IP Fragmentation

Valdis.Kletnieks at vt.edu Valdis.Kletnieks at vt.edu
Wed Aug 20 13:04:13 CDT 2008

On Wed, 20 Aug 2008 21:43:44 +0530, Glen Kent said:
> Do transit routers in the wild actually get to do IP fragmentation
> these days? I was wondering if routers actually do it or not, because
> the source usually discovers the path MTU and sends its data with the
> least supported MTU. Is this true?

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

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