WRT54G: can't access a particular range of internet IP addresses

We have a WRT54G (hardware v6) which we have used for a couple years in conjunction with a cable modem to make a home wifi network. In the past few days, we've been unable to access any sites in the IP range 130.160.x.x (that is, those at The University of Alabama). A particular example is ua.edu (130.160.4.131). The rest of the internet works fine.
This is on Ubuntu 12.04, Windows 7, or Android ICS; with Chrome, Firefox, IE9, or SSH. If I connect the modem to an Ubuntu laptop directly by USB, I can get to ua.edu just fine.
I tried resetting the router to factory defaults, upgrading the firmware, connecting via ethernet rather than wifi, and using the Google DNS servers 8.8.8.8 and 8.8.4.4 in the router, but the problem persists. Naturally, UA's helpdesk, Comcast, and Linksys were all either useless, helpless, or uncooporative.
Traceroute looks like this:
tsbertalan@hustlenbustle:~$ traceroute ua.edu
traceroute to ua.edu (130.160.4.131), 30 hops max, 60 byte packets
1 192.168.1.1 (192.168.1.1) 2.972 ms 10.518 ms 10.979 ms
2 * * *
3 te-9-3-sr02.gadsden.al.tusca.comcast.net (68.85.205.121) 21.529 ms 22.001 ms 22.432 ms
4 te-7-3-ar02.huntsville.al.hunts.comcast.net (68.85.205.57) 23.350 ms 32.048 ms 32.432 ms
5 xe-5-1-0-0-ar01.b0atlanta.ga.atlanta.comcast.net (68.85.109.221) 34.972 ms 35.433 ms 36.119 ms
6 pos-3-5-0-0-cr01.atlanta.ga.ibone.comcast.net (68.86.93.125) 37.672 ms 23.108 ms pos-3-6-0-0-cr01.atlanta.ga.ibone.comcast.net (68.86.93.201) 22.178 ms
7 pos-0-3-0-0-pe01.56marietta.ga.ibone.comcast.net (68.86.87.134) 25.761 ms 26.809 ms 26.300 ms
8 * * te4-2.ccr01.atl02.atlas.cogentco.com (154.54.10.233) 132.485 ms
9 te0-2-0-5.mpd22.atl01.atlas.cogentco.com (154.54.83.209) 29.493 ms te0-3-0-3.ccr21.atl01.atlas.cogentco.com (154.54.83.181) 28.450 ms te0-2-0-5.mpd22.atl01.atlas.cogentco.com (154.54.83.209) 28.892 ms
10 te3-2.ccr01.atl04.atlas.cogentco.com (154.54.82.114) 191.126 ms te9-2.ccr01.atl04.atlas.cogentco.com (154.54.82.122) 192.406 ms te3-1.ccr01.atl04.atlas.cogentco.com (154.54.82.118) 191.817 ms
11 38.104.182.10 (38.104.182.10) 34.520 ms 35.561 ms 36.035 ms
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
tsbertalan@hustlenbustle:~$
Any ideas?
Solved!
Go to Solution.

Interesting, but that seemed to be unconclusive for them. Anyway, the fact that, for that asker, only one computer behind the router was having problems (whereas for me all computers behind the router are having problems) suggests that the problem is different.
FWIW:
tsbertalan@hustlenbustle:~$ telnet cs.ua.edu 80
telnet: Unable to connect to remote host: Connection timed out
C/V:
tsbertalan@hustlenbustle:~$ ping ua.edu
PING ua.edu (130.160.4.131) 56(84) bytes of data.
(after 5 minutes, this is still all it says)
However, from a different server (in California):
tsbertalan@boogeyman ~ $ ping ua.edu
PING ua.edu (130.160.4.131) 56(84) bytes of data.
64 bytes from 130.160.4.131: icmp_req=1 ttl=238 time=112 ms
(etc.)
And also:
tsbertalan@boogeyman ~ $ ssh bama.ua.edu
[email protected]'s password:
Last login: Fri Aug 3 21:12:46 2012 from adsl-76-230-21-
Sun Microsystems Inc. SunOS 5.9 Generic May 2002
bash-2.05$

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WRT54G: can't access a particular range of internet IP addresses

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