www.arin.net

[Nick Hilliard]

> PMTUD problems aren't caused by any particular MTU, but by the source  
> host not seeing "packet too big" messages. If you remove this router  
> and use one that allows for a bigger MTU the problem will simply  
> resurface once packets hit another link with a smaller MTU.

This is true, but it's also true that having links with MTU < 1500 tends
to cause trouble.  Of course, in a perfect world, you could run at any
MTU you cared for, but we don't live in that world.

Nick