Re: ICMP Killed me and my machine
From: Cory Vokey (cory.vokey@messagingdirect.com)
Date: 05/31/01
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From: "Cory Vokey" <cory.vokey@messagingdirect.com> To: "Mike Silbersack" <silby@silby.com>, "Liran Dahan" <lirandb@netvision.net.il> Date: Thu, 31 May 2001 15:27:33 -0600
Using tcpdump, find the source I.P address of who's
hitting you and set up a rule using ipfw to block it.
Cory Vokey.
----- Original Message -----
From: "Mike Silbersack" <silby@silby.com>
To: "Liran Dahan" <lirandb@netvision.net.il>
Cc: <freebsd-security@FreeBSD.ORG>
Sent: Thursday, May 31, 2001 3:22 PM
Subject: Re: ICMP Killed me and my machine
>
> On Fri, 1 Jun 2001, Liran Dahan wrote:
>
> > My machines are being attacked over hours and those are the only
messages i found:
> > Jun 1 00:07:30 freebsd /kernel: Limiting icmp unreach response from 710
to 20 packets per second
> > Jun 1 00:05:49 freebsd /kernel: Limiting icmp unreach response from
1092 to 20 packets per second
> > i tonoz of messages like that...
> >
> > I Had Orange light ON - TRAF on my hub
> > But i was down including all my machines..
> >
> > -Liran Dahan- (lirandb@netvision.net.il)
>
> Someone's definitely flooding you. You're going to have to use tcpdump,
> see if you can figure out what's hitting you, and have someone upstream
> filter it. There's probably nothing more you can do on the machines
> themselves.
>
> Mike "Silby" Silbersack
>
>
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