North American Network Operators Group

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RE: MTU path discovery and IPSec

  • From: Arjan Hulsebos
  • Date: Thu Dec 04 13:21:27 2003

Title: RE: MTU path discovery and IPSec

> On Wed, 03 Dec 2003 16:05:39 GMT, [email protected]  said:
> > 1) I assume MTU path discovery has to been in enabled on
> each router in the path in order for it work correctly?!
> Actually, no.  All that's required is that:

You also need an OS that does not set the DF-bit on every packet it sends out. IIRC, out-of-the-box Solaris 8 is excellent at doing that. No matter how many icmp messages it gets, it happily ignores them by insisting on sending out frames of 1500 bytes with the DF-bit set. Makes trouble-shooting IPSec connections, uhm.... interesting.


Arjan H

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