This is starting to really annoy me. My laptop wireless refuses to properly talk to the wireless router. But where the problem is completely beats me. Certain web sites, such as google, work no problem. Other web sites, notably LJ, work for a bit and then resolutely refuse to work for ages, even though the rest of the web is working just fine.

This has me perplexed. Anybody have any pointers as to how to find out what's going wrong?

Edit: will try advice given here

From: [identity profile] brucec.livejournal.com


What about it refuses to work - do you get DNS errors, server timeouts or something else? If you get DNS errors, could the router be running a caching server and dying after a while? If so, try bypassing the router's DNS and manually setting your laptop to use your ISP's DNS server.

If you get server timeouts, could there be a routing problem, such as the router being over-zealous in its firewalling and blocking ICMP packets? I don't know if it's still the case, but from what I understand some products block ICMP Don't Fragment packets which can cause failures with some sites but not others. I don't know if would cause a certain site to work some of the time but not others, though.

If you can't figure it out, the next step is probably to get some tcpdump files and try and figure out what part of the connection is breaking.
ext_79424: Line drawing of me, by me (Default)

From: [identity profile] spudtater.livejournal.com


See, the weird thing is that other computers in the house have no problem...

...actually, my desktop (which I have just had to move to right now) used to have the same problem, but now doesn't.

I'm stumped.

From: [identity profile] brucec.livejournal.com


Are they all using the same configuration - DNS server, web browser, OS etc.?

From: [identity profile] brucec.livejournal.com


When you get the DNS failures (I presume this is what you're seeing) can you ping the server's IP address? Does running a tracert (traceroute) show any failures along the way? Are all the latest patches from Windows Update installed? Could it be malware - are you running Windows Defender?
ext_79424: Line drawing of me, by me (Default)

From: [identity profile] spudtater.livejournal.com


$ ping www.livejournal.com
PING www.livejournal.com (204.9.177.18): 56 data bytes
64 bytes from 204.9.177.18: icmp_seq=1 ttl=240 time=1172 ms
64 bytes from 204.9.177.18: icmp_seq=3 ttl=241 time=1235 ms
64 bytes from 204.9.177.18: icmp_seq=4 ttl=241 time=1281 ms
64 bytes from 204.9.177.18: icmp_seq=5 ttl=240 time=875 ms
64 bytes from 204.9.177.18: icmp_seq=8 ttl=241 time=1016 ms
64 bytes from 204.9.177.18: icmp_seq=9 ttl=240 time=719 ms
64 bytes from 204.9.177.18: icmp_seq=10 ttl=240 time=1063 ms
64 bytes from 204.9.177.18: icmp_seq=11 ttl=241 time=297 ms
64 bytes from 204.9.177.18: icmp_seq=12 ttl=241 time=719 ms

----www.livejournal.com PING Statistics----
13 packets transmitted, 9 packets received, 30.8% packet loss
round-trip (ms)  min/avg/max/med = 297/931/1281/1016


$ tracert www.livejournal.com

Tracing route to www.livejournal.com [204.9.177.18]
over a maximum of 30 hops:

  1     2 ms     1 ms     1 ms  192.168.123.254
  2    23 ms    11 ms    24 ms  10.124.64.1
  3    27 ms    12 ms     9 ms
then pauses for several seconds; full traceroute is finally:
$ tracert www.livejournal.com

Tracing route to www.livejournal.com [204.9.177.18]
over a maximum of 30 hops:

  1     2 ms     1 ms     1 ms  192.168.123.254
  2    23 ms    11 ms    24 ms  10.124.64.1
  3    27 ms    12 ms     9 ms  80.195.0.5
  4    52 ms    24 ms    39 ms  pc-62-30-251-218-ro.blueyonder.co.uk [62.30.251.
218]
  5    29 ms    33 ms    33 ms  194.117.136.213
  6    26 ms    20 ms    35 ms  194.117.136.169
  7    48 ms    49 ms    52 ms  194.117.136.166
  8    29 ms    39 ms    29 ms  bcs1-so-3-0-0.londonlnx.savvis.net [206.24.169.1
73]
  9    50 ms    35 ms    24 ms  bcs2-as0-0.Londonlnx.savvis.net [204.70.193.202]

 10    23 ms    25 ms    28 ms  so5-1-0-622M.ar3.LON2.gblx.net [64.215.195.69]
 11   189 ms   180 ms   189 ms  ge2-1-10G.ar5.PAO2.gblx.net [67.17.66.222]
 12   180 ms   237 ms   184 ms  SIX-APART-LTD.ae0.402.ar2.PAO2.gblx.net [64.210.
19.210]
 13   174 ms   197 ms   170 ms  v102-sf-core2.sixapart.com [204.9.176.20]
 14   193 ms   178 ms   172 ms  livejournal.com [204.9.177.18]

Trace complete.

From: [identity profile] brucec.livejournal.com


So I presume that when you did that you could access LJ, since you appear to have full connectivity?
ext_79424: Line drawing of me, by me (Default)

From: [identity profile] spudtater.livejournal.com


Nope. At the point where I did the ping, every page I was trying to load kept timing out. Then slowly got better, until I could finally post that comment above!

From: [identity profile] brucec.livejournal.com


OK, that really is bizarre. I have no idea what could be causing it - the only thing that sounds vaguely similar is the TCP Window Scaling option that's enabled in Windows Vista, but since you're not running Vista it can't be that.

From: [identity profile] stormsearch.livejournal.com


Being not-so-techy as your good self, I'm sorry I can't offer any solutions. But, you are not completely alone; my laptop (Wildcat) has not dissimilar issues with my wireless router. Oddly, it is specifically my router. This statement is based on the fact that Wildcat had hiccups in my old flat. She was fine for the three months I was living at my parents - with a different router - and now I'm living in my flat with the same router as I had in my old flat, she has hiccups again.

The wonderful, mysterious World of Wireless Connections.

Hope you get it sorted out!
.

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