tantan un jour écrivit:
Hello, to know someone from using a packet generator?
tcpreplay allow you to send specific packets from a file, including invalid ones AFAIK. Since you can alter the packets, it can be useful for testing the application when receiving bad data like a string that is one bit too short or other limit conditions.
There is some tricks to intercept the packets in the fly and mangle them a little before resending them.
http://tcpreplay.synfin.net/trac/wiki/manual tcpcat can also sometime proves useful.If all you use is a tcp/ip connection and the protocol is text based, like SMTP, a script in Perl, Python or even some Shell script (note that in Debian, this is disabled by default in Bash) could be the easiest solution for you.
I'd like to create packages in-house design, and then send it. The goal is to analyze communication between two partners, so down to the smallest possible Detail.
So, you don't really want a packet generator. Here the good old tcpdump will be your friend. Snort might also be useful in some situation where there is many servers involved and you want to remove all regular packets and gets only the problematic ones. There is plenty of good tutorial for both.
Simon