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RE: web pages not loading (from certain networks) but not a routi ng i ssue.
From: "Young, Jason" <Jason.Young () anheuser-busch com>
Date: Fri, 7 Sep 2001 10:00:32 -0500



This reeks of an MTU problem somewhere.

Did you happen to have ICMP filtered to/from your sites recently? Remember, ICMP
isn't just that protocol that lets you ping stuff. You may have broken path MTU
discovery.

Jason Young
CNS - Network Design, Anheuser-Busch
(314)577-4597



-----Original Message-----
From: Nanog [mailto:Nanog () exchange ware net]
Sent: Friday, September 07, 2001 9:52 AM
To: nanog () merit edu
Subject: web pages not loading (from certain networks) but 
not a routing
i ssue.



Ok guys,

Interesting problem that seems to have started on Friday.

Here's the deal, it seems that certain (not all) web pages on 
various sites
we host are not loading for certain customers. It started on 
Friday with
visitors on Verizon DSL waiting forever for pages to load.

Yesterday and today PacBell DSL and some Netcom customers started
complaining.

This only seems to occur on HTTP traffic. If we have the 
visitors try HTTPS
the pages load fine (with the normal encryption slowdown). 

We've looked at Layers 1-4, and can't see any problems, ping 
looks great,
interfaces and cpus on routers, servers and switches look fine.

It's almost like it's a transparent cache "bug". Anyone know 
if Inktomi, or
any major cache vendors rolled out any new code this week?

For that matter does anyone know what caches Verizon and SBC use for
starters?

Other variables: it only seems to occur on IIS based systems 
(I know I know,
no flame wars or suggestions for replacements). Although it's 
not happening
on all of our IIS servers.

Any clues are greatly appreciated.

Steve




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