2.6.8-something tcp-winscale problem..

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Failing HTTP session:


reading from file tcpdump.66.159.197.88, link-type EN10MB (Ethernet)
22:04:14.918583 IP mea.h.zmailer.org.38866 > 
	adsl-66-159-197-88.dslextreme.com.http: S 2237082680:2237082680(0)
	win 5840 <mss 1460,sackOK,timestamp 97530101 0,nop,wscale 7>
22:04:15.123841 IP adsl-66-159-197-88.dslextreme.com.http > 
	mea.h.zmailer.org.38866: S 1005477281:1005477281(0) ack 2237082681
	win 5792 <mss 1460,sackOK,timestamp 2175895186 97530101,nop,wscale 0>
22:04:15.123981 IP mea.h.zmailer.org.38866 > 
	adsl-66-159-197-88.dslextreme.com.http: . ack 1 win 46
	<nop,nop,timestamp 97530307 2175895186>
22:04:15.124254 IP mea.h.zmailer.org.38866 > 
	adsl-66-159-197-88.dslextreme.com.http: P 1:472(471) ack 1 win 46 
	<nop,nop,timestamp 97530307 2175895186>
22:04:15.348670 IP adsl-66-159-197-88.dslextreme.com.http > 
	mea.h.zmailer.org.38866: . ack 472 win 6432
	<nop,nop,timestamp 2175895209 97530307>

Collection stopped after 60 seconds, or so.

The same target is perfectly reachable with

    echo 0  > /proc/sys/net/ipv4/tcp_window_scaling

(nominal URL:  http://n1vg.net/ )

The kernel in my workstation is running Fedora Core development branch
2.6.8-1.532smp.


DaveM ?  Alexey ?


/Matti Aarnio
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