On Tue, 11 Nov 2008, ROUTE 66 - Catalin BOIE wrote:

quoted text
> I have captured a strange dump between a Linux kernel
> 2.6.25.6-55.fc9.x86_64 and a Samsung device.

Please upgrade or prove that the tcp fixes that were in the later kernel 
(.7 iirc or 2.6.26) got applied into that -55 part.

quoted text
> I looked at it and it seems that the Linux stack does not send any
> retransmissions to Samsung device.
> But, I want a competent look from you.
> 
> The connection is done over a 3G connection.
> The capture was done on a router between the two endpoints.
> c.66.com is the Linux machine, the other IP is the Samsung device.

...snip...

quoted text
> As you may see, the Samsung device keeps sending an ACK for 1261841 and
> after some time closes the connection.
> Why the Linux stack does no retransmissions?

Looks like a know bug in frto which got fixed.

If upgrade is not an option, you can experiment by playing with tcp_frto 
sysctl (with 0 you should not encounter that bug).

-- 
 i.
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