Linux or Unix distribution for network sniffing

[Hristiyan Lazarov <hristiyan.lazarov () gmail com>]

Hello, I'm new to this mail list so lets first introduce myself - my
name is Hristiyan Lazarov and I'm currently working as an Enterprise
Security Specialist for a UK based company.

I'm looking to implement in our organisation *NIX based network
sniffer. Basically, I want to trace and record every single packet
that is coming to, or going out from my network.

We are working with sensitive information, that's why my employer want
me to record the traffic at least 1 month back. We have a proxy which
is dealing with our HTTP traffic but some
people are playing smart trying to use some anonymizers to access
restricted websites.

Any suggestions would be greatly appreciated.

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