RE: [squid-users] www.cmhc.ca site doesn't load

Adrian,

Thank you for the suggestions, the problem is with timestamping and
window scaling. When I disable both of these, the site works. Now I am
debating whether I should do this or have this single site bypass the
cache entirely.
Disabling timestamping looks like it's no big deal, but disabling window
scaling looks like it stops TCP negotiation of window sizes larger then
64K. I am looking at this as a big negative, but would appreciate your
thoughts as you are more experienced with caching technology.

--
Thanks,
Bryan Shoebottom CCNA
Network & Systems Analyst
Network Services & Computer Operations
Fanshawe College
Phone:  (519) 452-4430 x4904
Fax:  (519) 453-3231
BShoebottom@fanshawec.ca
-----Original Message-----
From: Adrian Chadd [mailto:adrian@creative.net.au] 
Sent: Saturday, February 16, 2008 8:13 AM
To: Shoebottom, Bryan
Cc: Adrian Chadd; squid-users@squid-cache.org
Subject: Re: [squid-users] www.cmhc.ca site doesn't load
On Sat, Feb 16, 2008, Shoebottom, Bryan wrote:
> I thought of this because I've had this problem in the past with sites
> like hotmail.  But when I configure the browser for the cache server
> itself and bypass WCCP, I have the same problem.  I was hoping the
> community would be able to tell me if they have any difficulties with
> this site.  Then I could begin to compare configurations.
Various people have issues with these sorts of things. Generally its
because
of stuff like ECN, PMTU discovery, Window Scaling/Timestamping, etc.
Adrian
> 
> 
> --
> Thanks,
> 
> Bryan Shoebottom CCNA
> Network & Systems Analyst
> Network Services & Computer Operations
> Fanshawe College
> Phone:  (519) 452-4430 x4904
> Fax:  (519) 453-3231
> BShoebottom@fanshawec.ca
> 
> 
> -----Original Message-----
> From: Adrian Chadd [mailto:adrian@creative.net.au] 
> Sent: Friday, February 15, 2008 6:17 PM
> To: Shoebottom, Bryan
> Cc: squid-users@squid-cache.org
> Subject: Re: [squid-users] www.cmhc.ca site doesn't load
> 
> Start by using a packet sniffer and see if you can determine why the
> TCP sessions are hanging.
> 
> It may be WCCPv2 interception. It depends on how you've set it up to
the
> Cat6k.
> 
> 
> 
> Adrian
> 
> On Fri, Feb 15, 2008, Shoebottom, Bryan wrote:
> > Hello,
> > 
> > I am having problems getting to www.cmhc.ca through our cache
servers.
> > We have a 2.6S4 and a 3.0S1 server running transparently with WCCPv2
> and
> > Cisco cat6k equipment.  I have tried to get to the site through the
> > transparent configuration, and with each cache configured in my
> browser,
> > but the site takes a long time to come up (over 10min, I haven't
> stayed
> > around to watch) if it ever completes in any situation.  If I bypass
> the
> > caches completely, I can bring up the site with no problems.
> > There are no errors in cache.log and access.log only shows an entry
> when
> > something finally loads in the browser (i.e. when the icon shows up
> > after 5min, I see the request for favicon.ico).  Since the site
> doesn't
> > load when the browser is configured for a cache, WCCP shouldn't be
the
> > issue.
> > 
> > Can anyone replicate this or have a solution?  If you need any more
> > info, please let me know.
> > 
> > 
> > --
> > Thanks,
> > 
> > Bryan Shoebottom CCNA
> > Network & Systems Analyst
> > Network Services & Computer Operations
> > Fanshawe College
> > Phone:  (519) 452-4430 x4904
> > Fax:  (519) 453-3231
> > BShoebottom@fanshawec.ca
> > 
> 
> -- 
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-- 
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