Linux – Bootable image with LAN drivers

bootablelinuxnetworking

I'm looking for an image which will boot quickly (I assume it'll be linux) and have LAN drivers- for sending TCP / UDP packets to another system in the same network.
Ideally, if possible, I would like to have an image with a parameter – the destination address for sending the packets but otherwise I'll just send – broadcast.
what tools / types/ OS would suit this situation?

Best Answer

Any live Linux distribution will work just fine for this.

Ubuntu has a fancy GUI.
SystemRescueCD comes with many system repair tools, including networking tools.
BackTrack is targetted at penetration testing, so it comes with a lot of networking tools, especially for network inspection and packet injection.

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Linux – Why are incoming packets on a TAP interface seen with tcpdump but not with iptables

Here is further guesswork. Hope this is helpful, but it may as well be embarassingly wrong.

tap0 has two ends, the kernel network stack end and the program interface. It seems to me if you supply 'nicserver' with tap0, it won't attach to it the way it is intended with tap devices, using the program interface. Instead, nicserver will simply write to it from the network stack end, and with no application reading from the program interface end, you will end up overflowing the device queue. This explains the dropped packets. Also, no packets will be delivered, which might explain the iptables result.

I guess if you let tcpdump capture on tap0 it actually attaches to the program interface end of tap0 and, voila, you see the packets. I searched the internet but found no source to confirm such behaviour. To falsify this theory, capture tap0 and see how it affects packet drops and the iptables log.

Finally, an advice that addresses your original problem: what about using the loopback device, instead? Like so:

nicserver -p 7801 -a lo

Best Answer

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Linux – Why are incoming packets on a TAP interface seen with tcpdump but not with iptables

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