Verizon transparent web caching issue? WASRe: Data Center QoS equipment breaking http 1.1?

up at 3.am up at 3.am
Fri Jul 31 20:06:03 CDT 2009


Again, turned out to be my own stupidity.  It was just DNS on a secondary 
DNS server, which was pointing to the old IP, which was redirecting to the 
new IP, but at that point, the headers are lost.

I would have thought that on MacOSX (my client; the server is FreeBSD 
7.2-STABLE), if I tell the /etc/resolv.conf to look at the primary name 
server only, which has the correct info, plus doing a dnscacheutil 
-flushcache, that this wouldn't be an issue.

Apparently, I was wrong, or perhaps it doesn't override what Verizon does 
with my browser's queries, despite what nslookup shows in a terminal 
window.

On Fri, 31 Jul 2009, up at 3.am wrote:

>
> Disregard my disregard.  The problem resurfaced with no changes on my part. 
> I purged browser caches and tried them from 3 browsers and each time:
>
> http://www.countytheater.org
>
> redirected to:  http://webmail.ns3.pil.net/ which is another NameVhost on 
> that server sharing that IP.  This is incorrect.  However, I then switch from 
> a Verizon connection to an ATT 3g connection on the IPhone and the problem 
> goes away.
>
> Has anyone heard of upstream transparent caching issues causing this kind of 
> problem?  Does anyone else here get the redirect instead of the correct page?
>
> TIA
>
> On Fri, 31 Jul 2009, up at 3.am wrote:
>
>> 
>> Please disregard this idiocy of mine...it appears that the Apache 
>> UseCanonicalName directive selectively breaks some NameVirtualHosts, while 
>> leaving others unscathed, but turning it off fixed it anyway.
>> 
>> On Fri, 31 Jul 2009, up at 3.am wrote:
>> 
>>> 
>>> Sorry if this is a little OT, but we're seeing a serious problem and was 
>>> wondering if it is what I think it is.
>>> 
>>> In short: I have been moving services off of our servers in a data center 
>>> onto a server at eSecuredata, who rents dedicated servers.  The idea is to 
>>> lower costs and eliminate having to deal with hardware.
>>> 
>>> The advertise "unmetered bandwidth", but mention QoS measure to control 
>>> "bandwidth hogs".
>>> 
>>> One of my customers, whose site I just moved from a unique IP virtual host 
>>> on my old server onto an Apache NameVirtualHost on the new one, worked 
>>> fine at first.  Then today, they started complaining about getting one of 
>>> our home pages.  I figured DNS or web caching issues, until I started 
>>> seeing it for myself.  It was no caching issue, it was NameVirtualHost 
>>> breaking.
>>> 
>>> I poured over my configs (I've done this config countless times), and saw 
>>> this in the apache docs:
>>> 
>>> http://httpd.apache.org/docs/2.2/vhosts/name-based.html
>>> 
>>> " Some operating systems and network equipment implement bandwidth 
>>> management techniques that cannot differentiate between hosts unless they 
>>> are on separate IP addresses."
>>> 
>>> So, I installed lynx on the server, and sure enough, it worked perfectly 
>>> fine there, just not from anywhere outside eSecuredata's network that I 
>>> could see.
>>> 
>>> Can anyone shed any light on this particular practice, of this company in 
>>> particular?
>>> 
>>> thanks
>>> 
>>> James Smallacombe		      PlantageNet, Inc. CEO and Janitor
>>> up at 3.am http://3.am
>>> =========================================================================
>>> 
>> 
>> James Smallacombe		      PlantageNet, Inc. CEO and Janitor
>> up at 3.am 
>> http://3.am
>> =========================================================================
>> 
>> 
>
> James Smallacombe		      PlantageNet, Inc. CEO and Janitor
> up at 3.am							    http://3.am
> =========================================================================
>

James Smallacombe		      PlantageNet, Inc. CEO and Janitor
up at 3.am							    http://3.am
=========================================================================




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