Date: Mon, 18 Mar 2002 13:07:38 -0800 From: Eli Dart <dart@nersc.gov> To: "Peter Brezny" <pbrezny@purplecat.net> Cc: freebsd-net@FreeBSD.ORG Subject: Re: icmp 5 Message-ID: <20020318210738.24C2B3B1AB@gemini.nersc.gov> In-Reply-To: Message from "Peter Brezny" <pbrezny@purplecat.net> of "Mon, 18 Mar 2002 14:33:34 EST." <HDEBKOFAJCKIJIDMEINCKEBFELAA.pbrezny@purplecat.net>
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--==_Exmh_-1981109936P Content-Type: text/plain; charset=us-ascii less /usr/include/netinet/ip_icmp.h The stuff that I think you want starts around line 135. Looking at a copy of Stevens TCP/IP Illustrated vol. 1 might also help, but I always just read the header file to find out what's what. --eli In reply to "Peter Brezny" <pbrezny@purplecat.net> : > Hi Everyone, > > Where can i find an explanation of the different icmp types. > > I ran across some standard firewall rulesets that say these types are > required: > # Allow required ICMP > $fwcmd add allow icmp from any to any icmptypes 3,4,11,12 keep-state > > And now I've got a cisco router that's wanting a response from an icmp type > 5. > > What is type 5 for, and where can i get some more info on the different > types in an icmp packet. > > Well, I just partly answered my question with a quick google search for icmp > type > > http://www.iana.org/assignments/icmp-parameters > > > However, I'm still needing some more info. Why would my router be sending > redirect ICMP info to this host? > > And are the required ICMP types in the firewall rule above really adequate? > > Here's what's showing up in the system report: > > ipfw: 65435 Deny ICMP:5.0 router.ip.address host.ip.adress in via xl0 > > Where the host has only the following icmp types allowed. > > # Allow required ICMP > $fwcmd add allow icmp from any to any icmptypes 3,4,11,12 keep-state > > Thanks, > > Peter Brezny > purplecat.net > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message --==_Exmh_-1981109936P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: This is a comment. iD8DBQE8llcaLTFEeF+CsrMRAprpAKDiV+B5ACaCKeKwN8RRs3Apk9pskACfUPvs 7t3ELaDQV2Lw2UwU2DLJud8= =8nVP -----END PGP SIGNATURE----- --==_Exmh_-1981109936P-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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