On 25.10.2007 15:01, Rui Paulo wrote:
On 25 Oct 2007, at 11:24, Anton Yuzhaninov wrote:
I can't connect from FreeBSD 7 box to Solaris 9. While between
FreeBSD6 and Solaris 9 tcp work fine.
I run on FreeBSD, and it nod't work:
$ fetch -o /dev/null http://mail6:8274 fetch: transfer timed out
OS versions:
FreeBSD citrin.rambler.stack.net 7.0-PRERELEASE FreeBSD 7.0-PRERELEASE
#0: Fri Oct 19 00:31:03 MSD 2007
[EMAIL PROTECTED]:/usr/obj/usr/src/sys/GENERIC amd64
SunOS mail6 5.9 Generic_117172-07 i86pc i386 i86pc
tcpdump on freebsd side:
04:26:28.332895 81.19.65.162.57161 > 81.19.71.6.8274: S [bad tcp cksum
3038!] 3123015513:3123015513(0) win 65535 <mss 1460,nop,wscale
8,sackOK,timestamp 498561841 0> (DF) (ttl 64, id 27368, len 60, bad
cksum 0!)
04:26:28.333213 81.19.71.6.8274 > 81.19.65.162.57161: S [tcp sum ok]
2890615179:2890615179(0) ack 3123015514 win 33304 <nop,nop,timestamp
622594948 498561841,mss 1460,nop,wscale 1,nop,nop,sackOK> (DF) (ttl
62, id 16035, len 64)
04:26:28.333290 81.19.65.162.57161 > 81.19.71.6.8274: . [bad tcp cksum
793f!] ack 1 win 260 <nop,nop,timestamp 498561841 622594948> (DF) (ttl
64, id 27369, len 52, bad cksum 0!)
04:26:28.334892 81.19.65.162.57161 > 81.19.71.6.8274: P [bad tcp cksum
572f!] 1:88(87) ack 1 win 260 <nop,nop,timestamp 498561843 622594948>
(DF) (ttl 64, id 27370, len 139, bad cksum 0!)
04:26:28.335148 81.19.71.6.8274 > 81.19.65.162.57161: . [tcp sum ok]
ack 88 win 33260 <nop,nop,timestamp 622594948 498561843> (DF) (ttl 62,
id 16036, len 52)
snoop in Solaris show same:
1 0.00000 81.19.65.162 -> 81.19.71.6 TCP D=8274 S=57161 Syn
Seq=3123015513 Len=0 Win=65535 Options=<mss 1460,nop,wscale
8,sackOK,tstamp 498561841 0>
2 0.00001 81.19.71.6 -> 81.19.65.162 TCP D=57161 S=8274 Syn
Ack=3123015514 Seq=2890615179 Len=0 Win=33304 Options=<nop,nop,tstamp
622594948 498561841,mss 1460,nop,wscale 1,nop,nop,sackOK>
3 0.00028 81.19.65.162 -> 81.19.71.6 TCP D=8274 S=57161
Ack=2890615180 Seq=3123015514 Len=0 Win=260 Options=<nop,nop,tstamp
498561841 622594948>
4 0.00162 81.19.65.162 -> 81.19.71.6 TCP D=8274 S=57161 Push
Ack=2890615180 Seq=3123015514 Len=87 Win=260 Options=<nop,nop,tstamp
498561843 622594948>
5 0.00003 81.19.71.6 -> 81.19.65.162 TCP D=57161 S=8274
Ack=3123015601 Seq=2890615180 Len=0 Win=33260 Options=<nop,nop,tstamp
622594948 498561843>
With net.inet.tcp.rfc1323=0 tcp work, but it should work with
rfc1323=1 (and in FreeBSD 6 tcp to SunOS work with rfc1323=1).
net.inet.tcp.log_debug=1 and nothing about this connection logged.
As silby@ already pointed out to me, try changing TCP_MAX_WINSHIFT in
src/sys/netinet/tcp.h to 4.
With TCP_MAX_WINSHIFT 4 it works.
But from other host with RELENG_7 tcp to Solaris work fine with unmodified
kernel:
IP (tos 0x0, ttl 64, id 6224, offset 0, flags [DF], proto TCP (6), length 60) 81.19.66.129.58995 >
81.19.71.6.8274: S, cksum 0x8ec9 (correct), 3166145604:3166145604(0) win 65535 <mss 1460,nop,wscale
8,sackOK,timestamp 671164 0>
IP (tos 0x0, ttl 62, id 16631, offset 0, flags [DF], proto TCP (6), length 64) 81.19.71.6.8274 >
81.19.66.129.58995: S, cksum 0xa422 (correct), 3226718107:3226718107(0) ack 3166145605 win 33304
<nop,nop,timestamp 627876130 671164,mss 1460,nop,wscale 1,nop,nop,sackOK>
IP (tos 0x0, ttl 64, id 6225, offset 0, flags [DF], proto TCP (6), length 52) 81.19.66.129.58995 >
81.19.71.6.8274: ., cksum 0x6602 (correct), ack 1 win 260 <nop,nop,timestamp 671165 627876130>
IP (tos 0x0, ttl 64, id 6226, offset 0, flags [DF], proto TCP (6), length 139) 81.19.66.129.58995 >
81.19.71.6.8274: P, cksum 0x5639 (correct), 1:88(87) ack 1 win 260 <nop,nop,timestamp 671165 627876130>
IP (tos 0x0, ttl 62, id 16632, offset 0, flags [DF], proto TCP (6), length 52) 81.19.71.6.8274 >
81.19.66.129.58995: ., cksum 0xe4c2 (correct), ack 88 win 33260 <nop,nop,timestamp 627876130 671165>
IP (tos 0x0, ttl 62, id 16633, offset 0, flags [DF], proto TCP (6), length 623) 81.19.71.6.8274 >
81.19.66.129.58995: P, cksum 0x13b8 (correct), 1:572(571) ack 88 win 33260 <nop,nop,timestamp 627876130 671165>
IP (tos 0x0, ttl 62, id 16634, offset 0, flags [DF], proto TCP (6), length 52) 81.19.71.6.8274 >
81.19.66.129.58995: F, cksum 0xe286 (correct), 572:572(0) ack 88 win 33260 <nop,nop,timestamp 627876130 671165>
IP (tos 0x0, ttl 64, id 6227, offset 0, flags [DF], proto TCP (6), length 52) 81.19.66.129.58995 >
81.19.71.6.8274: ., cksum 0x6371 (correct), ack 573 win 257 <nop,nop,timestamp 671166 627876130>
IP (tos 0x0, ttl 64, id 6228, offset 0, flags [DF], proto TCP (6), length 52) 81.19.66.129.58995 >
81.19.71.6.8274: F, cksum 0x636b (correct), 88:88(0) ack 573 win 260 <nop,nop,timestamp 671168 627876130>
IP (tos 0x0, ttl 62, id 16635, offset 0, flags [DF], proto TCP (6), length 52) 81.19.71.6.8274 >
81.19.66.129.58995: ., cksum 0xe282 (correct), ack 89 win 33260 <nop,nop,timestamp 627876130 671168>
First 5 packets in session almost same, but connction no stalled after 5th
packet.
--
WBR,
Anton Yuzhaninov
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