Date: Sat, 2 Feb 2002 12:53:02 -0800 From: "Crist J. Clark" <cristjc@earthlink.net> To: "R.P. Aditya" <aditya@grot.org> Cc: "Rogier R. Mulhuijzen" <drwilco@drwilco.net>, Shaun Jurrens <shaun@shamz.net>, freebsd-net@FreeBSD.ORG, Alexey Luckyanchikov <alexl@alkar.net> Subject: Re: Weird path MTU autodiscovery problem in 4.5-RELEASE Message-ID: <20020202125301.E1280@gohan.cjclark.org> In-Reply-To: <20020202200729.GA22083@mighty.grot.org>; from aditya@grot.org on Sat, Feb 02, 2002 at 12:07:29PM -0800 References: <20020202191943.B65253@atreides.freenix.no> <5.1.0.14.0.20020202202155.01b9e390@mail.drwilco.net> <20020202200729.GA22083@mighty.grot.org>
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On Sat, Feb 02, 2002 at 12:07:29PM -0800, R.P. Aditya wrote:
> On Sat, Feb 02, 2002 at 08:32:49PM +0100, Rogier R. Mulhuijzen wrote:
> > ICMP is an IP protocol, if the very first rule in IPFW is 'allow ip from
> > any to any' then ICMP is allowed.
>
> uh, that might be ipfw-speak (I don't use or pretend to know ipfw) but ICMP is
> NOT "part" of IP (that would defeat the whole purpose of using it as a control
> protocol for IP).
It sure is an IP protocol.
> Look at /etc/protocols:
>
> ip 0 IP # internet protocol, pseudo protocol number
> icmp 1 ICMP # internet control message protocol
And what does it say at the top of /etc/protocols?
# Internet protocols
All of the protocols on that list are different protocols you can run
over the Internet Protocol (IP).
Not only that, but ICMP _is_ also part of IP in the sense that any
compliant IP implementation must understand ICMP.
--
Crist J. Clark | cjclark@alum.mit.edu
| cjclark@jhu.edu
http://people.freebsd.org/~cjc/ | cjc@freebsd.org
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