEE' iptables (default) or Topic: iptables port mirroring? The content of this topic has been archived on 26 Apr 2018. To Reproduce ssh into the ro 1 Found this Q&A on ServerFault titled: Copy/Mirror traffic to WAN interfaces without “iptables tee” support. 3 As far as I've been able to You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum r28072 build - Mirroring - Issue due to old Iptables version DD-WRT Forum Index -> X86 based Hardware You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum okay, i have seen the instructions on how to create VLANs and that would be a first step in what i want to do. The following rule duplicates all traffic to 172. 04, and this iptables rule did the trick (no need to patch!): sudo iptables -t mangle -A PREROUTING -p udp --dport 60000 -j TEE --gateway 172. Aug 2, 2018 · iptables -t mangle -A PREROUTING -i eth0 -p udp –dport 12201 -m state \ –state NEW,ESTABLISHED,RELATED -j TEE –gateway 127. First of all you need an OpenWRT compatible router Apr 9, 2014 · I have a question about mirrored with TEE option iptables traffic. Objective: to copy/send or tee packets coming from enp3s4f1 and send to a destination IP via the enp3s4f0 management/data port ServerA = enp3s4f1 (connected to a switch1 span port) (no IP address) port-mirroring is an OpenWrt package that sends copies of network packets from your OpenWrt router to another device on your network or beyond, giving you the ability to monitor and analyze network traffic without additional hardware. I found this stackexchange Q&A: Thus, to clone all incoming and outgoing traffic for pc 192. Jul 10, 2013 · Hi, if there is a different solution i would prefer because i dont want to update iptables or kernel in my firmware project with autotools, it may broke currently development. My router has DDWRT > on it (It is a TP-Link router), but I cannot find a VLAN tab anywhere. Jul 5, 2009 · I have a dd-wrt based router and I'm using iptables to mirror EQ traffic to my SEQ box. Jul 9, 2010 · Hi all, I executed the following commands in my dd-wrt flashed router to set up port mirroring: xxx@xxx:~# iptables -t mangle -A POSTROUTING -j ROUTE --tee --gw 192. 129 sucessfully applied the rules and able see the mirriored traffic. 8 and CentOS 6 runs 1. I want to take everything coming in and going out on port X (could be LAN, could be WAN, could be wireless) to another port. May 18, 2016 · [linkset] port mirroring. 7) has not TEE target support. 5k次。本文介绍如何使用Linux网桥和iptables tee模块实现网络流量的一对多克隆，详细阐述了配置步骤及工作原理，适用于流量监控场景。 Feb 7, 2014 · 我有一个关于TEE选项iptables流量镜像的问题。 主要目标是将服务器A (端口1935)上的所有服务流量复制到同一端口 (端口1935)服务器B上运行的相同服务。 Apr 25, 2018 · My setup consist of 3 VMs : "SENDER" "RECEIVER" "SNIFFER" On "RECEIVER" I'm trying port mirroring with : iptables -t mangle -A PREROUTING -i eth0 -j TEE --gateway "SNIFFER" It's working, 1 Found this Q&A on ServerFault titled: Copy/Mirror traffic to WAN interfaces without “iptables tee” support. The "--tee" option of iptables can mirror network packets to a target ip address. Jul 27, 2017 · Port mirroring takes all packets passing through designated ports on a switch, clones them and routes the copies either to a specific port on the switch, or, in the case of iptables TEE target, sends them out of the port where its MAC table says the listening IP corresponding to the --gateway argument is. 1 to eth0. I don't want to touch the packets. 34. I use iptables with TEE module: iptables -t mangle -A PREROUTING -i eth0 -j TEE --gateway IP_SERVER2 I check the rule: iptables Port Mirror on Your Asus WiFi router with no expensive tap hub/router needed. Mar 25, 2017 · Hi guys, is there a way to port mirror so I can sniff the the WAN traffic or us snort or suricata as IDS, I saw through a search on the web to use the iptables mangle, but it did not work for me, it did not send the packets to the virtual machine IP where I had snort on, I have not adventured I don't care about emails, but SIP signaling and in some instances RTP. 129 iptables -t mangle -I POSTROUTING -j TEE --gateway 10. refer man tc-fw (8): fw - fwmark traffic control filter the fw filter allows to classify packets based on a previously set fwmark by iptables. May 2, 2015 · Hello! Using iptables, I am mirroring all traffic on udp port 1514 from a production CentOS server to a dev CentOS server. iptabes -I POSTROUTING -t mangle ! -s 127. x iptables userspace is not correctly patched. It IS working, so maybe I should leave it at that -- but it seems like there must be a more efficient way of doing it. 18_0) Austin Reed Jul 25, 2020 #merlin #port mirroring #rt-ax88u Enable mirroring of incoming packets checkbox Enable mirroring of outgoing packets checkbox Set the Mirror source port to your EQ computer lan port Set the Mirror monitor port to your ShowEQ computer lan port Click Save & Apply Click System\Reboot\Perform reboot Zone out and you should see skittles on ShowEQ. It includes commands for setting up mirroring, testing with tcpdump, viewing current iptables rules, and removing the rules when necessary. 1 is the router's interface and 172. Take in account that the gateway should be in the same network, if don't , the rule won't work unless you do something Nov 23, 2019 · Personally, I think I'd make your mirroring port part of the WAN VLAN - and then configure "port mirroring" on the swconfig level. 2 -j ROUTE Feb 12, 2018 · Hi there, Want to deploy a monitoring server to visualize and monitor network traffic and behavior in the network. This is a continuation of the work started May 28, 2019 · Hi all! I'm trying to mirror data sent from a Bresser weather station to a WeeWX install (so I can intercept the data sent to rtupdate. May 7, 2024 · 文章浏览阅读3k次。本文介绍如何利用iptables实现网口数据的转发与镜像，包括通过NAT进行转发及使用TEE进行数据镜像的方法，并提供了具体命令实例。 Jan 17, 2016 · This simple tutorial describes how to configure traffic mirroring on your OpenWRT capable router (using iptables) and send it to Snort IDS. On the router, the rules to achieve this are: Aug 13, 2023 · This command cannot be used because it's not duplicating the UDP packets as per this thread: iptables -t nat -A PREROUTING -p udp --dport 1234 -j DNAT --to-destination IP_HOST_B:3333 The TEE target cannot be used either because it's duplicating the packets locally (as per the same thread). Nov 23, 2019 · Personally, I think I'd make your mirroring port part of the WAN VLAN - and then configure "port mirroring" on the swconfig level. 0 -t mangle -A POSTROUTING -j TEE --gateway 192. 15 on your router (say, 192. 147 > iptables -s 0. 2: Jul 17, 2023 · Hey all, Trying to get into using nftables with the latest OpenWrt version. Jump to: You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in Note: There are often limitations to port mirroring as the switch hardware in many platforms may not connect directly to all interfaces - this means that you might only be able to mirror LAN or WAN traffic. 99) to internet to a testing box (ubuntu 192. 10 (not flexible solution: will clone a packet and redirect this clone to another machine on the local network segment, in other words, can not route cloned packet (but in worst case, I can try to adopt Mar 9, 2018 · iptables -t mangle -A POSTROUTING -j TEE --gateway <monitoring ip> But so far I see no traffic flowing over any interface to the monitoring ip unless I try to ping it directly (of which then I can see the traffic on both bridge and monitoring port). The document serves as a practical guide for network analytics using Trisul Network Analytics tools. 14 --tee Apr 8, 2024 · 文章浏览阅读4. alternatively you can filter for the source or target devices by adding options to the iptables commands above. May 5, 2022 · option target 'eth1' # interface or IP address to send packets to option protocol 'TEE' # 'TEE' iptables (default) or 'TZSP' TaZmen Sniffer Protocol option filter '' # optional tcpdump/libpcap packet filter expressions two win virtual machines can get ip through openwrt and access the Internet, but the mirroring fails, May 5, 2022 · option target 'eth1' # interface or IP address to send packets to option protocol 'TEE' # 'TEE' iptables (default) or 'TZSP' TaZmen Sniffer Protocol option filter '' # optional tcpdump/libpcap packet filter expressions two win virtual machines can get ip through openwrt and access the Internet, but the mirroring fails, May 25, 2024 · Hi all, I have tried port mirroring in my router which has OpenWRT 21. Dec 16, 2014 · Try `iptables -h' or 'iptables --help' for more information. The usual use of port mirroring is to monitor the packets going via a particular interface without actively taking part in the network protocol. 7, and I guess you'll need to patch and rebuild RPM. Do I need to be on port 1 and everyone else off a switch from port 2? On my server, I want to duplicate all the traffic to an other host. Is this possible with OpenWrt, and if so, how. Port Mirroring is used to send a copy of packet to destination which was received on the interface depending on the configuration. wunderground. First of all you need an OpenWRT compatible router Jan 17, 2016 · This simple tutorial describes how to configure traffic mirroring on your OpenWRT capable router (using iptables) and send it to Snort IDS. 3_2 SPAN / port mirroring not working # iptables -t mangle -A PREROUTING -j ROUTE --gw 192. 20. Hi, I'm planning on running an IDS on a VM connected to a vm-bridge via a lan-port on the OpenWrt. 2 -j ROUTE --gw 10. Usually this is done "TEE" is an iptables routing target. 103 is SEQ box # works, but EVERYTHING on the network gets mirrored to my SEQ box-- overkill iptables -A PREROUTING -t mangle -j ROUTE --gw 192. 147 > > where the 192. 1). Regards, Vieri View entire thread SourceForge Jul 25, 2020 · Setup Port Mirroring/ No option to disable NAT Acceleration on RT-AX88U (Merlin 384. 0 -t mangle -A PREROUTING -j TEE --gateway 192. My starting point has been the related topics in this forum (thanks!). 1' # interfaces (maximum of 4) to copy packets from option promiscuous '1' # put source interface(s) in promiscuous mode option target 'eth0. 2. 250. So I wrote a port-mirroring program based on libpcap. 2 and I am using it on an ASUS RT-AC68R Router. Jan 26, 2018 · In my test (4. Is iptables TEE a possible solution? Any advice? How-to: Compile TEE module for port mirroring (for R7000P). But you should be able to setup some iptables rules (as desicribed above) to redirect/mirror that remaining traffic. Therefore, you can not get the original source and destination mac addresses. ) Do port-mirroring on the client so that any traffic on the client port gets copied to another port say X. As such, the dev server I am attempting to set up port mirroring via the iptables TEE target in order to capture all traffic from a host. Followed a thread of RT-AC66U and here, but could not get it work. This article outlines the steps for configuring Port Mirroring using iptables commands to capture both inbound and outbound traffic. Since Linux kernel 4. From the manpage, I don't think the mirror option in iptables is what I'm looking for. 15 kernel), using TEE in PREROUTING causes no change in the packet (source or destination) and thus when you specify any localhost address as the gateway, creates a feedback loop (50Gbps on my machine) Are you trying to split incoming traffic to hit two ports or take the output of one port and tie it to the input of another? If the former, there are really two steps. 1 We use the TEE target of the mangle table to clone the incoming UDP packets on port 12201 (Graylog's UDP port) and redirect it to the local loopback address. Also, the target host must be in the same subnet as the mirroring source. Just pick a unique, static IP address. 4' # interface or IP address to send packets to Mar 4, 2021 · Note the skip_sw flag, meaning this command will not fall back on mirroring via the CPU if the hardware offload fails tc filter add dev $ {sniffPort} ingress matchall skip_sw action mirred egress mirror dev $ {mirrorPort} #Mirror all packets going out of snifPort (egress) to mirrorPort tc filter add dev $ {sniffPort} egress matchall skip_sw Oct 17, 2017 · Port Mirroring (IPv4) Using the iptables ' TEE extension, port mirroring is an easy feat. I have tested the following 2 iptables commands with *all* of the DD-WRT v24-SP2 firmware builds/versions from the year 2011 to the year 2014 but still cannot get port mirroring to work. 168. Sep 30, 2021 · Model: Asus RT-AX56U v1 Asuswrt-Merlin: 386. "-iptables -I PREROUTING -t mangle -j ROUTE --gw (Ip-of-your-IDS) --tee -iptables -I POSTROUTING -t mangle -j ROUTE --gw (IP-of-your-IDS) --tee" Any information or direction to finding the information would be helpful. 16. You can't use tee to get a copy of the packet AND mangle the packet to change the port numbers at the same time. My management interface on my SO VM is 192. 10 (not flexible solution: will clone a packet and redirect this clone to another machine on the local network segment, in other words, can not route cloned packet (but in worst case, I can try to adopt May 24, 2013 · Thus I have a two-fold problem : 1. Feb 8, 2022 · hello i usually use iptables tee to do port mirroring but with the firewall4 we no longer have the option to add the customs rules how to perform port mirroring in fw4 the usual command is this iptables -A POSTROUTIN&hellip; Jan 29, 2014 · iptables - DNAT does only forward the traffic, but does not pass it to the local webserver iptables - TEE does only duplicate to servers in the local network -> the servers are not located in the same network due to the structure of the datacenter May 25, 2024 · How to implement Traffic monitoring (with iptables, port mirroring, etc) - Page 2 - Installing and Using OpenWrt - OpenWrt Forum Network traffic capture problem on AR750 Mirroring traffic with iptables TEE target Aaron Lewis 12 years ago Hi, I tried to mirror TCP traffic with mangle chain, that all packets sent to 192. # 192. Aug 4, 2022 · iptables -A POSTROUTING -t mangle -s iptomirror -j ROUTE --gw iptosendto --tee However, these rules don't work for all of the LAN<->LAN traffic of iptomirror where in my case all of this traffic is all happening over the single 4-port switch of the RT-AC68U. Unfortunately failing to get results :( Can you help? Running these commands on AsusWrt (RT-AC68U on Merlin 384. Intrusion detection systems, network application debugging, and network performance monitoring are common use cases. However, tcpdump -e vlan does not seem to show any vlan information on the "gateway". Mar 5, 2022 · I had this kind issue before. 0. I kept openwrt使用port-mirroring，代码先锋网，一个为软件开发程序员提供代码片段和技术文章聚合的网站。 Jan 21, 2011 · Mirroring is what is sometimes referred to as Switch Port Analyzer (SPAN) and is commonly used to analyze and/or debug flows. Since I want my application to continue communicating and port X to simply be a passive sniffer I resorted to the -j TEE to duplicate the packets. Linux iptables: iptables -t mangle -A PREROUTING -i br0 -m addrtype --dst-type BROADCAST -p udp -m udp --dport 475 -j TEE --gateway 172. Use libpcap to do the mirroring - libpcap-based port-mirroring project . 1, but i could not see any mirrored packets from eth0. But I dont how to remove that rule. 3 xxx@xxx:~# iptables -t mangle -A PREROUTING -j ROUTE --tee --gw 192. I can check the code and offer a solution if you wish. 1 -J TEE --gateway 12. From what I've found trying to DNAT the packet created by TEE can work, but I have had 0 luck reproducing. Oct 14, 2020 · This article provides the steps for configuring Port Mirroring with suitable commands. 156 And I I would also prefer to see the VLAN ID info. For best results, please use a tap or span port that doesn't rely on iptables TEE: Feb 4, 2010 · I enabled monitoring for that port using so monitor add and the ip assigned for that port went away which prevents me from doing port mirroring with my asus merlin using: modprobe xt_TEE iptables -t mangle -A PREROUTING -j TEE --gateway iptables -t mangle -A POSTROUTING -j TEE --gateway Am i going about this the wrong way? You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum Linux iptables: iptables -t mangle -A PREROUTING -i br0 -m addrtype --dst-type BROADCAST -p udp -m udp --dport 475 -j TEE --gateway 172. Jan 31, 2019 · iptables -A POSTROUTING -t mangle -o br-lan -j TEE --gateway $ {receiver} iptables -A PREROUTING -t mangle -i br-lan -j TEE --gateway $ {receiver} this will forward ALL packets to the receiver ip where you can filter them with wireshark. Apr 26, 2016 · 1 I don't have much knowledge on iptables. 1 But on 192. See full list on github. TL;DR I’m trying to capture traffic my PS3 both receives and sends. 4 EDIT: on CentOS 6. 2 is the monitoring box. 1 --tee iptables -t mangle -A POSTROUTING -p tcp --source 10. r28072 build - Mirroring - Issue due to old Iptables version DD-WRT Forum Index -> X86 based Hardware You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum Aug 9, 2016 · How to port mirror on your Asus router using asus-merlin custom firmware. Passing the TCP packets to applications on port 80 and 8080 requires the there are two target TCP endpoints talking back to a single source TCP endpoint. Oct 28, 2012 · You can use -j TEE in iptables to mirror but this really is for packet sniffing or UDP only. "TZSP" encapsulates a whole packet and forwards Jul 5, 2009 · Hello, I have a dd-wrt based router and I'm using iptables to mirror EQ traffic to my SEQ box. 2: Oct 18, 2018 · Next, assign an IP to the system that will receive the monitoring packets. 103 --tee iptables You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum Jul 29, 2021 · Does this tee the traffic to both gateways or only the 1st rule? running the command iptables -L -v shows the rules and packets getting counted against the rule. Setup the TEE modules with iptables (when you're ready to make these permanent, add them to /etc/firewall 嗨，如果有其他解决方案的话，我更倾向于使用它，因为我不想在我的固件项目中使用 autotools 来更新 iptables 或 kernel，这可能会破坏当前的开发进程。我考虑使用 port-mirroring project，但我希望能够复制每个出站数据包（具有超出局域网的目标IP的数据包），而不仅仅是选择的接口上的一个。 - MABC Sep 1, 2024 · 本文详细介绍了在OpenWrt系统中如何安装和配置Port-Mirroring功能，通过设置源端口和目标IP，实现网络流量的镜像传输。文章提供了具体的配置文件路径和命令，以及如何修改配置文件以改变源端口和目标地址。同时，提到了几种可用于分析网络包的软件，如WFilter、科来分析软件和Wireshark。 Port mirroring takes all packets passing through designated ports on a switch, clones them and routes the copies either to a specific port on the switch, or, in the case of iptables TEE target, sends them out of the port where its MAC table says the listening IP corresponding to the --gateway argument is. I’m trying to mirror any packets that go to an IP address to another IP address. 2 I executed, iptables -A PREROUTING -p tcp --dport 80 -j TEE --gateway 192. For the sake of the examples below, 172. com). I wonder if there is another way (maybe using iproute2 or ebtables) to copy every linux iptables routing mirroring MABC 203 modified Sep 16, 2013 at 10:52 1 Sep 3, 2025 · config 'port-mirroring' option source_ports 'xxxxx' # interfaces (maximum of 4) to copy packets from option promiscuous '1' # put source interface(s) in promiscuous mode option target '192. 02. 147 IP address was the management interface Apr 26, 2016 · 1 I don't have much knowledge on iptables. 56. The reason I switched the firmware to ddwrt was that I can do "port mirroring" through iptables cloning and forwarding. . I had been mirroring traffic from my router with OpenWrt via iptables to a VM running Suricata in promiscuous mode with these rules: iptables-translate -i eth0 -t mangle -A PREROUTING -s 0/0 -j TEE --gateway 192. I consider using port-mirroring project but i want I want to copy every outgoing packet (packet wiht ip destination out of LAN) not only one+ selected interfaces. 1 no traffic to port 80 was seen Aug 14, 2024 · Planning to do port mirroring to a rasberry pi connected to Lan port of AX86U. Send the cloned packet to a host on the new cluster Jul 1, 2018 · My IPTables version is v1. Based on the question, I figured mirror really meant redirect. Finally, does shorewall "support" TEE in some way? Or port mirroring in any other way? I haven't found any relevant documentation regarding this topic, yet. With port mirror you can set up IDS or spy on people. My intention is to capture (mirror) all traffic from one host (RPi 192. 0/24 -j TEE --gateway 192. Iptables simply modifies the ethernet header of the original packets to the target host's MAC address. You may want to use this feature to copy selected traffic from the local system to a remote host for further inspection. With this feature, you can deploy monitoring easily when you have an embed Linux gateway or bridge. The commands I used: iptables -t mangle -A PREROUTING -p tcp --source 10. 11_2): modprobe xt_TEE Aug 24, 2017 · When it is necessary to monitor mobile device traffic and capture network traces with Wireshark, iptables-mod-tee library allows network router to mirror all traffic from a specific Client (for example, a mobile device) to another host. 3, you can duplicate packets to another IPv4 or IPv6 destination address. 1, # On 192. Dec 24, 2019 · Iptables/Netfilter - Mirroring traffic with Iptables (the TEE Target) Andrei Dumitrescu 6. 200. Usually this is done with iptables -tee command affecting the 'mangle' table for PREROUTING and POSTROUTING chains, to clone incoming and outgoing packets. EDIT: Problem is a little bit more complicated. Any ideas on being able to observe wireless-to-wireless traffic? Seems odd that I can see this traffic when running tcpdump on the router's br-lan interface but can't see it when using the iptables -TEE Mar 6, 2015 · Anyone know how this is done, need port mirroring so i can run a filtering program. 12 This will copy the incoming packets to UDP port 60000 to the IP set in --gateway. Jun 12, 2022 · I am looking of other ways, where I could "mirror" only part of the traffic (LAN and WLAN, so duplicating br0 to either one port or one address) @Voxel is there a way to implement the ROUTE or TEE kernel module for iptables (netfilter) in your firmwares? I don't think they are present. It is all firmware based :) The commands:"iptables -I PREROUTING -t mangle -j R Jump to: You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in Jun 1, 2016 · Port mirroring? DD-WRT Forum Index -> Broadcom SoC based Hardware How-to: Compile TEE module for port mirroring (for R7000P) Oct 18, 2018 · Next, assign an IP to the system that will receive the monitoring packets. We just need rules for mirroring any incoming traffic destined towards the LAN network, and any outgoing traffic originating from the same network towards the WAN interface. but is there any way in IPTables or in some other tool in the DD-WRT firmware to create a spanning/mirror port? i want to duplicate all traffic coming in on the WAN port to one of the May 20, 2025 · config 'port-mirroring' option source_ports 'wan' # interfaces (maximum of 4) to copy packets from option promiscuous '1' # put source interface (s) in promiscuous mode option target 'lan5' # interface or IP address to send packets to option protocol 'TEE' # 'TEE' iptables (default) or 'TZSP' TaZmen S option filter '' # optional tcpdump/libpcap Jan 2, 2018 · I don't have a switch with SPAN ports, or a network tap so I'm using OpenWRT in combination w/ iptables mirroring functionality via --tee. 4 Configuration: config 'port-mirroring' option source_ports 'eth0. It's really hard to get iptables TEE target working in openwrt. The main goal is to copy all traffic for service on server A (port 1935) to same service running on server B on same port (port 19 Jun 29, 2010 · Port mirroring? DD-WRT Forum Index -> Broadcom SoC based Hardware DD-WRT Forum Index -> Broadcom SoC based Hardware All times are GMT Navigation Hello, I have a dd-wrt based router and I'm using iptables to mirror EQ traffic to my SEQ box. GitHub Gist: instantly share code, notes, and snippets. 4K subscribers Subscribed 2 i want to mirror specific traffic to ip 192. Having an IDS running in your local network sometimes can help find infected machines connected to it, LAN attacks which can lead to sessions hijacking, Man-in-the-middle attacks and other nasty things. Therefore I started to try use iptables to configure (port) mirroring. I have tried iptables for the same. The way i have done it before is to mirror all traffic to the IDS. These are the 2 commands I attempt to use. 103 --tee iptables Sep 23, 2023 · Every time I make the changes the router reboots and the change is lost. 12. It allows you to forward packets to another host. 78 iptabes -I PREROUTING -t mangle ! -s 127. I googled the port mirrioring with iptables iptables -t mangle -I PREROUTING -j TEE --gateway 10. Bad argument `–tee' Try `iptables -h' or 'iptables --help' for more information. To Reproduce ssh into the ro Jul 9, 2019 · Thanks @lleachii! My wired clients can all be connected to a downstream 48-port switch with a mirror port setup, so I can drop my requirement to perform port mirroring on the OpenWrt router. 3. 2 would be copied to 192. Dec 2, 2022 · config 'port-mirroring' option source_ports 'eth1' # interfaces (maximum of 4) to copy packets from option promiscuous '1' # put source Afaik it ArcherC7 stock firmware doesn't have port mirroring. 1 For that version of iptables -j ROUTE doesn't work. Used a RT-66U in this guide. and redirect to a spying pc Sep 10, 2010 · We're using a 3. May 24, 2013 · Thus I have a two-fold problem : 1. For best results, please use a tap or span port that doesn't rely on iptables TEE: Feb 4, 2010 · I enabled monitoring for that port using so monitor add and the ip assigned for that port went away which prevents me from doing port mirroring with my asus merlin using: modprobe xt_TEE iptables -t mangle -A PREROUTING -j TEE --gateway iptables -t mangle -A POSTROUTING -j TEE --gateway Am i going about this the wrong way? Linux iptables: iptables -t mangle -A PREROUTING -i br0 -m addrtype --dst-type BROADCAST -p udp -m udp --dport 475 -j TEE --gateway 172. TEE was added in 1. I'm using the following iptables routes, added via SSL to OpenWRT, and verified in the status -> firewall web UI. I am looking for a build that either has the iptables_mod_tee built in or will allow it to be installed via Entware . Take in account that the gateway should be in the same network, if don't , the rule won't work unless you do something Port mirroring takes all packets passing through designated ports on a switch, clones them and routes the copies either to a specific port on the switch, or, in the case of iptables TEE target, sends them out of the port where its MAC table says the listening IP corresponding to the --gateway argument is. Jan 4, 2012 · Try: iptables -t mangle -A PREROUTING -j TEE --gateway 192. 100). I need to mirror the UDP packets to an external host. Copy/Mirror traffic to WAN interfaces without "iptables tee" support I want to copy every outgoing packet to others WAN interfaces but my iptables (v1. Is it possible achieve traffic mirroring without tee extension somehow? I have a configured openwrt router in live environment and don't want to spend another day to configure it again after flashing a new build. There are no obvious gaps in this topic, but there may still be some posts missing at the end. Intrusion detection systems, network application debugging, and port-mirroring is an OpenWrt package that sends copies of network packets from your OpenWrt router to another device on your network or beyond, giving you the ability to monitor and analyze network traffic without additional hardware. 4. No need for a hub or special vlan He's saying using iptables he's not saying using a simple kernel module or switch port mirroring. 100/24. Jan 31, 2023 · Router Model Affected RT-AX82U Firmware Version Affected 388. 1. Search for iptables-mod-tee and install Go to Networking\Switch Enable mirroring of incoming packets checkbox Enable mirroring of outgoing packets checkbox Set the Mirror source port to your EQ computer lan port Set the Mirror monitor port to your ShowEQ computer lan port Click Save & Apply Click System\Reboot\Perform reboot Oct 28, 2014 · Nous allons voir comment mettre en place un port mirroring sous Linux en utilisant l'outil de gestion du pare-feu netfilter : iptables Okay, I've got the traffic from one IP to mirror to another, but the source machine does not get any replies. I setup an isolated VLAN on my router, but that's not necessary. com Jan 10, 2020 · My intention is to capture (mirror) all traffic from one host (RPi 192. 1_0-gnuton1 Is this bug present in upstream Merlin releases too? No Describe the bug Router freezes when traffic mirroring is enabled via iptables. It looks like you have 2 options: Use the ROUTE target from patch-o-matic which does have a --tee option for iptables. 0 kernel on an Ubuntu 12. 78 Unfortunately by adding these rules a high CPU May 1, 2013 · Pass-by mode: set up a mirroring port in your switch/router, and connect WFilter computer to the mirroring port to do monitoring/filtering.