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[FW-1] Network performance analysis / sniffing.
I'm hoping someone can help me with something that's only partly
firewall related. At times, the external interface of firewalls I'm
responsible for will become highly utilized. In going down the path of
looking for upgrades, management invariably asks the question, "What sort of
traffic is this interface passing?" Obviously, I can tell what traffic is
allowed by looking at my firewall rulebase and logs. What's more difficult,
is to tell how much of each type of traffic is allowed.
For example, I can presume that HTTP and SMTP are two of the major
protocols in use on my network. However, I can't reliably state the HTTP
accounts for X% of total utilization while SMTP accounts for Y%. And
therein lies my question. Does anyone know of a relatively simple way to
collect these sorts of statistics? My first thoughts are to possibly i) run
a sniffer near my firewall, and analyze it's captured data in order to
generate these statistics. My second thought is that maybe the firewall
logs already contain most of the information I'm looking for. What sorts of
solutions have other people implemented to answer these sorts of questions?
Any and all ideas are appreciated greatly.
Jeff Jarmoc - CCSA, CCNA, MCSE
Network Analyst - Grubb & Ellis
[email protected]
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