61415465   
   From: m@rtij.nl.invlalid   
      
   On Wed, 18 Nov 2009 18:18:54 -0800, Don wrote:   
      
   > I've been troubleshooting an intermittent network problem for several   
   > days and could use a clue.  I have a high-speed wireless broadband   
   > connection from my ISP.  My router uses PPPoE to connect to the   
   > Internet.  At intervals, I'm unable to load a web page or I only get the   
   > page partially loaded.  When I try loading the page from the command   
   > line using wget, I get a "Network is unreachable" error.  In every case   
   > I'm able to ping the site.  Searching for answers always leads to   
   > instructions for adjusting my MTU settings.   
      
   Thorough analysis, and I cannot make head or tails from it either. Some   
   suggestions:   
      
   - I would start tcpdump and look which host is sending the Network is   
   unreachable error. This may give some clue on where to start searching   
   further.   
      
   - Is there maybe a transparent proxy involved? Does this problem occur on   
   other tcp connections as well or only with http over port 80?   
      
   - Do note that many Linksyses do some form of clamp-mss-to-mtu. If this   
   implementation is broken, it may actually increase the mss so lowering   
   your mtu may not do what you think it does. However, this alone does not   
   explain your problems.   
      
   As it is an intermittent problem, I doubt it is a MTU problem. MTU   
   problems are intermittent because they occur only when packet sizes   
   exceed mtu size. When you do a repeated wget of the same page, you get   
   (roughly) the same stream always and should either always trigger the   
   problem or always succeed. I really, really doubt this is MTU related.   
   Having seen many MTU related problems, I'm actually fairly confident in   
   this, but your problem does not make sense right now so don't rule it out   
   completely.   
      
   HTH,   
   M4   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)