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Re: Problems with some web sites (tuning?)



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>
>
>---- Original Message ----
>From: carlj@peak.org
>To: debian-user@lists.debian.org
>Subject: Re: Problems with some web sites (tuning?)
>Date: Sat, 28 Mar 2009 15:32:49 -0700
>
>>owens@netptc.net writes:
>>
>>> I don't know what could be causing this but the behavior might
>>> suggest that the packets are undergoing a very high error rate. 
>The
>>> timeout or "lockup" can indicate that the packets cannot be
>>> reassembled at the destination (your computer) and the TCP
>protocol
>>> times out waiting for one or more missing packets.
>>
>>That makes sense to me, but why is it only a very few web sites?  I
>>haven't heard complaints about poor wikipedia access, so it appears
>>that most other people don't have problems with that either.  One
>idea
>>I thought of is that maybe they have very tight timeout limits, and
>>since I am on dialup, I often exceed those limits and they then drop
>>packets.  I have heard about a couple things(ECN and SACK?) that can
>>cause problems with some sites, but I think I already have disabled
>>them in the sysctl.conf settings I included in my original message.
>>
>>Any idea how I could trace something like dropped packets?  Looking
>>for the absence of something can be very difficult if I don't know
>>what I should be looking for.
>>
>>Thanks for your suggestions.
>>-- 
>>Carl Johnson		carlj@peak.org
>>
>>
Oy dial up!  Since others have not seemed to experience this and
since you are on dial-up, this seems to point to your local dial-up
connection-either excessive errors (a possibility) or substantial
delay (also a possibility).  Either one potentially requires (TCP)
retransmission.  A couple of tests to run (the second is a bit
difficult):
1.  Try the difficult web sites in the middle of the night when the
ambient noise (and hence any errors) should be less
2.  Move your computer to another location (a friends house across
town perhaps) and try it from there.
Larry
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