[pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3)

Tony Finch dot at dotat.at
Wed Jun 29 06:18:08 CDT 2011


Mikael Abrahamsson <swmike at swm.pp.se> wrote:
>
> Well, then you run into the nice problem of the RNCs only having 400 kilobytes
> of buffers per session and will drop packets if they receive more packets than
> that, or sometimes even just because they receive a burst of a few tens of
> packets at GigE linerate (because the customer with large TCP window size is
> talking to a GigE connected server).

Excessively large buffers are a problem because they break TCP's RTT
measurement. Also TCP cannot measure the available bandwidth without
packet loss.

Tony.
-- 
f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Biscay: Northerly or northwesterly, but northeasterly in far southwest 4 or 5,
occasionally 6 in east and far southwest. Slight or moderate. Mainly fair.
Good.




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