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Date: Tue, 11 Nov 2008 17:05:25 +0200 (EET) From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> To: ROUTE 66 - Catalin BOIE <cboie@...te66.ro> cc: Netdev <netdev@...r.kernel.org> Subject: Re: Strange TCP dump between a Linux and a Samsung phone On Tue, 11 Nov 2008, ROUTE 66 - Catalin BOIE wrote: > 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. > 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... > 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. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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