| View previous topic :: View next topic |
| Author |
Message |
cyrillic
Watchman
Joined: 19 Feb 2003
Posts: 7313
Location: Groton, Massachusetts USA
|
 Posted: Thu Feb 21, 2008 9:35 pm Post subject: 2.6.25-rc* breaks PMTU discovery ? |
 |
|
I noticed this shortly after a kernel upgrade to 2.6.25-rc2
Tracepath dies on the first hop, unless I manually use a small enough packet.
| Code: | # tracepath -l 1500 www.kernel.org
1: calamari.local (192.168.9.1) 0.113ms
2: L100.VFTTP-34.BSTNMA.verizon-gni.net (71.174.53.1) 7.143ms asymm 3
3: P9-2.LCR-04.BSTNMA.verizon-gni.net (130.81.49.130) 7.448ms
4: so-7-0-0-0.PEER-RTR1.NY111.verizon-gni.net (130.81.17.131) 17.356ms asymm 7
5: po2-0.core01.jfk05.atlas.cogentco.com (154.54.11.45) 17.440ms asymm 7
6: te4-1.mpd01.jfk05.atlas.cogentco.com (154.54.1.153) 16.164ms asymm 8
7: vl3495.ccr04.jfk02.atlas.cogentco.com (154.54.6.45) 17.362ms asymm 9
8: te8-3.ccr02.ord01.atlas.cogentco.com (154.54.7.206) 39.959ms asymm 9
9: te4-2.ccr02.mci01.atlas.cogentco.com (154.54.6.253) 67.401ms asymm 14
10: te2-4.ccr02.sfo01.atlas.cogentco.com (154.54.24.109) 239.986ms asymm 12
11: te3-4.ccr01.sfo04.atlas.cogentco.com (154.54.2.90) 177.401ms asymm 13
12: isc.sfo01.atlas.cogentco.com (154.54.11.179) 94.912ms asymm 15
13: no reply
14: no reply
15: int-0-1-0.r1.pao1.isc.org (149.20.65.21) 93.162ms asymm 11
16: pub2.kernel.org (204.152.191.37) 94.955ms reached
Resume: pmtu 1500 hops 16 back 53 |
Everything else related to networking seems to work fine, and if I downgrade the kernel to 2.6.24.2 (or earlier), then tracepath works fine too.
Can anyone explain what happened, or am I the only one experiencing this ? |
|
| Back to top |
|
 |
-Craig-
Guru
Joined: 03 Jun 2004
Posts: 333
|
| Posted: Sat Feb 23, 2008 10:50 pm Post subject: |
|
|
| Maybe you'd rather file a kernel bug or search kernel.org, ask the kernel mailing-lists?! |
|
| Back to top |
|
|
-Craig-
Guru
Joined: 03 Jun 2004
Posts: 333
|
| Posted: Mon Feb 25, 2008 10:19 pm Post subject: |
|
|
| It read that there occured some networking problems in 2.6.25 which were fixed now. Maybe you retry with a newer Kernel? |
|
| Back to top |
|
|
cyrillic
Watchman
Joined: 19 Feb 2003
Posts: 7313
Location: Groton, Massachusetts USA
|
| Posted: Tue Feb 26, 2008 4:41 pm Post subject: |
|
|
I am running 2.6.25-rc3 now, and the situation is the same (pmtu problems with tracepath).
I was hoping that some networking gurus would be reading through the forums, and would understand what is happening. Maybe it is a feature rather than a bug ? |
|
| Back to top |
|
|
|
Networking & Security
