RE: Sniffing out a firewall problem

[aryoung () veros com (Alan Young)]

That is the whole point, when you have 100 plus PC's to manage, I want to
see quickly which IP number is creating all the problem before I spend hours
tearing apart a bunch of machines.

> -----Original Message-----
> From: Thomas Ray [mailto:thomas.ray () tcud state tx us]
> Sent: Friday, November 02, 2001 9:39 AM
> To: firewall-wizards () nfr com; ayoung () veros com; aryoung () veros com
> Subject: RE: Sniffing out a firewall problem
>
>
> There is plenty of sniffer software out there that is free. But if you
> already know which NIC is causing this, why bother sniffing?
> just replace
> the card. that's the fastest way to fix it. if you have
> multiple NIC's in
> the box, replace one at a time until the problem goes away.
>
> if the NIC is giving you a broadcast storm, it's usually
> defective. it could
> also possibly be the patch cable too, so yes, it won't be easy to
> troubleshoot.
>
> how would I trblshoot it?
> -replace all patch cables
>   if the problem goes away, you know the cause
>
> -replace NIC's one at a time
>   if the problem goes away, you know the cause
>
> -if your problem still exists after doing the above, and you
> have a large
> network, it's time to start sniffing if you can't trace the
> problem to a
> specific system
>
> tom
>
>
> > Reply-To: <ayoung () veros com>
> > From: aryoung () veros com (Alan Young)
> > To: <firewall-wizards () nfr com>
> > Date: Wed, 31 Oct 2001 09:46:25 -0800
> > Subject: [fw-wiz] Sniffing out a firewall problem.
> >
> > Hi All
> > We have been experiencing a firewall failure due to a NIC
> card that is
> > apparently chattering and creating an extremely high number of
> > excessive
> > collisions.
> >
> > What is the best way to debug this?
> > We need to install a sniffer program on a PC somewhere, right?
> > I have checked and sniffer software appears to be very expensive?
> > Is there freeware that is available for Win32?
> >
> > This is definitely a job for the wizards.
> >
> > Alan R. Young

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