Date: Fri, 24 Jan 2003 11:05:53 -0800 (PST) From: Josh Brooks <user@mail.econolodgetulsa.com> To: Luigi Rizzo <rizzo@icir.org> Cc: freebsd-net@FreeBSD.ORG Subject: Re: catching bad ICMP errors - very odd Message-ID: <20030124110547.U64423-100000@mail.econolodgetulsa.com> In-Reply-To: <20030124100714.B14895@xorpc.icir.org>
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ipfw1 On Fri, 24 Jan 2003, Luigi Rizzo wrote: > is this with ipfw1 or ipfw2 or both ? > > cheers > luigi > > On Fri, Jan 24, 2003 at 03:56:54AM -0800, Josh Brooks wrote: > > > > I have inserted this ipfw rule, based on guidance from the archives: > > > > count icmp from any to any icmptype 4,5,9,10,12,13,14,15,16,17,18 > > > > Now, I am watching that count rule, and it keeps growing. This means that > > people are sending me packets other than types 0,3,8,11. > > > > So I wanted to see what they were: > > > > tcpdump -vvv -n | grep -v echo | grep -v unreach | grep -v exceeded > > > > and I let that run for hours and hours and hours - and during that time, > > the counter continued to grow and grow, but my screen where I was running > > tcpdump stayed blank - I never saw a single packet. > > > > So how is it that the counter for the above rule can grow and grow and > > grow, but I never see a single ICMP message that says anything besides > > "echo", "unreach" or "exceeded" ? > > > > thanks. > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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