[c-nsp] Cisco Processing Regarding ICMP

Gert Doering gert at greenie.muc.de
Sun May 11 11:58:01 EDT 2008


Hi,

On Sat, May 10, 2008 at 03:39:23PM -0500, alaerte.vidali at nsn.com wrote:
> Because internal network design requirements, it is necessary decrease
> internal MTU to slight lower than 1500 bytes, 

Ugh.

This is *really* unusual.  Many networks increase their MTU to well
above 1500, so that even tunneled connections still are able to carry
full-MTU packets - but running a network below 1500 sounds like a 
Really Bad Plan to me.  

Expect fun with all the sites out there that have Issues with PMTUD.  Lots.

gert
-- 
USENET is *not* the non-clickable part of WWW!
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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