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Posts: 5
Registered: ‎08-03-2012
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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?

Expert
Posts: 2,736
Registered: ‎07-07-2012

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

Posts: 5
Registered: ‎08-03-2012

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

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

tsbertalan@bama.ua.edu'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$

 

Expert
Posts: 2,736
Registered: ‎07-07-2012

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

[ Edited ]

http://articles.businessinsider.com/2011-08-22/news/29978491_1_ip-address-chinese-software-cyber-att...

 

I can't explain.  FBI agents blocking you? NSA?  Mistaken identity? No clue.

Posts: 1,206
Registered: ‎05-04-2012

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

 

Hi there,

 

You may also try to disable your 3rd party firewall on the affected computer.

On the router, open port 80 and 443 (tcp/udp).

Or, try to use a different internet browser.

Posts: 5
Registered: ‎08-03-2012

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

[ Edited ]

jlbjlb:

That was pretty funny, and interestingly appropriate. UAB is in a different city, though, and we can get to their sites fine.

 

ylime1984:

As I said, I used Ubuntu 12.04, Windows 7, or Android ICS, using the browsers Chrome, Firefox, IE9, and the Android browser, and non-browser programs like SSH, so brower and firewall shouldn't be a problem.

Also, in the "Access Restrictions" page in the router admin, there are no enabled policies.

 

I've heard a bit about port 443 being a possible problem, but

  1. SSH (here) uses port 22
  2. I'm not yet trying to use https on any UA sites
  3. https (and, of course, http) both work fine on other sites

Still, how would I go about checking that these ports are open?  I can only find port-related options for inbound connections (that is, the "Applications & Gaming" tab).

Expert
Posts: 2,736
Registered: ‎07-07-2012

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

That was an interesting uab(Birmingham)article. Seriously though, what you have in common with the gentleman who also couldn't access some uab site (with one machine) is you both are advanced users. I think that is where you will ultimately find the common thread and solution.

I'm more of a slightly above average user. And I had no problem accessing the uab site that is giving you trouble using AT&T default southeast dns server. But I don't run anything very complex on my system or network. Microsoft security essentials, windows firewall, and everything sits behind a single nat router relying on UPnP. I don't even have my NAS running anymore.

Posts: 2,157
Registered: ‎05-29-2012

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

Just make sure that your computer will be able to access those websites when connected to the modem. Just to isolate the problem.

Posts: 5
Registered: ‎08-03-2012

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

Yes, that's a good suggestion. I did check without the router, and the internet for all sites does work then. I was actually surprised at how easy it was to connect the modem by USB to my Ubuntu laptop.

Still, the problem is only confirmed to be in the router.
Expert
Posts: 2,736
Registered: ‎07-07-2012

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

I would probably just pick up a cheap router and see if it works rather than investing too much time on it. That would be the best way to isolate it.

You could pick a refurb router off the linksys store pretty cheap. It's never a bad idea to have a backup router anyway.

I'll humor you with my last guess besides FBI or NSA. Someone in your family or a neighbor is an auburn fan and they accessed your router's GUI and blocked the site using the parental controls. That's my final guess. Smiley Happy