still problems closing TCP(ftp) streams

Hi,
This is latest RELENG_5_3

I still have problems closing tcp (mainly ftp) streams, but can't see 
any special.

This is at home.  adsl router (pppoa, mtu/mru 1500), doing  NAPT.  local 
net working great.  Linux and Windows working well.  no time/stream 
pattern observed.

Can anyone see something strange in this tcpdump output?  It is hang at 
ftp stream closing.

thanks,

--
  josemi

23:18:34.615860 IP (tos 0x0, ttl  64, id 53638, offset 0, flags [DF], 
length: 58) antares.redesjm.local.53853 > zeppo.rediris.es.ftp: P [tcp 
sum ok] 336:342(6)ack 3473 win 33304 <nop,nop,timestamp 3084609 
128549859>

23:18:34.664133 IP (tos 0x0, ttl  53, id 64936, offset 0, flags [DF], 
length: 100) zeppo.rediris.es.ftp > antares.redesjm.local.53853: P 
3473:3521(48) ack 342 win 24616 <nop,nop,timestamp 128549863 3084609>

23:18:34.664483 IP (tos 0x0, ttl  64, id 60305, offset 0, flags [DF], 
length: 64) antares.redesjm.local.57291 > zeppo.rediris.es.48994: S 
[tcp sum ok] 3275417208:3275417208(0) win 65535 <mss 
1460,nop,nop,sackOK,nop,wscale 1,nop,nop,timestamp 3084614 0>

23:18:34.712948 IP (tos 0x0, ttl  57, id 64937, offset 0, flags [DF], 
length: 64) zeppo.rediris.es.48994 > antares.redesjm.local.57291: S 
[tcp sum ok] 3492715774:3492715774(0) ack 3275417209 win 24616 
<nop,nop,timestamp 128549868 3084614,nop,wscale 0,nop,nop,sackOK,mss 
1460>

23:18:34.713048 IP (tos 0x0, ttl  64, id 25778, offset 0, flags [DF], 
length: 52) antares.redesjm.local.57291 > zeppo.rediris.es.48994: . 
[tcp sum ok] 1:1(0) ack 1 win 33304 <nop,nop,timestamp 3084619 
128549868>

23:18:34.713206 IP (tos 0x0, ttl  64, id 54756, offset 0, flags [DF], 
length: 58) antares.redesjm.local.53853 > zeppo.rediris.es.ftp: P [tcp 
sum ok] 342:348(6)ack 3521 win 33304 <nop,nop,timestamp 3084619 
128549863>

23:18:34.765188 IP (tos 0x0, ttl  53, id 64938, offset 0, flags [DF], 
length: 82) zeppo.rediris.es.ftp > antares.redesjm.local.53853: P [tcp 
sum ok] 3521:3551(30) ack 348 win 24616 <nop,nop,timestamp 128549874 
3084619>

23:18:34.769997 IP (tos 0x8, ttl  57, id 64939, offset 0, flags [DF], 
length: 427) zeppo.rediris.es.48994 > antares.redesjm.local.57291: P 
1:376(375) ack 1 win24616 <nop,nop,timestamp 128549874 3084619>

23:18:34.770505 IP (tos 0x8, ttl  57, id 64940, offset 0, flags [DF], 
length: 52) zeppo.rediris.es.48994 > antares.redesjm.local.57291: F 
[tcp sum ok] 376:376(0) ack 1 win 24616 <nop,nop,timestamp 128549874 
3084619>

23:18:34.770606 IP (tos 0x0, ttl  64, id 26519, offset 0, flags [DF], 
length: 52) antares.redesjm.local.57291 > zeppo.rediris.es.48994: . 
[tcp sum ok] 1:1(0) ack 377 win 33304 <nop,nop,timestamp 3084625 
128549874>

23:18:34.771493 IP (tos 0x0, ttl  64, id 38399, offset 0, flags [DF], 
length: 52
) antares.redesjm.local.57291 > zeppo.rediris.es.48994: F [tcp sum ok] 
1:1(0) ack 377 win 33304 <nop,nop,timestamp 3084625 128549874>

23:18:34.823060 IP (tos 0x8, ttl  57, id 64941, offset 0, flags [DF], 
length: 52) zeppo.rediris.es.48994 > antares.redesjm.local.57291: . 
[tcp sum ok] 377:377(0) ack 2 win 24616 <nop,nop,timestamp 128549879 
3084625>

23:18:34.856005 IP (tos 0x0, ttl  64, id 13732, offset 0, flags [DF], 
length: 52) antares.redesjm.local.53853 > zeppo.rediris.es.ftp: . [tcp 
sum ok] 348:348(0)ack 3551 win 33304 <nop,nop,timestamp 3084634 
128549874>

23:18:34.902684 IP (tos 0x0, ttl  53, id 64942, offset 0, flags [DF], 
length: 105) zeppo.rediris.es.ftp > antares.redesjm.local.53853: P 
3551:3604(53) ack 348 win 24616 <nop,nop,timestamp 128549887 3084634>

23:18:34.904000 IP (tos 0x0, ttl  64, id 40099, offset 0, flags [DF], 
length: 58) antares.redesjm.local.53853 > zeppo.rediris.es.ftp: P [tcp 
sum ok] 348:354(6)ack 3604 win 33304 <nop,nop,timestamp 3084638 
128549887>

23:18:34.954132 IP (tos 0x0, ttl  53, id 64943, offset 0, flags [DF], 
length: 101) zeppo.rediris.es.ftp > antares.redesjm.local.53853: P 
3604:3653(49) ack 354 win 24616 <nop,nop,timestamp 128549892 3084638>

23:18:34.954477 IP (tos 0x0, ttl  64, id 54766, offset 0, flags [DF], 
length: 64) antares.redesjm.local.61346 > zeppo.rediris.es.35835: S 
[tcp sum ok] 3860012610:3860012610(0) win 65535 <mss 
1460,nop,nop,sackOK,nop,wscale 1,nop,nop,timestamp 3084643 0>

23:18:35.045985 IP (tos 0x0, ttl  64, id 54734, offset 0, flags [DF], 
length: 52) antares.redesjm.local.53853 > zeppo.rediris.es.ftp: . [tcp 
sum ok] 354:354(0)ack 3653 win 33304 <nop,nop,timestamp 3084653 
128549892>

23:18:37.946156 IP (tos 0x0, ttl  64, id 51670, offset 0, flags [DF], 
length: 64) antares.redesjm.local.61346 > zeppo.rediris.es.35835: S 
[tcp sum ok] 3860012610:3860012610(0) win 65535 <mss 
1460,nop,nop,sackOK,nop,wscale 1,nop,nop,timestamp 3084943 0>

23:18:41.146258 IP (tos 0x0, ttl  64, id 17586, offset 0, flags [DF], 
length: 64) antares.redesjm.local.61346 > zeppo.rediris.es.35835: S 
[tcp sum ok] 3860012610:3860012610(0) win 65535 <mss 
1460,nop,nop,sackOK,nop,wscale 1,nop,nop,timestamp 3085263 0>

23:18:44.346350 IP (tos 0x0, ttl  64, id 35811, offset 0, flags [DF], 
length: 48) antares.redesjm.local.61346 > zeppo.rediris.es.35835: S 
[tcp sum ok] 3860012610:3860012610(0) win 65535 <mss 
1460,nop,nop,sackOK>

23:18:47.546497 IP (tos 0x0, ttl  64, id 30435, offset 0, flags [DF], 
length: 48) antares.redesjm.local.61346 > zeppo.rediris.es.35835: S 
[tcp sum ok] 3860012610:3860012610(0) win 65535 <mss 
1460,nop,nop,sackOK>