* Re: 2.6.27 seems to break something with DSL (fwd)
@ 2008-10-17 20:11 Olon
2008-10-18 11:09 ` Jarek Poplawski
2008-10-18 21:11 ` Jarek Poplawski
0 siblings, 2 replies; 4+ messages in thread
From: Olon @ 2008-10-17 20:11 UTC (permalink / raw)
To: netdev
Hi there,
I can confirm this issue.
I'm using a westell dsl modem, and going from 2.6.26.5 to .27. I found that I
couldn't connect to most websites either.
This modem is in passthrough mode and not nat.
Here is a dump of my attempt to connect to port 80 on gnu.org
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
14:14:27.213995 IP (tos 0x0, ttl 64, id 44805, offset 0, flags [DF], proto:
TCP (6), length: 52) 96.246.106.2.34127 > 199.232.41.10.80: F, cksum 0x6b68
(correct), 1665374024:1665374024(0) ack 1967527671 win 183 <nop,nop,timestamp
2701875 3655675399>
14:14:27.277189 IP (tos 0x0, ttl 51, id 15270, offset 0, flags [DF], proto:
TCP (6), length: 52) 199.232.41.10.80 > 96.246.106.2.34127: ., cksum 0x3eed
(correct), 2897:2897(0) ack 1 win 2892 <nop,nop,timestamp 3655681181 2701875>
14:14:29.082243 IP (tos 0x0, ttl 64, id 34370, offset 0, flags [DF], proto:
TCP (6), length: 60) 96.246.106.2.59921 > 199.232.41.10.80: S, cksum 0x1638
(correct), 1808254781:1808254781(0) win 5840 <sackOK,timestamp 2703743 0,mss
1460,nop,wscale 5>
14:14:29.129687 IP (tos 0x0, ttl 51, id 0, offset 0, flags [DF], proto: TCP
(6), length: 60) 199.232.41.10.80 > 96.246.106.2.59921: S, cksum 0xb3fe
(correct), 1977796289:1977796289(0) ack 1808254782 win 5792 <mss
1452,sackOK,timestamp 3655683033 2703743,nop,wscale 2>
14:14:29.129708 IP (tos 0x0, ttl 64, id 34371, offset 0, flags [DF], proto:
TCP (6), length: 52) 96.246.106.2.59921 > 199.232.41.10.80: ., cksum 0xf876
(correct), 1:1(0) ack 1 win 183 <nop,nop,timestamp 2703791 3655683033>
14:14:29.130587 IP (tos 0x0, ttl 64, id 34372, offset 0, flags [DF], proto:
TCP (6), length: 1492) 96.246.106.2.59921 > 199.232.41.10.80: . 1:1441(1440)
ack 1 win 183 <nop,nop,timestamp 2703791 3655683033>
14:14:29.130776 IP (tos 0x0, ttl 64, id 34373, offset 0, flags [DF], proto:
TCP (6), length: 1033) 96.246.106.2.59921 > 199.232.41.10.80: P 1441:2422(981)
ack 1 win 183 <nop,nop,timestamp 2703792 3655683033>
14:14:29.336008 IP (tos 0x0, ttl 51, id 35550, offset 0, flags [DF], proto:
TCP (6), length: 52) 199.232.41.10.80 > 96.246.106.2.59921: ., cksum 0xea41
(correct), 1:1(0) ack 1441 win 2172 <nop,nop,timestamp 3655683241 2703791>
14:14:29.422389 IP (tos 0x0, ttl 51, id 35552, offset 0, flags [DF], proto:
TCP (6), length: 52) 199.232.41.10.80 > 96.246.106.2.59921: ., cksum 0xe345
(correct), 1:1(0) ack 2422 win 2892 <nop,nop,timestamp 3655683327 2703792>
however, I can send+receive icmp
ping www.gnu.org
PING gnu.org (199.232.41.10) 56(84) bytes of data.
64 bytes from www.gnu.org (199.232.41.10): icmp_seq=1 ttl=51 time=50.5 ms
64 bytes from www.gnu.org (199.232.41.10): icmp_seq=2 ttl=51 time=36.9 ms
64 bytes from www.gnu.org (199.232.41.10): icmp_seq=3 ttl=51 time=34.7 ms
64 bytes from www.gnu.org (199.232.41.10): icmp_seq=4 ttl=51 time=37.4 ms
64 bytes from www.gnu.org (199.232.41.10): icmp_seq=5 ttl=51 time=35.5 ms
ping -s 1000 gnu.org
PING gnu.org (199.232.41.10) 1000(1028) bytes of data.
1008 bytes from www.gnu.org (199.232.41.10): icmp_seq=1 ttl=51 time=147 ms
1008 bytes from www.gnu.org (199.232.41.10): icmp_seq=2 ttl=51 time=102 ms
1008 bytes from www.gnu.org (199.232.41.10): icmp_seq=3 ttl=51 time=101 ms
1008 bytes from www.gnu.org (199.232.41.10): icmp_seq=4 ttl=51 time=100 ms
1008 bytes from www.gnu.org (199.232.41.10): icmp_seq=5 ttl=51 time=102 ms
tcpdump not port 22 -nvvv
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
14:26:30.791235 IP (tos 0x0, ttl 64, id 17580, offset 0, flags [DF], proto:
UDP (17), length: 53) 96.246.106.2.50098 > 192.168.1.1.53: [udp sum ok] 3605+
A? gnu.org. (25)
14:26:30.793290 IP (tos 0x0, ttl 64, id 3163, offset 0, flags [none], proto:
UDP (17), length: 69) 192.168.1.1.53 > 96.246.106.2.50098: [udp sum ok] 3605
q: A? gnu.org. 1/0/0 gnu.org. A 199.232.41.10 (41)
14:26:30.793789 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto: ICMP
(1), length: 1028) 96.246.106.2 > 199.232.41.10: ICMP echo request, id 37656,
seq 1, length 1008
14:26:30.941269 IP (tos 0x0, ttl 51, id 59350, offset 0, flags [none], proto:
ICMP (1), length: 1028) 199.232.41.10 > 96.246.106.2: ICMP echo reply, id
37656, seq 1, length 1008
14:26:30.941769 IP (tos 0x0, ttl 64, id 17731, offset 0, flags [DF], proto:
UDP (17), length: 72) 96.246.106.2.37518 > 192.168.1.1.53: [udp sum ok] 1788+
PTR? 10.41.232.199.in-addr.arpa. (44)
14:26:30.943781 IP (tos 0x0, ttl 64, id 3164, offset 0, flags [none], proto:
UDP (17), length: 122) 192.168.1.1.53 > 96.246.106.2.37518: 1788 q: PTR?
10.41.232.199.in-addr.arpa. 2/0/0 10.41.232.199.in-addr.arpa.[|domain]
14:26:31.794694 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto: ICMP
(1), length: 1028) 96.246.106.2 > 199.232.41.10: ICMP echo request, id 37656,
seq 2, length 1008
14:26:31.897004 IP (tos 0x0, ttl 51, id 59351, offset 0, flags [none], proto:
ICMP (1), length: 1028) 199.232.41.10 > 96.246.106.2: ICMP echo reply, id
37656, seq 2, length 1008
14:26:31.897424 IP (tos 0x0, ttl 64, id 18686, offset 0, flags [DF], proto:
UDP (17), length: 72) 96.246.106.2.53838 > 192.168.1.1.53: [udp sum ok] 61713+
PTR? 10.41.232.199.in-addr.arpa. (44)
14:26:31.899461 IP (tos 0x0, ttl 64, id 3165, offset 0, flags [none], proto:
UDP (17), length: 122) 192.168.1.1.53 > 96.246.106.2.53838: 61713 q: PTR?
10.41.232.199.in-addr.arpa. 2/0/0 10.41.232.199.in-addr.arpa.[|domain]
14:26:32.795702 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto: ICMP
(1), length: 1028) 96.246.106.2 > 199.232.41.10: ICMP echo request, id 37656,
seq 3, length 1008
14:26:32.896773 IP (tos 0x0, ttl 51, id 59352, offset 0, flags [none], proto:
ICMP (1), length: 1028) 199.232.41.10 > 96.246.106.2: ICMP echo reply, id
37656, seq 3, length 1008
14:26:32.897175 IP (tos 0x0, ttl 64, id 19686, offset 0, flags [DF], proto:
UDP (17), length: 72) 96.246.106.2.51768 > 192.168.1.1.53: [udp sum ok] 50002+
PTR? 10.41.232.199.in-addr.arpa. (44)
14:26:32.899209 IP (tos 0x0, ttl 64, id 3166, offset 0, flags [none], proto:
UDP (17), length: 122) 192.168.1.1.53 > 96.246.106.2.51768: 50002 q: PTR?
10.41.232.199.in-addr.arpa. 2/0/0 10.41.232.199.in-addr.arpa.[|domain]
14:26:33.796709 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto: ICMP
(1), length: 1028) 96.246.106.2 > 199.232.41.10: ICMP echo request, id 37656,
seq 4, length 1008
14:26:33.896804 IP (tos 0x0, ttl 51, id 59353, offset 0, flags [none], proto:
ICMP (1), length: 1028) 199.232.41.10 > 96.246.106.2: ICMP echo reply, id
37656, seq 4, length 1008
14:26:33.897202 IP (tos 0x0, ttl 64, id 20686, offset 0, flags [DF], proto:
UDP (17), length: 72) 96.246.106.2.53984 > 192.168.1.1.53: [udp sum ok] 40904+
PTR? 10.41.232.199.in-addr.arpa. (44)
14:26:33.899239 IP (tos 0x0, ttl 64, id 3167, offset 0, flags [none], proto:
UDP (17), length: 122) 192.168.1.1.53 > 96.246.106.2.53984: 40904 q: PTR?
10.41.232.199.in-addr.arpa. 2/0/0 10.41.232.199.in-addr.arpa.[|domain]
-------------------------------------------------------------------------------------------------------------------
attempting to get to kernel.org
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
14:33:37.394450 IP (tos 0x0, ttl 64, id 50967, offset 0, flags [DF], proto:
UDP (17), length: 56) 96.246.106.2.57769 > 192.168.1.1.53: [udp sum ok] 23128+
A? kernel.org. (28)
14:33:37.537163 IP (tos 0x0, ttl 64, id 3180, offset 0, flags [none], proto:
UDP (17), length: 88) 192.168.1.1.53 > 96.246.106.2.57769: 23128 q: A?
kernel.org. 2/0/0 kernel.org. A 204.152.191.5, kernel.org. (60)
14:33:37.539985 IP (tos 0x0, ttl 64, id 51113, offset 0, flags [DF], proto:
UDP (17), length: 56) 96.246.106.2.48629 > 192.168.1.1.53: [udp sum ok] 53919+
A? kernel.org. (28)
14:33:37.542025 IP (tos 0x0, ttl 64, id 3181, offset 0, flags [none], proto:
UDP (17), length: 88) 192.168.1.1.53 > 96.246.106.2.48629: 53919 q: A?
kernel.org. 2/0/0 kernel.org. A 204.152.191.5, kernel.org. (60)
14:33:37.542964 IP (tos 0x0, ttl 64, id 53172, offset 0, flags [DF], proto:
TCP (6), length: 60) 96.246.106.2.58789 > 204.152.191.5.80: S, cksum 0x88bf
(correct), 2615609368:2615609368(0) win 5840 <sackOK,timestamp 3852204 0,mss
1460,nop,wscale 5>
14:33:37.740973 IP (tos 0x0, ttl 55, id 0, offset 0, flags [DF], proto: TCP
(6), length: 60) 204.152.191.5.80 > 96.246.106.2.58789: S, cksum 0x89d1
(correct), 2581817972:2581817972(0) ack 2615609369 win 5792 <mss
1452,sackOK,timestamp 759090556 3852204,nop,wscale 7>
14:33:37.740998 IP (tos 0x0, ttl 64, id 53173, offset 0, flags [DF], proto:
TCP (6), length: 52) 96.246.106.2.58789 > 204.152.191.5.80: ., cksum 0xcdb8
(correct), 1:1(0) ack 1 win 183 <nop,nop,timestamp 3852402 759090556>
14:33:37.741908 IP (tos 0x0, ttl 64, id 53174, offset 0, flags [DF], proto:
TCP (6), length: 1492) 96.246.106.2.58789 > 204.152.191.5.80: . 1:1441(1440)
ack 1 win 183 <nop,nop,timestamp 3852403 759090556>
14:33:37.742076 IP (tos 0x0, ttl 64, id 53175, offset 0, flags [DF], proto:
TCP (6), length: 1032) 96.246.106.2.58789 > 204.152.191.5.80: P 1441:2421(980)
ack 1 win 183 <nop,nop,timestamp 3852403 759090556>
14:33:37.980932 IP (tos 0x0, ttl 55, id 42008, offset 0, flags [DF], proto:
TCP (6), length: 52) 204.152.191.5.80 > 96.246.106.2.58789: ., cksum 0xc799
(correct), 1:1(0) ack 1441 win 68 <nop,nop,timestamp 759090797 3852403>
14:33:38.066904 IP (tos 0x0, ttl 55, id 42009, offset 0, flags [DF], proto:
TCP (6), length: 52) 204.152.191.5.80 > 96.246.106.2.58789: ., cksum 0xc358
(correct), 1:1(0) ack 2421 win 91 <nop,nop,timestamp 759090883 3852403>
14:33:54.621879 IP (tos 0x0, ttl 64, id 53176, offset 0, flags [DF], proto:
TCP (6), length: 52) 96.246.106.2.58789 > 204.152.191.5.80: F, cksum 0x810b
(correct), 2421:2421(0) ack 1 win 183 <nop,nop,timestamp 3869283 759090883>
14:33:54.792368 IP (tos 0x0, ttl 55, id 42016, offset 0, flags [DF], proto:
TCP (6), length: 52) 204.152.191.5.80 > 96.246.106.2.58789: ., cksum 0x34c0
(correct), 2897:2897(0) ack 2422 win 91 <nop,nop,timestamp 759107610 3869283>
attempting to get to www.news.com
tcpdump not port 22 -nvvv
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
14:30:21.287441 IP (tos 0x0, ttl 64, id 51468, offset 0, flags [DF], proto:
UDP (17), length: 58) 96.246.106.2.53783 > 192.168.1.1.53: [udp sum ok] 22653+
A? www.news.com. (30)
14:30:21.354417 IP (tos 0x0, ttl 64, id 3172, offset 0, flags [none], proto:
UDP (17), length: 134) 192.168.1.1.53 > 96.246.106.2.53783: 22653 q: A?
www.news.com. 2/0/0 www.news.com. CNAME[|domain]
14:30:21.376541 IP (tos 0x0, ttl 64, id 51557, offset 0, flags [DF], proto:
UDP (17), length: 58) 96.246.106.2.46616 > 192.168.1.1.53: [udp sum ok] 21293+
A? www.news.com. (30)
14:30:21.378559 IP (tos 0x0, ttl 64, id 3173, offset 0, flags [none], proto:
UDP (17), length: 134) 192.168.1.1.53 > 96.246.106.2.46616: 21293 q: A?
www.news.com. 2/0/0 www.news.com. CNAME[|domain]
14:30:21.379443 IP (tos 0x0, ttl 64, id 1194, offset 0, flags [DF], proto: TCP
(6), length: 60) 96.246.106.2.39802 > 216.239.122.102.80: S, cksum 0xfa15
(correct), 3852520898:3852520898(0) win 5840 <sackOK,timestamp 3656040 0,mss
1460,nop,wscale 5>
14:30:21.499309 IP (tos 0x0, ttl 245, id 55551, offset 0, flags [none], proto:
TCP (6), length: 44) 216.239.122.102.80 > 96.246.106.2.39802: S, cksum 0x91bd
(correct), 3608125909:3608125909(0) ack 3852520899 win 8190 <mss 1452>
14:30:21.499338 IP (tos 0x0, ttl 64, id 1195, offset 0, flags [DF], proto: TCP
(6), length: 40) 96.246.106.2.39802 > 216.239.122.102.80: ., cksum 0xb2a0
(correct), 1:1(0) ack 1 win 5840
14:30:21.500228 IP (tos 0x0, ttl 64, id 1196, offset 0, flags [DF], proto: TCP
(6), length: 1492) 96.246.106.2.39802 > 216.239.122.102.80: . 1:1453(1452) ack
1 win 5840
14:30:21.500241 IP (tos 0x0, ttl 64, id 1197, offset 0, flags [DF], proto: TCP
(6), length: 1010) 96.246.106.2.39802 > 216.239.122.102.80: P 1453:2423(970)
ack 1 win 5840
14:30:21.765831 IP (tos 0x0, ttl 54, id 29130, offset 0, flags [DF], proto:
TCP (6), length: 40) 216.239.122.102.80 > 96.246.106.2.39802: ., cksum 0x8742
(correct), 1:1(0) ack 2423 win 14520
14:30:21.771801 IP (tos 0x0, ttl 54, id 64782, offset 0, flags [DF], proto:
TCP (6), length: 514) 216.239.122.102.80 > 96.246.106.2.39802: FP 1:475(474)
ack 2423 win 14520
14:30:21.773059 IP (tos 0x0, ttl 64, id 1198, offset 0, flags [DF], proto: TCP
(6), length: 40) 96.246.106.2.39802 > 216.239.122.102.80: F, cksum 0xa4fe
(correct), 2423:2423(0) ack 476 win 6432
14:30:21.909802 IP (tos 0x0, ttl 245, id 59929, offset 0, flags [none], proto:
TCP (6), length: 40) 216.239.122.102.80 > 96.246.106.2.39802: ., cksum 0x8566
(correct), 476:476(0) ack 2424 win 14520
14:30:23.775805 IP (tos 0x0, ttl 64, id 53957, offset 0, flags [DF], proto:
UDP (17), length: 59) 96.246.106.2.37171 > 192.168.1.1.53: [udp sum ok] 43291+
A? news.cnet.com. (31)
14:30:23.825751 IP (tos 0x0, ttl 64, id 3175, offset 0, flags [none], proto:
UDP (17), length: 150) 192.168.1.1.53 > 96.246.106.2.37171: 43291 q: A?
news.cnet.com. 3/0/0 news.cnet.com. CNAME[|domain]
14:30:23.826693 IP (tos 0x0, ttl 64, id 48226, offset 0, flags [DF], proto:
TCP (6), length: 60) 96.246.106.2.36303 > 216.239.122.178.80: S, cksum 0x5aff
(correct), 3886968474:3886968474(0) win 5840 <sackOK,timestamp 3658488 0,mss
1460,nop,wscale 5>
14:30:23.929033 IP (tos 0x0, ttl 245, id 22268, offset 0, flags [none], proto:
TCP (6), length: 44) 216.239.122.178.80 > 96.246.106.2.36303: S, cksum 0x4f4d
(correct), 1379128219:1379128219(0) ack 3886968475 win 8190 <mss 1452>
14:30:23.929062 IP (tos 0x0, ttl 64, id 48227, offset 0, flags [DF], proto:
TCP (6), length: 40) 96.246.106.2.36303 > 216.239.122.178.80: ., cksum 0x7030
(correct), 1:1(0) ack 1 win 5840
14:30:23.929938 IP (tos 0x0, ttl 64, id 48228, offset 0, flags [DF], proto:
TCP (6), length: 1492) 96.246.106.2.36303 > 216.239.122.178.80: . 1:1453(1452)
ack 1 win 5840
14:30:23.930101 IP (tos 0x0, ttl 64, id 48229, offset 0, flags [DF], proto:
TCP (6), length: 1011) 96.246.106.2.36303 > 216.239.122.178.80: P
1453:2424(971) ack 1 win 5840
14:30:24.215020 IP (tos 0x0, ttl 54, id 8484, offset 0, flags [DF], proto: TCP
(6), length: 40) 216.239.122.178.80 > 96.246.106.2.36303: ., cksum 0x11c5
(correct), 1:1(0) ack 2424 win 27588
14:30:24.262465 IP (tos 0x0, ttl 245, id 22541, offset 0, flags [+], proto: TCP
(6), length: 764) 216.239.122.178.80 > 96.246.106.2.36303: P 1461:2185(724) ack
2424 win 27588
14:30:24.270508 IP (tos 0x0, ttl 245, id 22541, offset 744, flags [none],
proto: TCP (6), length: 756) 216.239.122.178 > 96.246.106.2: tcp
14:30:24.270535 IP (tos 0x0, ttl 64, id 48230, offset 0, flags [DF], proto:
TCP (6), length: 40) 96.246.106.2.36303 > 216.239.122.178.80: ., cksum 0x66b9
(correct), 2424:2424(0) ack 1 win 5840
14:30:24.278940 IP (tos 0x0, ttl 245, id 22797, offset 0, flags [+], proto: TCP
(6), length: 764) 216.239.122.178.80 > 96.246.106.2.36303: P 2921:3645(724) ack
2424 win 27588
14:30:24.287262 IP (tos 0x0, ttl 245, id 22797, offset 744, flags [none],
proto: TCP (6), length: 756) 216.239.122.178 > 96.246.106.2: tcp
14:30:24.287288 IP (tos 0x0, ttl 64, id 48231, offset 0, flags [DF], proto:
TCP (6), length: 40) 96.246.106.2.36303 > 216.239.122.178.80: ., cksum 0x66b9
(correct), 2424:2424(0) ack 1 win 5840
14:30:24.295696 IP (tos 0x0, ttl 245, id 23053, offset 0, flags [+], proto: TCP
(6), length: 764) 216.239.122.178.80 > 96.246.106.2.36303: P 4381:5105(724) ack
2424 win 27588
14:30:24.304030 IP (tos 0x0, ttl 245, id 23053, offset 744, flags [none],
proto: TCP (6), length: 756) 216.239.122.178 > 96.246.106.2: tcp
14:30:24.304056 IP (tos 0x0, ttl 64, id 48232, offset 0, flags [DF], proto:
TCP (6), length: 40) 96.246.106.2.36303 > 216.239.122.178.80: ., cksum 0x66b9
(correct), 2424:2424(0) ack 1 win 5840
now I can get to one website, lynx.isc.org:
tcpdump not port 22 -nvvv
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
14:33:00.815961 IP (tos 0x0, ttl 64, id 14389, offset 0, flags [DF], proto:
UDP (17), length: 58) 96.246.106.2.43004 > 192.168.1.1.53: [udp sum ok] 21912+
A? lynx.isc.org. (30)
14:33:00.862999 IP (tos 0x0, ttl 64, id 3178, offset 0, flags [none], proto:
UDP (17), length: 74) 192.168.1.1.53 > 96.246.106.2.43004: [udp sum ok] 21912
q: A? lynx.isc.org. 1/0/0 lynx.isc.org. A 204.152.184.112 (46)
14:33:00.863999 IP (tos 0x0, ttl 64, id 26362, offset 0, flags [DF], proto:
TCP (6), length: 60) 96.246.106.2.36959 > 204.152.184.112.80: S, cksum 0x3f78
(correct), 2043305631:2043305631(0) win 5840 <sackOK,timestamp 3815525 0,mss
1460,nop,wscale 5>
14:33:01.023448 IP (tos 0x0, ttl 55, id 40963, offset 0, flags [DF], proto:
TCP (6), length: 64) 204.152.184.112.80 > 96.246.106.2.36959: S, cksum 0x4861
(correct), 3326481792:3326481792(0) ack 2043305632 win 65535 <mss
1452,nop,wscale 0,nop,nop,timestamp 134158359 3815525,nop,nop,sackOK>
14:33:01.023495 IP (tos 0x0, ttl 64, id 26363, offset 0, flags [DF], proto:
TCP (6), length: 52) 96.246.106.2.36959 > 204.152.184.112.80: ., cksum 0x87ce
(correct), 1:1(0) ack 1 win 183 <nop,nop,timestamp 3815684 134158359>
14:33:01.024431 IP (tos 0x0, ttl 64, id 26364, offset 0, flags [DF], proto:
TCP (6), length: 1492) 96.246.106.2.36959 > 204.152.184.112.80: . 1:1441(1440)
ack 1 win 183 <nop,nop,timestamp 3815685 134158359>
14:33:01.024596 IP (tos 0x0, ttl 64, id 26365, offset 0, flags [DF], proto:
TCP (6), length: 1034) 96.246.106.2.36959 > 204.152.184.112.80: P
1441:2423(982) ack 1 win 183 <nop,nop,timestamp 3815685 134158359>
14:33:01.267089 IP (tos 0x0, ttl 55, id 41119, offset 0, flags [DF], proto:
TCP (6), length: 52) 204.152.184.112.80 > 96.246.106.2.36959: ., cksum 0x843b
(correct), 1:1(0) ack 1441 win 65168 <nop,nop,timestamp 134158383 3815685>
14:33:01.353318 IP (tos 0x0, ttl 55, id 41204, offset 0, flags [DF], proto:
TCP (6), length: 52) 204.152.184.112.80 > 96.246.106.2.36959: ., cksum 0x7eed
(correct), 1:1(0) ack 2423 win 65535 <nop,nop,timestamp 134158392 3815685>
14:33:01.360548 IP (tos 0x0, ttl 55, id 41206, offset 0, flags [DF], proto:
TCP (6), length: 607) 204.152.184.112.80 > 96.246.106.2.36959: P 1449:2004(555)
ack 2423 win 65535 <nop,nop,timestamp 134158392 3815685>
14:33:01.360566 IP (tos 0x0, ttl 64, id 26366, offset 0, flags [DF], proto:
TCP (6), length: 64) 96.246.106.2.36959 > 204.152.184.112.80: ., cksum 0x81c4
(correct), 2423:2423(0) ack 1 win 183 <nop,nop,timestamp 3816021
134158392,nop,nop,sack 1 {1449:2004}>
14:33:01.361317 IP (tos 0x0, ttl 55, id 41214, offset 0, flags [DF], proto:
TCP (6), length: 52) 204.152.184.112.80 > 96.246.106.2.36959: F, cksum 0x7719
(correct), 2004:2004(0) ack 2423 win 65535 <nop,nop,timestamp 134158392
3815685>
14:33:01.361332 IP (tos 0x0, ttl 64, id 26367, offset 0, flags [DF], proto:
TCP (6), length: 64) 96.246.106.2.36959 > 204.152.184.112.80: ., cksum 0x81c2
(correct), 2423:2423(0) ack 1 win 183 <nop,nop,timestamp 3816022
134158392,nop,nop,sack 1 {1449:2005}>
14:33:01.445861 IP (tos 0x0, ttl 55, id 41251, offset 0, flags [DF], proto:
TCP (6), length: 1492) 204.152.184.112.80 > 96.246.106.2.36959: . 1:1441(1440)
ack 2423 win 65535 <nop,nop,timestamp 134158400 3815685>
14:33:01.445893 IP (tos 0x0, ttl 64, id 26368, offset 0, flags [DF], proto:
TCP (6), length: 64) 96.246.106.2.36959 > 204.152.184.112.80: ., cksum 0x7b6b
(correct), 2423:2423(0) ack 1441 win 273 <nop,nop,timestamp 3816107
134158400,nop,nop,sack 1 {1449:2005}>
14:33:01.452430 IP (tos 0x0, ttl 55, id 41252, offset 0, flags [DF], proto:
TCP (6), length: 615) 204.152.184.112.80 > 96.246.106.2.36959: FP
1441:2004(563) ack 2423 win 65535 <nop,nop,timestamp 134158400 3815685>
14:33:01.453235 IP (tos 0x0, ttl 64, id 26369, offset 0, flags [DF], proto:
TCP (6), length: 52) 96.246.106.2.36959 > 204.152.184.112.80: F, cksum 0x73f8
(correct), 2423:2423(0) ack 2005 win 363 <nop,nop,timestamp 3816114 134158400>
14:33:01.674509 IP (tos 0x0, ttl 55, id 41380, offset 0, flags [DF], proto:
TCP (6), length: 52) 204.152.184.112.80 > 96.246.106.2.36959: ., cksum 0x754c
(correct), 2005:2005(0) ack 2424 win 65534 <nop,nop,timestamp 134158424
3816114>
-olon
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: 2.6.27 seems to break something with DSL (fwd)
2008-10-17 20:11 2.6.27 seems to break something with DSL (fwd) Olon
@ 2008-10-18 11:09 ` Jarek Poplawski
2008-10-18 21:11 ` Jarek Poplawski
1 sibling, 0 replies; 4+ messages in thread
From: Jarek Poplawski @ 2008-10-18 11:09 UTC (permalink / raw)
To: olon; +Cc: netdev
Olon wrote, On 10/17/2008 10:11 PM:
>
> Hi there,
Hi,
>
> I can confirm this issue.
> I'm using a westell dsl modem, and going from 2.6.26.5 to .27. I found that I
> couldn't connect to most websites either.
> This modem is in passthrough mode and not nat.
>
> Here is a dump of my attempt to connect to port 80 on gnu.org
>
> tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
> 14:14:27.213995 IP (tos 0x0, ttl 64, id 44805, offset 0, flags [DF], proto:
> TCP (6), length: 52) 96.246.106.2.34127 > 199.232.41.10.80: F, cksum 0x6b68
> (correct), 1665374024:1665374024(0) ack 1967527671 win 183 <nop,nop,timestamp
> 2701875 3655675399>
Could you let us compare such logs for working vs. not working case?
Is this eth0 connected directly to modem with ethernet?
Could you also try to set lower mtu (eg. 1400) on eth0 and maybe this:
echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
Thanks,
Jarek P.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: 2.6.27 seems to break something with DSL (fwd)
2008-10-17 20:11 2.6.27 seems to break something with DSL (fwd) Olon
2008-10-18 11:09 ` Jarek Poplawski
@ 2008-10-18 21:11 ` Jarek Poplawski
2008-10-20 10:57 ` Ilpo Järvinen
1 sibling, 1 reply; 4+ messages in thread
From: Jarek Poplawski @ 2008-10-18 21:11 UTC (permalink / raw)
To: olon; +Cc: netdev
Olon wrote, On 10/17/2008 10:11 PM:
>
> Hi there,
>
> I can confirm this issue.
> I'm using a westell dsl modem, and going from 2.6.26.5 to .27. I found that I
> couldn't connect to most websites either.
> This modem is in passthrough mode and not nat.
Could you try this?:
echo 0 > /proc/sys/net/ipv4/tcp_sack
It looks like it helped in a similar problem here:
http://bugzilla.kernel.org/show_bug.cgi?id=11721
Jarek P.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: 2.6.27 seems to break something with DSL (fwd)
2008-10-18 21:11 ` Jarek Poplawski
@ 2008-10-20 10:57 ` Ilpo Järvinen
0 siblings, 0 replies; 4+ messages in thread
From: Ilpo Järvinen @ 2008-10-20 10:57 UTC (permalink / raw)
To: Jarek Poplawski; +Cc: olon, Netdev
On Sat, 18 Oct 2008, Jarek Poplawski wrote:
> Olon wrote, On 10/17/2008 10:11 PM:
>
> > I can confirm this issue.
> > I'm using a westell dsl modem, and going from 2.6.26.5 to .27. I found that I
> > couldn't connect to most websites either.
> > This modem is in passthrough mode and not nat.
>
> Could you try this?:
> echo 0 > /proc/sys/net/ipv4/tcp_sack
>
> It looks like it helped in a similar problem here:
> http://bugzilla.kernel.org/show_bug.cgi?id=11721
In this case there are some other things as well... as connections get
successfully established...
Analysis of the case from tcp side:
gnu.org)
- Established ok, request (at least 2422 bytes) is sent and acked,
response never arrives (or tcpdump didn't get them)... Is this our
fault at all?
kernel.org)
2421 request sent and acked, then long delay and at :54.621879 we close
the socket (or the app exits), the response to fin indicates that ~2896
bytes were sent by the kernel.org but they never arrived (or for some
reason tcpdump didn't catch them). Is this our fault?
www.news.com)
Connection to 216.239.122.102 successful, working as expected (a quick
look only, no in depth check per field :-)).
Connection to 216.239.122.178, well, it's miserable... We send 2424 and
it gets acked. They send some with funny fragmentation (and 1:1461
missing anyway):
14:30:24.262465 IP (tos 0x0, ttl 245, id 22541, offset 0,
flags [+], proto: TCP (6), length: 764) 216.239.122.178.80 >
96.246.106.2.36303: P 1461:2185(724) ack 2424 win 27588
14:30:24.270508 IP (tos 0x0, ttl 245, id 22541, offset 744, flags [none],
proto: TCP (6), length: 756) 216.239.122.178 > ...
...which we'll respond (and probably queue that too into ofo queue) and
we ack 1 which is the right thing to do. ...and tcpdump is too short to
see retransmission of 1:1461 if they ever would come. Afaict we did
nothing wrong here...
Olon, please don't wrap lines next time if you include tcpdumps... :-)
--
i.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2008-10-20 10:57 UTC | newest]
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2008-10-17 20:11 2.6.27 seems to break something with DSL (fwd) Olon
2008-10-18 11:09 ` Jarek Poplawski
2008-10-18 21:11 ` Jarek Poplawski
2008-10-20 10:57 ` Ilpo Järvinen
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