Firewall Wizards mailing list archives

Re: RE: Sniffing out a firewall problem


From: Gregory Hicks <ghicks () cadence com>
Date: Sun, 4 Nov 2001 06:38:36 -0800 (PST)


From: Ryan Russell <ryan () securityfocus com>
Date: Sat, 3 Nov 2001 21:38:39 -0700 (MST)

On Sat, 3 Nov 2001, Peter Lukas wrote:

You'll get some pretty useful stats. Typically, any system with
Ierrs, Oerrs or Collis will be experiencing a problem. Check caples,
duplex settings and of course, the card /switch port itself.

Please be careful about making blanket statements about collisions
automatically meaning problems.  On any connection that is supposed
to be half-duplex Ethernet-style, collisions are perfectly normal, and
you have to measure collisions against total traffic to even have a
rudimentary problem measurement.

Half duplex?  If the ratio of coll/total is 2% or less, Great!  More
than 10%?  You've got a problem.


Sorry, it's a pet peeve of mine.  When I used to be primarily a

I still get this.

Regards,
Gregory Hicks
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