OCD window scaling behavior on local network.

[Zaphod Beeblebrox]

so... I have some really OCD window scaling behavior on a GigE local
network.  The protocol is BGP, this is one session recorded.  Nearly every
payload packet is answered by both an 'ACK' and a 2nd window scaling
packet.  I have examined the packet counters: no errors reported by the box
or the managed switch.  Also, TCP-MD5 is not in use, if that matters.

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