James,
Whatever you did fixed my access problem.  I can now get to the PICLIST
website...  HOORAY!!!!!!
Carey

Carey Fisher, Chief Technical Officer
New Communications Solutions, LLC
careyfisher@ncsradio.com
Toll Free Phone:888-883-5788
Local Phone:770-814-0683
FAX: 888-883-5788
www.ncsradio.com


   > -----Original Message-----
   > From: piclist-bounces@mit.edu
   > [mailto:piclist-bounces@mit.edu]On Behalf Of James Newton, Host
   > Sent: Thursday, August 04, 2005 8:49 PM
   > To: 'Microcontroller discussion list - Public.'
   > Subject: RE: [ADMIN]: URLs being stripped from PICList.com archive?
   >
   >
   >
   >  Hector Martin says:
   > > Anyone with a 1500 MTU through all the path will always see
   > your site.
   > > But if your server is configured wrong, or your router, or
   > > something at your end is breaking PMTU discovery, packets can
   > > get dropped forever at places where the MTU is lower. I think
   > > it is not strange for most people to have a 1500 path MTU,
   > > since it is the most optimal, but some people might have
   > > smaller limits. And those might be broken.
   > > Via anonymizer the connection is pretty much rewritten, since
   > > everything goes out and back into the TCP stack at
   > > application level, so if the anonymizer is configured
   > > properly and does PMTU properly, and has a 1500 MTU path to
   > > your server, it will work for everyone.
   >
   > Ok... I can see what you are saying... Lets take that as the best
   > possibility and troubleshoot it.
   >
   > > > I have a linksys router on the front end of the server and
   > > it does not
   > > > have much in the way of settings for MTU related issues.
   > > The only one
   > > > is "automatic / manual MTU size" and if manual, then what
   > size MTU.
   > > > Currently, it is on automatic and it has been like that for
   > > years. So
   > > > if there is a problem, it must be a bug in the linksys or some bug
   > > > between the linksys and the NT 4 / IIS 4 server. So far, I
   > > can't find
   > > > any mention of such a bug related to the linksys model I
   > > have on the internet or at the linksys site.
   > > > However they do have a firmware update which I will apply
   > > as soon as I
   > > > can make sure I have another unit ready to drop in if this
   > > one doesn't
   > > > survive the firmware load.
   >
   > I've just completed the router firmware upgrade...
   >
   > ...could I impose on you to check it again? Did that fix the problem?
   >
   > > If the problem is on your side, it is definitely a bug or big
   > > misconfiguration. A question: is your server under a publicly
   > > routable IP address directly, or does the router use a
   > > forwarding feature to forward port 80 to the server? That
   > > might have something to do with it.
   >
   > The router forwards port 80 to the server on the internal network.
   >
   > > A quick test should be to turn off PMTU discovery and let NT4
   > > unset the DF bit. This is sub-optimal since it will cause
   > > packet fragmentation for paths with a smaller MTU, but it
   > > will not cause any additional load for your connection (since
   > > the packets get fragmented at the router with a smaller MTU),
   > > and it might be an acceptable long-term solution if nothing
   > > else fixes the problem. The site might be 20% slower for
   > > those under lower-MTU connections, but I guess that's better
   > > than not being able to access it at all.
   >
   > I'll try that if the router firmware upgrade doesn't work.
   >
   > ---
   > James Newton: PICList webmaster/Admin
   > mailto:jamesnewton@piclist.com  1-619-652-0593 phone
   > http://www.piclist.com/member/JMN-EFP-786
   > PIC/PICList FAQ: http://www.piclist.com
   >
   >
   >
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