Using the ASUS-RT-N16 router, you can manage getting tcpdump via EnDevour WRT. Here's a detailed guide on how to run tcpdump and capture UDP traffic using the router.
Prerequisites
- Ensure your router's firmware supports tcpdump.
- SSH access to the router is required.
Running tcpdump (Router)
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Connect to your router via SSH.
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Install tcpdump if it's not already installed:
opkg update opkg install tcpdump -
Run tcpdump with the following command to capture UDP traffic:
tcpdump -i br0 -vvv -X udptcpdump -i br0 -vvv -X udp [br0 bridge]The
-i br0option specifies the interface to monitor. The-vvvoption increases the verbosity level, and the-Xoption enables hexdump and ASCII dump output. Theudpfilter is used to capture only UDP traffic. The[br0 bridge]part should be replaced with the name of your bridge interface if it's not called br0.
Understanding the Output
The output will display various details about the UDP packets, such as source and destination IP addresses, source and destination ports, timestamps, and the packet data. The hexdump and ASCII dump output can help you analyze the packet contents in more detail.
Troubleshooting
If you encounter issues with tcpdump, ensure that you have the correct interface name and that you have the necessary permissions to run tcpdump. You can also refer to the tcpdump manual for more information on options and filters.
References