[j-nsp] MTU Fragmentation

Tom Devries Tom.Devries at rci.rogers.com
Wed Nov 24 09:45:56 EST 2010

Be sure the path through your network supports sending icmp unreachables
from each node so that the source can fragment if need be.  Additionally
firewalls should not be configured to block icmp unreachables, as this
breaks PMTUD.  If customer firewalls block icmp unreachable type four
messages, then you may need a policy to clear the DF bit for that node.
The idea should be that fragmentation is done on the source and not on
the intermediate nodes.






From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Paul Stewart
Sent: November-24-10 9:17 AM
To: 'juniper-nsp'
Subject: [j-nsp] MTU Fragmentation


Hey folks..

For various reasons, we are going to be faced with some MTU challenges
parts of our ongoing Juniper deployments.

We can obtain an MTU right now around 1480 network wide..  This will be
resolved in a year or so we hope but we're in the middle of changes...

My question is the effects of this from an application perspective - we
understand this may add some overhead for fragment processing..

Thoughts? ;)


juniper-nsp mailing list juniper-nsp at puck.nether.net


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