Advice on diagnosing routing problems?

[armb]

I can see some of the net, but not other bits. On Friday I couldn't connect to BT Yahoo webmail either at work or home, but yesterday I could from work but not home. I upgraded the router firmware at home (on the grounds that it wouldn't hurt, though its not as if I'd changed anything recently), and then could connect. But there are still sites I can't ping.

$ tracert www.westroad.org

Tracing route to www.westroad.org [131.111.166.46]
over a maximum of 30 hops:

1 1 ms <1 ms <1 ms www.routerlogin.com [192.168.0.1]
2 12 ms 13 ms 13 ms esr5.ilford5.broadband.bt.net [217.47.23.144]
3 12 ms 13 ms 13 ms 217.47.23.13
4 13 ms 12 ms 13 ms 213.123.78.1
5 14 ms 13 ms 12 ms 217.41.170.66
6 13 ms 13 ms 12 ms 217.41.170.126
7 * * * Request timed out.
...
30 * * * Request timed out.


$ tracert www.google.co.uk

Tracing route to www.l.google.com [66.102.9.104]
over a maximum of 30 hops:

1 <1 ms <1 ms <1 ms www.routerlogin.com [192.168.0.1]
2 13 ms 13 ms 13 ms esr5.ilford5.broadband.bt.net [217.47.23.144]
3 12 ms 13 ms 12 ms 217.47.23.13
4 14 ms 13 ms 13 ms 213.123.78.1
5 13 ms 13 ms 14 ms 217.41.170.66
6 12 ms 13 ms 13 ms 217.41.170.126
7 13 ms 12 ms 13 ms 217.41.170.46
8 12 ms 13 ms 12 ms 213.120.192.178
9 13 ms 12 ms 13 ms s4-ipswich-smds.ukcore.bt.net [194.72.20.105]
10 12 ms 13 ms 13 ms core1-pos13-0.telehouse.ukcore.bt.net [194.74.65
.117]
11 14 ms 12 ms 13 ms linx2.teleglobe.net [195.66.226.51]
12 13 ms 12 ms 13 ms ix-9-2.core2.LDN-London.Teleglobe.net [195.219.6
7.206]
13 24 ms 13 ms 13 ms 72.14.238.246
14 23 ms 23 ms 23 ms 216.239.49.254
15 24 ms 23 ms 23 ms 64.233.174.42
16 26 ms 26 ms 26 ms 64.233.174.18
17 24 ms 23 ms 23 ms 66.102.9.104

Trace complete.


$ ipconfig
Windows IP Configuration
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.0.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.0.1


Router table

Destination 	Mask 	        Gateway 	Metric 	Active
217.47.23.144 	255.255.255.255 0.0.0.0 	0 	Yes
192.168.0.0 	255.255.255.0 	0.0.0.0 	0 	Yes
127.0.0.0 	255.255.0.0 	0.0.0.0 	0 	Yes
239.0.0.0 	255.0.0.0 	0.0.0.0 	0 	Yes
0.0.0.0 	0.0.0.0 	217.47.23.144 	0 	Yes

Any suggestions on finding the problem?
(The home machine with a Linux installation only has an unsupported wireless card.)

Comments

[timill]

That suggests to me that the routing table in 217.41.170.126 is shot. Which would seem to be BT's problem, somewhere between broadband.bt.net and ukcore.bt.net.

[armb.livejournal.com]

It got better.
Alice and I took the dogs for a walk to Grantchester while Nana Pam took the children to a concert.