North American Network Operators Group
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Re: IP Fragmentation

  • From: Iljitsch van Beijnum
  • Date: Wed Aug 20 14:09:47 2008
On 20 aug 2008, at 20:04, [email protected] wrote:

Hypothetically true. Unfortunately, enough places do bozo firewalling and drop
the ICMP Frag Needed packets to severely limit the utility of PMTU Discovery.

Yet all OSes have it enabled and there is no fallback to fragmentation in PMTUD: if your system doesn't get the ICMP messages, your session is dead in the water.