From: Mike N. 

On Tue, 1 Aug 2006 23:22:12 -0400, "Geo"  wrote:

>Ok makes sense, now what would cause linux to try to recalculate the MTU?
>Could something in the tcp flags feature you mentioned increase the size of
>the ethernet but not IP packet?

  The Linux box is not recalculating the MTU - the remote end switches into
a mode that resembles MTU detection - or something else.      From packet
dumps on my end, the incident occurs on a system outside my control.

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