Date: Fri, 24 Jan 2003 12:28:53 -0800 From: Eli Dart <dart@nersc.gov> To: Luigi Rizzo <rizzo@icir.org> Cc: Josh Brooks <user@mail.econolodgetulsa.com>, freebsd-net@FreeBSD.ORG Subject: Re: catching bad ICMP errors - very odd Message-ID: <20030124202853.E42E13B1AE@gemini.nersc.gov> In-Reply-To: Message from Luigi Rizzo <rizzo@icir.org> of "Fri, 24 Jan 2003 10:07:14 PST." <20030124100714.B14895@xorpc.icir.org>
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--==_Exmh_-1729541048P Content-Type: text/plain; charset=us-ascii In reply to Luigi Rizzo <rizzo@icir.org> : > 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 Are you sure tcpdump is attaching to the correct interface? --eli > > > > 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 --==_Exmh_-1729541048P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: This is a comment. iD8DBQE+MaIFLTFEeF+CsrMRAqxBAJ4u0fWjf7EazS52svFkqBNTbXBiEwCg3+sB TDM2s3UvBbTvye9JpEEMEhQ= =Cdwl -----END PGP SIGNATURE----- --==_Exmh_-1729541048P-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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