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Groups > comp.os.linux.misc > #12031
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Newsgroups | comp.os.linux.misc |
| Subject | Re: weirdness with TCP timeouts? |
| Date | 2014-09-08 17:54 +0100 |
| Organization | albasani.net |
| Message-ID | <lukmvp$bhu$1@news.albasani.net> (permalink) |
| References | <luk078$pfl$1@news.albasani.net> <le21eb-5e8.ln1@squidward.local.dionic.net> |
On 08/09/14 17:35, Tim Watts wrote: > On 08/09/14 11:25, The Natural Philosopher wrote: > >> The second issue was that ssh sessions to my remote server were timing >> out. They never used to, but I pulled the ssh keepalive down to a couple >> of minutes and now the session stays up. > > As that is possibly a reproducible and simple problem, could you put the > timeout up and run a tcpdump against it until it dies and see if > anything happens at the end? > Mmm tcpdump is a thought. as is netstat.. netstat -a | grep ESTABLISHED tcp 0 0 192.168.0.6:37903 my.private.server:ssh ESTABLISHED tcp 0 0 192.168.0.6:55445 four.schnuerpel.eu:nntp ESTABLISHED tcp 0 0 192.168.0.6:667 tempest:nfs ESTABLISHED tcp 0 0 192.168.0.6:55463 four.schnuerpel.eu:nntp ESTABLISHED tcp6 0 0 ip6-localhost:41281 ip6-localhost:ipp ESTABLISHED tcp6 0 0 ip6-localhost:ipp ip6-localhost:41281 ESTABLISHED That shows that t'bird IS keeping nntp alive. My guess is that the far end or the local end is timing out... MM. a few other other connections have popped up there in later scans. I wonder WTF is going on.. >> That is in some way sockets are being closed inside the kernel in ways >> they shouldn't be. And applications are not being notified that they >> have closed. >> >> IN short my fevered imagination is considering the possibility that TCP >> timeouts in the kernel have changed in unexpected ways, so that >> connections that used to exist, have been silently dropped. > > Not aware of anyhing which means bugger all here - > > Just one observation - have you changed the device that provides your > NAT (if any) to the internet recently? NAT clearing sessions could cause > these symptoms No, that's been the same throughout. -- Everything you read in newspapers is absolutely true, except for the rare story of which you happen to have first-hand knowledge. – Erwin Knoll
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weirdness with TCP timeouts? The Natural Philosopher <tnp@invalid.invalid> - 2014-09-08 11:25 +0100
Re: weirdness with TCP timeouts? Tim Watts <tw_usenet@dionic.net> - 2014-09-08 17:35 +0100
Re: weirdness with TCP timeouts? The Natural Philosopher <tnp@invalid.invalid> - 2014-09-08 17:54 +0100
Re: weirdness with TCP timeouts? The Natural Philosopher <tnp@invalid.invalid> - 2014-09-08 18:06 +0100
Re: weirdness with TCP timeouts? Johnny <johnny@invalid.net> - 2014-09-08 13:25 -0500
Re: weirdness with TCP timeouts? The Natural Philosopher <tnp@invalid.invalid> - 2014-09-08 19:27 +0100
Re: weirdness with TCP timeouts? Chick Tower <c.tower@deadspam.com> - 2014-09-19 02:33 +0000
Re: weirdness with TCP timeouts? The Natural Philosopher <tnp@invalid.invalid> - 2014-09-19 06:30 +0100
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