On Mon, 08 Nov 2010 12:22:46 -0500 Eloy Paris <pe...@chapus.net> wrote:
> Hi Jacob,
>
> On 11/07/2010 05:24 PM, Jacob Joseph wrote:
>
> [...]
>
> > This does sound reasonable, and explains the intermittent nature. I
> > should note, though, that it sometimes occurs immediately after
> > mounting owfs.
>
> Hhmmm, I don't recall this ever happening to me immediately after
> mounting.
>
> > My logging programs don't use the owfs mounted directory, instead
> > using the owserver through python. I'm not using aliases. I
> > recall reading about your troubles with them, but didn't put it
> > together.
>
> Something you could do to further troubleshoot is to capture traffic
> between owserver and your program using tcpdump -- if you see
> connections being reset (TCP RSTs) or being terminated normally TCP
> FINs) then that may give you something to further investigate. If
> your program and owserver run on the same machine then remember that
> you need to use the loopback interface when capturing...
Eloy, the tcp connection being closed is definitely the cause. There's
a FIN sent by the server after exactly 1 hour idle. I'll take a closer
look in time, but, for now, here are the packets:
last packet before going idle:
18:02:16.751481 IP (tos 0x0, ttl 64, id 43050, offset 0, flags [DF], proto TCP
(6), length 52)
zaru.nuke.56502 > zaru.nuke.4304: Flags [.], cksum 0x477a (incorrect ->
0xd485), seq 26, ack 722, win 513, options [nop,nop,TS val 36893057 ecr
36893057], length 0
0x0000: 4500 0034 a82a 4000 4006 4b46 c0a8 6301 e.....@.@.KF..c.
0x0010: c0a8 6301 dcb6 10d0 7625 71aa 761a 260a ..c.....v%q.v.&.
0x0020: 8010 0201 477a 0000 0101 080a 0232 f181 ....Gz.......2..
0x0030: 0232 f181 .2..
After one hour idle:
19:02:16.929998 IP (tos 0x0, ttl 64, id 50192, offset 0, flags [DF], proto TCP
(6), length 52)
zaru.nuke.4304 > zaru.nuke.56502: Flags [F.], cksum 0x477a (incorrect ->
0x562e), seq 722, ack 26, win 512, options [nop,nop,TS val 37253075 ecr
36893057], length 0
0x0000: 4500 0034 c410 4000 4006 2f60 c0a8 6301 e.....@.@./`..c.
0x0010: c0a8 6301 10d0 dcb6 761a 260a 7625 71aa ..c.....v.&.v%q.
0x0020: 8011 0200 477a 0000 0101 080a 0238 6fd3 ....Gz.......8o.
0x0030: 0232 f181 .2..
19:02:16.969946 IP (tos 0x0, ttl 64, id 43051, offset 0, flags [DF], proto TCP
(6), length 52)
zaru.nuke.56502 > zaru.nuke.4304: Flags [.], cksum 0x477a (incorrect ->
0xd7d1), seq 26, ack 723, win 513, options [nop,nop,TS val 37253079 ecr
37253075], length 0
0x0000: 4500 0034 a82b 4000 4006 4b45 c0a8 6301 e.....@.@.KE..c.
0x0010: c0a8 6301 dcb6 10d0 7625 71aa 761a 260b ..c.....v%q.v.&.
0x0020: 8010 0201 477a 0000 0101 080a 0238 6fd7 ....Gz.......8o.
0x0030: 0238 6fd3 .8o.
upon 'ls':
19:06:50.802956 IP (tos 0x0, ttl 64, id 43052, offset 0, flags [DF], proto TCP
(6), length 78)
zaru.nuke.56502 > zaru.nuke.4304: Flags [P.], cksum 0x4794 (incorrect ->
0x3cad), seq 26:52, ack 723, win 513, options [nop,nop,TS val 37280462 ecr
37253075], length 26
0x0000: 4500 004e a82c 4000 4006 4b2a c0a8 6301 E..N.,@....@.k*..c.
0x0010: c0a8 6301 dcb6 10d0 7625 71aa 761a 260b ..c.....v%q.v.&.
0x0020: 8018 0201 4794 0000 0101 080a 0238 dace ....G........8..
0x0030: 0238 6fd3 0000 0000 0000 0002 0000 0004 .8o.............
0x0040: 0000 0105 0000 0000 0000 0000 2f00 ............/.
19:06:50.803033 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6),
length 40)
zaru.nuke.4304 > zaru.nuke.56502: Flags [R], cksum 0xdee0 (correct), seq
1981425163, win 0, length 0
0x0000: 4500 0028 0000 4000 4006 f37c c0a8 6301 E..(....@.@..|..c.
0x0010: c0a8 6301 10d0 dcb6 761a 260b 0000 0000 ..c.....v.&.....
0x0020: 5004 0000 dee0 0000 P.......
~Jacob
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