I've suddenly become unable to access a selection of remote hosts from a
server. These appear to be machines I have been accessing frequently,
but not all frequently accessed machines are blocked. The problem first
appeared Saturday night, and I've rebooted (even powered down) since.
What aspect of networking could cause this behavior?
For example, from server A I can access debian-multimedia.org but not
screwdriver.csua.berkeley.edu (a Debian mirror). From server B on the
same subnet I can access both:
A: ping debian-multimedia.org
PING debian-multimedia.org (91.121.86.213): 56 data bytes
64 bytes from 91.121.86.213: icmp_seq=0 ttl=39 time=170.5 ms
A: ping screwdriver.csua.berkeley.edu
ping screwdriver.csua.berkeley.edu
PING screwdriver.csua.berkeley.edu (128.32.112.231): 56 data bytes
^C
24 packets transmitted, 0 packets received, 100% packet loss
B: ping screwdriver.csua.berkeley.edu
PING screwdriver.csua.berkeley.edu (128.32.112.231) 56(84) bytes of data.
64 bytes from screwdriver.CSUA.Berkeley.EDU (128.32.112.231): icmp_seq=1
ttl=52 time=10.9 ms
Traceroute shows A gets all the way to Soda Hall, but never quite makes
it to screwdriver:
6 lax-hpr1--ucla-10ge.cenic.net (137.164.27.5) 2.974 ms 1.334 ms
1.505 ms
7 * * *
8 * * *
9 hpr-ucb-ge--oak-hpr.cenic.net (137.164.27.130) 10.956 ms 10.776
ms 10.842 ms
10 * * *
11 evans-soda-br-5-4.EECS.Berkeley.EDU (128.32.255.162) 11.136 ms
11.103 ms 11.104 ms
12 appropriate-in.EECS.Berkeley.EDU (169.229.3.82) 11.471 ms 11.378
ms 11.379 ms
13 soda-10g-edge.EECS.Berkeley.EDU (169.229.59.242) 11.925 ms 11.903
ms 15.474 ms
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
B gets there right away, and lists every stops on the way:
6 lax-hpr1--ucla-10ge.cenic.net (137.164.27.5) 3.256 ms 1.243 ms
1.447 ms
7 * svl-hpr--lax-hpr-10ge.cenic.net (137.164.25.13) 10.728 ms *
8 oak-hpr--svl-hpr-10ge.cenic.net (137.164.25.9) 10.788 ms * *
9 hpr-ucb-ge--oak-hpr.cenic.net (137.164.27.130) 11.100 ms 11.024
ms 10.897 ms
10 t2-3.inr-201-eva.Berkeley.EDU (128.32.0.37) 11.110 ms 11.021 ms
10.858 ms
11 evans-soda-br-5-4.EECS.Berkeley.EDU (128.32.255.162) 11.459 ms
11.895 ms 11.674 ms
12 appropriate-in.EECS.Berkeley.EDU (169.229.3.82) 12.281 ms 12.211
ms 12.004 ms
13 soda-10g-edge.EECS.Berkeley.EDU (169.229.59.242) 12.529 ms 12.475
ms 12.283 ms
14 screwdriver.CSUA.Berkeley.EDU (128.32.112.231) 12.125 ms 12.071
ms 11.258 ms
What part of my networking got messed up, and how do I fix it?
Cheers,
David
--
To unsubscribe from this list: send the line "unsubscribe linux-net" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
