[137238] in North American Network Operators' Group
Re: Too bigs are sacred, was: Re: IPv6 addressing for core network
daemon@ATHENA.MIT.EDU (Iljitsch van Beijnum)
Thu Feb 10 06:58:16 2011
From: Iljitsch van Beijnum <iljitsch@muada.com>
In-Reply-To: <C978D336.4BD24%david.freedman@uk.clara.net>
Date: Thu, 10 Feb 2011 12:58:02 +0100
To: David Freedman <david.freedman@uk.clara.net>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 10 feb 2011, at 0:26, David Freedman wrote:
>> Unless every packet you emit is =E2=89=A4 the minimum MTU (1280), =
then, you need
>> to be able to receive TOOBIG messages.
> Can you think of a packet type I will emit from my publically numbered
> backbone interface which may solicit a TOOBIG that I'll have to care =
about?
What if you're trying to connect to your routers with 1500-byte+ POS, =
ATM, ethernet jumbo or what have you interfaces from some system with a =
big fat jumboframe MTU but some 100 Mbps ethernet firewall or office =
network in the middle?
If you're willing to accept TCP or UDP from somewhere, it's a bad idea =
to filter ICMP coming in from that same place.=
