North American Network Operators Group

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Re: mtu mis-match

  • From: Michael Holstein
  • Date: Thu Mar 20 11:37:13 2008

but I still don't know why mtu can cause this problem

Blocking ICMP (specifically type 3,code 4) can also cause this .. because it breaks path MTU discovery (pmtud).

The first part of this doc helps explain the issue :


Michael Holstein
Cleveland State University