From: "Miquel van Smoorenburg" <miquels@cistron.nl>
To: linux-kernel@vger.kernel.org
Subject: Re: connectivity to bkbits.net?
Date: Thu, 28 Nov 2002 23:59:24 +0000 (UTC) [thread overview]
Message-ID: <as6aks$amj$1@ncc1701.cistron.net> (raw)
In-Reply-To: 20021128211347.D27234@flint.arm.linux.org.uk
In article <20021128211347.D27234@flint.arm.linux.org.uk>,
Russell King <rmk@arm.linux.org.uk> wrote:
>On Thu, Nov 28, 2002 at 06:53:00PM +0200, Kai Henningsen wrote:
>> >From two or three traceroutes, that problem seems to be at the SGI end. I
>> can't get to them either (nothing after the same IP as for you, at hop
>> #17, some place at Genuity), but you are practically next door.
>
>Lesson #1 of firewalling: drop everything.
>Lesson #2 of firewalling: only accept what you absolutely have to.
Lesson#3 of firewalling: due to #1 and #2 most admins block
ICMP_UNREACH_NEEDFRAG as well (ICMP == ping == bad) breaking
path MTUd. http://alive.znep.com/~marcs/mtu/
Note that IPv6 has no fragmentation and pMTUd is mandatory.
Oh joy.
Mike.
--
They all laughed when I said I wanted to build a joke-telling machine.
Well, I showed them! Nobody's laughing *now*! -- acesteves@clix.pt
next prev parent reply other threads:[~2002-11-28 23:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-28 16:25 connectivity to bkbits.net? Larry McVoy
2002-11-28 16:53 ` Kai Henningsen
2002-11-28 21:13 ` Russell King
2002-11-28 23:59 ` Miquel van Smoorenburg [this message]
2002-11-29 6:55 ` Kai Henningsen
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