[Gllug] Weird network behaviour

[Rich Walker]

This one is baffling me.

I have a box at work with a 40MB email waiting for me. Fetchmail is
downloading it at the rate of one small burst of data every 30s or more.

The setup is: laptop -> wireless -> router -> adsl -> internet -> adsl
-> router -> ethernet ->server

When I ping the server, i suddenly get almost continuous transmission of
data to fetchmail.

Typical ping output:
64 bytes from 84.45.206.219: icmp_seq=139 ttl=54 time=1018.5 ms
64 bytes from 84.45.206.219: icmp_seq=140 ttl=54 time=1027.5 ms
64 bytes from 84.45.206.219: icmp_seq=141 ttl=54 time=38.7 ms
64 bytes from 84.45.206.219: icmp_seq=142 ttl=54 time=1060.7 ms
64 bytes from 84.45.206.219: icmp_seq=143 ttl=54 time=1010.1 ms
64 bytes from 84.45.206.219: icmp_seq=144 ttl=54 time=1014.1 ms
64 bytes from 84.45.206.219: icmp_seq=145 ttl=54 time=1010.4 ms
64 bytes from 84.45.206.219: icmp_seq=146 ttl=54 time=26.6 ms
64 bytes from 84.45.206.219: icmp_seq=147 ttl=54 time=30.8 ms
64 bytes from 84.45.206.219: icmp_seq=148 ttl=54 time=38.6 ms

If I stop the ping, the connection drops to "pitiful" again.

Traceroute looks like:

traceroute to shadowrobot.dnsalias.org (84.45.206.219), 30 hops max, 40 byte packets
 1  192.168.123.254 (192.168.123.254)  2.997 ms  2.511 ms  2.724 ms
 2  * gsr01-hr.blueyonder.co.uk (62.30.144.33)  34.359 ms *
 3  pc-62-30-250-10-ha.blueyonder.co.uk (62.30.250.10)  33.519 ms  49.224 ms  103.751 ms
 4  * tele2-har-pos.telewest.net (194.117.136.26)  73.126 ms *
 5  linx-gw1.enta.net (195.66.226.151)  130.830 ms *  56.106 ms
 6  telehouse-east2.core.enta.net (84.45.193.196)  1279.980 ms  973.691 ms  1005.030 ms
 7  gw2.dsl.enta.net (62.249.192.126)  43.975 ms  99.573 ms  808.103 ms
 8  gw1.dsl.enta.net (62.249.255.161)  43.877 ms  48.805 ms  64.905 ms
 9  lns10.dsl.enta.net (62.249.255.133)  891.087 ms  958.085 ms  1006.589 ms
10  84-45-206-217.no-dns-yet.enta.net (84.45.206.217)  1002.898 ms  1000.682 ms  33.663 ms
11  * * *

Anyone got any ideas?

cheers, Rich. 

-- 
rich walker | technical person | Shadow Robot Company | rw at shadow.org.uk
front-of-tshirt space to let     251 Liverpool Road   |
                                 London  N1 1LX       | +UK 20 7700 2487
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