XPost: comp.os.linux.networking   
   From: markhobley@yahoo.donottypethisbit.co   
      
   On Sun, 22 May 2011 06:01:14 +0000, Jorgen Grahn wrote:   
      
   > And then you have GTP tunneling between the routers (SGSN, GGSN) in the   
   > 3G network. These frequently pull stupid stunts, too.   
   >   
   > I don't know ... you also seem to say that IP fragmentation doesn't work   
   > for you.  That's so abnormal that perhaps you should debug that first.   
      
   I'm trying :)   
   What is also weird is that my system has been working with previous kernel   
   versions. It has only just become broken again.   
      
   I'll try dropping another 12 bytes off the ip route command and retest:   
      
   ip route change default via 10.0.0.1 mtu lock 1400   
      
   Am I right in that the below datagram is wrong, because the mss is 1460,   
   which is above the value of the mtu in the routing table? Shouldn't the   
   value of the mtu have been factored in here, and a new mss calculated based   
   on the mtu?   
      
   03:43:04.320740 IP venus.markhobley.yi.org.52201 >   
   > news.eternal-september.org.nntp: Flags [S], seq 2304145392, win 14600,   
   > options [mss 1460,sackOK,TS val 47122576 ecr 0,nop,wscale 5], length 0   
      
   --   
   Mark Hobley   
   Linux User: #370818  http://markhobley.yi.org/   
      
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