IP Fragmentation

Iljitsch van Beijnum iljitsch at muada.com
Wed Aug 20 13:09:32 CDT 2008

On 20 aug 2008, at 20:04, Valdis.Kletnieks at vt.edu 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.

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