[mpls-linux-general] Problem with tcp connections using MPLS
Status: Beta
Brought to you by:
jleu
Menu
▾
▴
[mpls-linux-general] Problem with tcp connections using MPLS
|
From: <gui...@ya...> - 2005-12-21 23:21:45
|
Hello,
I`m having some problems with MPLS when making tcp
connections using MPLS (I`m trying to test with ssh
and www. ICMP works fine.). I have two FC2 machines
with rpm installations (I tryed to compile by hand and
use KNOPPIX too, but I got the same erros).
I did a simple testbed like:
1000
Host A --------------- > Host B
< ---------------
2000
I used the following commands to configure:
#########
#Host A:#
#########
ifconfig eth2 192.168.0.1 netmask 255.255.255.0
mpls nhlfe add key 0
mpls nhlfe change key 0x00000002 instructions push gen
1000 nexthop eth2 ipv4 192.168.0.2
ip route add 192.168.0.2/32 via 192.168.0.1 spec_nh
0x8847 0x0000002 advmss 1400
mpls labelspace add dev eth2 labelspace 0
mpls ilm add label gen 2000 labelspace 0
#########
#Host B:#
#########
ifconfig eth0 192.168.0.2 netmask 255.255.255.0
mpls nhlfe add key 0
mpls nhlfe change key 0x00000002 instructions push gen
2000 nexthop eth0 ipv4 192.168.0.1
ip route add 192.168.0.1/32 via 192.168.0.2 spec_nh
0x8847 0x0000002 advmss 1400
mpls labelspace add dev eth0 labelspace 0
mpls ilm add label gen 1000 labelspace 0
----
The ssh connection only works if I disable the tx/rx
checksum with ethtool.
I will copy a tcpdump of a ssh connection to help you
understand the problem.
-----
21:06:07.774317 MPLS (label 2000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 35448, offset 0,
flags [DF], proto 6, length: 60) 192.168.0.2.32779 >
192.168.0.1.ssh: S [tcp sum ok]
1525719340:1525719340(0) win 5600 <mss
1400,sackOK,timestamp 5188436 0,nop,wscale 2>
0x0000: 007d 0140 4500 003c 8a78 4000 4006
2ef0 .}.@E..<.x@.@...
0x0010: c0a8 0002 c0a8 0001 800b 0016 5af0
a12c ............Z..,
0x0020: 0000 0000 a002 15e0 092c 0000 0204
0578 .........,.....x
0x0030: 0402 080a 004f 2b54 0000 0000 0103
0302 .....O+T........
21:06:07.777745 MPLS (label 1000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 0, offset 0, flags
[DF], proto 6, length: 60) 192.168.0.1.ssh >
192.168.0.2.32779: S [tcp sum ok]
2714454171:2714454171(0) ack 1525719341 win 5552 <mss
1400,sackOK,timestamp 9334616 5188436,nop,wscale 2>
0x0000: 003e 8140 4500 003c 0000 4000 4006
b968 .>.@E..<..@.@..h
0x0010: c0a8 0001 c0a8 0002 0016 800b a1cb
489b ..............H.
0x0020: 5af0 a12d a012 15b0 aefd 0000 0204
0578 Z..-...........x
0x0030: 0402 080a 008e 6f58 004f 2b54 0103
0302 ......oX.O+T....
21:06:07.774606 MPLS (label 2000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 35450, offset 0,
flags [DF], proto 6, length: 52) 192.168.0.2.32779 >
192.168.0.1.ssh: . [tcp sum ok] ack 1 win 1400
<nop,nop,timestamp 5188437 9334616>
0x0000: 007d 0140 4500 0034 8a7a 4000 4006
2ef6 .}.@E..4.z@.@...
0x0010: c0a8 0002 c0a8 0001 800b 0016 5af0
a12d ............Z..-
0x0020: a1cb 489c 8010 0578 edbf 0000 0101
080a ..H....x........
0x0030: 004f 2b55 008e 6f58
.O+U..oX
21:06:07.776026 MPLS (label 1000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 10181, offset 0,
flags [DF], proto 6, length: 77) 192.168.0.1.ssh >
192.168.0.2.32779: P [bad tcp cksum 8193 (->52a3)!]
1:26(25) ack 1 win 1388 <nop,nop,timestamp 9334618
5188437>
0x0000: 003e 8140 4500 004d 27c5 4000 4006
9192 .>.@E..M'.@.@...
0x0010: c0a8 0001 c0a8 0002 0016 800b a1cb
489c ..............H.
0x0020: 5af0 a12d 8018 056c 8193 0000 0101
080a Z..-...l........
0x0030: 008e 6f5a 004f 2b55 5353 482d 312e
3939 ..oZ.O+USSH-1.99
0x0040: 2d4f 7065 6e53 5348 5f33 2e36 2e31
7032 -OpenSSH_3.6.1p2
0x0050: 0a
21:06:07.976486 MPLS (label 1000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 10183, offset 0,
flags [DF], proto 6, length: 77) 192.168.0.1.ssh >
192.168.0.2.32779: P [bad tcp cksum 8193 (->51da)!]
1:26(25) ack 1 win 1388 <nop,nop,timestamp 9334819
5188437>
0x0000: 003e 8140 4500 004d 27c7 4000 4006
9190 .>.@E..M'.@.@...
0x0010: c0a8 0001 c0a8 0002 0016 800b a1cb
489c ..............H.
0x0020: 5af0 a12d 8018 056c 8193 0000 0101
080a Z..-...l........
0x0030: 008e 7023 004f 2b55 5353 482d 312e
3939 ..p#.O+USSH-1.99
0x0040: 2d4f 7065 6e53 5348 5f33 2e36 2e31
7032 -OpenSSH_3.6.1p2
0x0050: 0a
.
21:06:08.378424 MPLS (label 1000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 10185, offset 0,
flags [DF], proto 6, length: 77) 192.168.0.1.ssh >
192.168.0.2.32779: P [bad tcp cksum 8193 (->5048)!]
1:26(25) ack 1 win 1388 <nop,nop,timestamp 9335221
5188437>
0x0000: 003e 8140 4500 004d 27c9 4000 4006
918e .>.@E..M'.@.@...
0x0010: c0a8 0001 c0a8 0002 0016 800b a1cb
489c ..............H.
0x0020: 5af0 a12d 8018 056c 8193 0000 0101
080a Z..-...l........
0x0030: 008e 71b5 004f 2b55 5353 482d 312e
3939 ..q..O+USSH-1.99
0x0040: 2d4f 7065 6e53 5348 5f33 2e36 2e31
7032 -OpenSSH_3.6.1p2
0x0050: 0a
.
21:06:09.182300 MPLS (label 1000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 10187, offset 0,
flags [DF], proto 6, length: 77) 192.168.0.1.ssh >
192.168.0.2.32779: P [bad tcp cksum 8193 (->4d24)!]
1:26(25) ack 1 win 1388 <nop,nop,timestamp 9336025
5188437>
0x0000: 003e 8140 4500 004d 27cb 4000 4006
918c .>.@E..M'.@.@...
0x0010: c0a8 0001 c0a8 0002 0016 800b a1cb
489c ..............H.
0x0020: 5af0 a12d 8018 056c 8193 0000 0101
080a Z..-...l........
0x0030: 008e 74d9 004f 2b55 5353 482d 312e
3939 ..t..O+USSH-1.99
0x0040: 2d4f 7065 6e53 5348 5f33 2e36 2e31
7032 -OpenSSH_3.6.1p2
0x0050: 0a
.
21:06:10.790058 MPLS (label 1000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 10189, offset 0,
flags [DF], proto 6, length: 77) 192.168.0.1.ssh >
192.168.0.2.32779: P [bad tcp cksum 8193 (->46dc)!]
1:26(25) ack 1 win 1388 <nop,nop,timestamp 9337633
5188437>
0x0000: 003e 8140 4500 004d 27cd 4000 4006
918a .>.@E..M'.@.@...
0x0010: c0a8 0001 c0a8 0002 0016 800b a1cb
489c ..............H.
0x0020: 5af0 a12d 8018 056c 8193 0000 0101
080a Z..-...l........
0x0030: 008e 7b21 004f 2b55 5353 482d 312e
3939 ..{!.O+USSH-1.99
0x0040: 2d4f 7065 6e53 5348 5f33 2e36 2e31
7032 -OpenSSH_3.6.1p2
0x0050: 0a
.
21:06:14.005571 MPLS (label 1000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 10191, offset 0,
flags [DF], proto 6, length: 77) 192.168.0.1.ssh >
192.168.0.2.32779: P [bad tcp cksum 8193 (->3a4c)!]
1:26(25) ack 1 win 1388 <nop,nop,timestamp 9340849
5188437>
0x0000: 003e 8140 4500 004d 27cf 4000 4006
9188 .>.@E..M'.@.@...
0x0010: c0a8 0001 c0a8 0002 0016 800b a1cb
489c ..............H.
0x0020: 5af0 a12d 8018 056c 8193 0000 0101
080a Z..-...l........
0x0030: 008e 87b1 004f 2b55 5353 482d 312e
3939 .....O+USSH-1.99
0x0040: 2d4f 7065 6e53 5348 5f33 2e36 2e31
7032 -OpenSSH_3.6.1p2
0x0050: 0a
.
21:06:20.436593 MPLS (label 1000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 10193, offset 0,
flags [DF], proto 6, length: 77) 192.168.0.1.ssh >
192.168.0.2.32779: P [bad tcp cksum 8193 (->212c)!]
1:26(25) ack 1 win 1388 <nop,nop,timestamp 9347281
5188437>
0x0000: 003e 8140 4500 004d 27d1 4000 4006
9186 .>.@E..M'.@.@...
0x0010: c0a8 0001 c0a8 0002 0016 800b a1cb
489c ..............H.
0x0020: 5af0 a12d 8018 056c 8193 0000 0101
080a Z..-...l........
0x0030: 008e a0d1 004f 2b55 5353 482d 312e
3939 .....O+USSH-1.99
0x0040: 2d4f 7065 6e53 5348 5f33 2e36 2e31
7032 -OpenSSH_3.6.1p2
0x0050: 0a
.
21:06:29.122144 arp who-has 192.168.0.2 tell
192.168.0.1
0x0000: 0001 0800 0604 0001 000c f16e e562
c0a8 ...........n.b..
0x0010: 0001 0000 0000 0000 c0a8 0002
............
21:06:29.122395 arp reply 192.168.0.2 is-at
00:12:3f:fc:ab:e9
0x0000: 0001 0800 0604 0002 0012 3ffc abe9
c0a8 ..........?.....
0x0010: 0002 000c f16e e562 c0a8 0001 0000
0000 .....n.b........
0x0020: 0000 0000 0000 0000 0000 0000 0000
..............
21:06:33.298637 MPLS (label 1000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 10195, offset 0,
flags [DF], proto 6, length: 77) 192.168.0.1.ssh >
192.168.0.2.32779: P [bad tcp cksum 8193 (->eeeb)!]
1:26(25) ack 1 win 1388 <nop,nop,timestamp 9360145
5188437>
0x0000: 003e 8140 4500 004d 27d3 4000 4006
9184 .>.@E..M'.@.@...
0x0010: c0a8 0001 c0a8 0002 0016 800b a1cb
489c ..............H.
0x0020: 5af0 a12d 8018 056c 8193 0000 0101
080a Z..-...l........
0x0030: 008e d311 004f 2b55 5353 482d 312e
3939 .....O+USSH-1.99
0x0040: 2d4f 7065 6e53 5348 5f33 2e36 2e31
7032 -OpenSSH_3.6.1p2
0x0050: 0a
.
21:06:42.916901 MPLS (label 2000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 35452, offset 0,
flags [DF], proto 6, length: 52) 192.168.0.2.32779 >
192.168.0.1.ssh: F [tcp sum ok] 1:1(0) ack 1 win 1400
<nop,nop,timestamp 5223582 9334616>
0x0000: 007d 0140 4500 0034 8a7c 4000 4006
2ef4 .}.@E..4.|@.@...
0x0010: c0a8 0002 c0a8 0001 800b 0016 5af0
a12d ............Z..-
0x0020: a1cb 489c 8011 0578 6475 0000 0101
080a ..H....xdu......
0x0030: 004f b49e 008e 6f58
.O....oX
21:06:42.917406 MPLS (label 1000, exp 0, [S], ttl 64)
IP (tos 0x0, ttl 64, id 10197, offset 0,
flags [DF], proto 6, length: 52) 192.168.0.1.ssh >
192.168.0.2.32779: F [tcp sum ok] 26:26(0) ack 2 win
1388 <nop,nop,timestamp 9369765 5223582>
0x0000: 003e 8140 4500 0034 27d5 4000 4006
919b .>.@E..4'.@.@...
0x0010: c0a8 0001 c0a8 0002 0016 800b a1cb
48b5 ..............H.
0x0020: 5af0 a12e 8011 056c db19 0000 0101
080a Z......l........
0x0030: 008e f8a5 004f b49e
.....O..
--------------
Best regards.
_______________________________________________________
Yahoo! doce lar. Faça do Yahoo! sua homepage.
http://br.yahoo.com/homepageset.html
|
