[66012] in North American Network Operators' Group
Re: Minimum Internet MTU
daemon@ATHENA.MIT.EDU (bill)
Mon Dec 22 08:27:57 2003
From: bill <bmanning@karoshi.com>
To: cbrenton@chrisbrenton.org (Chris Brenton)
Date: Mon, 22 Dec 2003 05:27:13 -0800 (PST)
Cc: nanog@merit.edu (nanog)
In-Reply-To: <1072097368.2076.336.camel@grendel> from "Chris Brenton" at Dec 22, 2003 07:49:29 AM
Errors-To: owner-nanog-outgoing@merit.edu
>
>
> A few years back I noted some 512-536 MTU links in ASIA. I've been doing
> some testing and can't seem to find them anymore. Is is safe to assume
> that 99.9% of the Internet is running on 1500 MTU or higher these days?
define safe.
> I know some people artificially set their end point MTU a bit lower
> (like 1400) to deal with things like having their traffic encapsulated
> by GRE or IPSec. With this in mind, would we be safe to flag/drop/what
> ever all fragments smaller than 1200 bytes that are not last fragments
> (i.e., more fragments is still set)? Does anyone maintain, or is aware,
> of links that would not meet this 1200 MTU?
now that you mention it... :)
btw, what will your IDS/firewall do when presented w/ a 9k mtu?
>
> Any and all feedback would be greatly appreciated,
> C
>
>
