North American Network Operators Group
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Re: Minimum Internet MTU

  • From: bill
  • Date: Mon Dec 22 08:29:44 2003 
> 
> 
> 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
> 
>