traffic graphing/monitoring

[Arie Kachler]

Hello,

We are looking for a software that will graph and save history for all 
traffic flows that go through our network.
Basically we are replacing a couple of Packeteer devices because they 
are no longer supported and we don't want to spend the huge amount of 
money they are asking for all new equipment.
I know Packeteer is mostly for bandwidth management, but we already have 
that part covered.
What we do not have a solution yet, and Packeteer does, is the 
graphing/monitoring of all traffic going through it.
We don't want to install a piece of software on each server in our 
network that would get polled by SNMP. We know solutions for this type 
of setup exist (cacti, mrtg, etc). We want to sniff all traffic coming 
in and out and graph it over time by IP address.
Does such a software exist?

Any help will be greatly appreciated.

Arie Kachler