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173 posts

Master Geek


Topic # 16424 9-Oct-2007 20:51
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what the *#@%!

I should add this to the "pet peeves" thread that was started a while back - fixing things and not knowing why its working again - after not being able to find out why it broke in the first place!

So woke up this morning to find my connection would happily download some sites, but not others. Hmmm.....the connection is obviously working since I can browse the internet - but why can't I access geekzone. Ok - maybe something is blocking it. Check for malware - nothing. 
Check for spyware - nothing. 
Check for a virus - nothing.
Make sure zonealarm, spybot, virus protection, script blocker, internet settings are not blocking the site, java apps, etc - nothing. Hmmm.....2 hours now gone. 

Unload zone alarm - nothing (put back)
Unload spybot - nothing (put back)
Have coffee - stomp around house consider buying BB gun and postal uniform to shoot at neighbours overgrown rodent excuse for a yappy pet dog!

Edit host file, add IP addresses for affected sites - nothing.
Check DNS setting on PC (windows xp) - ok
Change DNS settings on PC to local free DNS (bypass my ISPs DNS) - nothing
Check router DNS settings (set to relay)
Change to selected ISP DNS - nothing.
Change router - nothing.

Attempt a connection to geekzone (and other blocked sites) via anonymous proxy - success! Hmmm - so connecting back to NZ via europe or the US is ok - but not directly from India to the affected sites.  Check DNS records of affected sites to see if it is one particulare ISP who doesn't like India? - nothing (one is iconz, another is telstra - so not related to the ISP in NZ).

Enter in destination IP of geekzone instead of URL and - viola - now all sites are working.

think I'll shoot the neighbours dog anyway just to feel better. gggrrrrrrrrrr!

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12 posts

Geek


  Reply # 91602 18-Oct-2007 21:12
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I have had the similar issue before.  Those sites that I coundn't browse are all Microsoft's one.  After sometime playing with the ADSL router, I finally found that the MTU set at the WAN interface of my ADSL router was the cause.

The default MTU was 1500, I lowered it to 1492 which then stopped me from be able to access Microsoft's website.  As soon as I put it back to 1500, everything started working fine.

Not sure why Microsoft's servers would have problem talking to my ADSL router with MTU set to 1492.  Possibly 1492 caused fragmented packets which Microsoft's server don't like to talk to.



173 posts

Master Geek


  Reply # 91624 18-Oct-2007 23:38
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yeah I fooled around with the MTU as well - didn't make any difference.  Using the IP address instead of the URL is what got me as that seems to point to a name resolution problem.  So the problem came right (somehow) - its happened again briefly since then - but all ok for the last couple of weeks?  Thanks for the reply.

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