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CE-CE MTU Problem ...

  • From: Garry Glendown <garry@regio.net>
  • Date: Thu, 07 Oct 2004 08:12:17 +0200
  • Resent-Date: Thu, 7 Oct 2004 02:43:50 -0400
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Hi,

after getting just about all the problems worked out (both MPLS 
connection related and not) and our customer up an running, a new 
problem came up ... while all "regular" connection going through the DSL 
dial up router work fine, the MPLS VPN connection of the customer has 
problems with the MTU (I suspect) - while normal telnet/terminal 
sessions work fine inside their MPLS VPN, ftp transfers don't ... 
problem is I can't get a tcpdump from the FTP site (AS400?), so I can't 
really pinpoint what is happening at the moment ... basic config is: all 
Cisco routers, MTU 1456 on the DSL link (changed down from 1480 
originally used), MTU 1500 on the ethernet on either side of the CE 
routers, minimum MTU 1500 on the backbone w/ an mpls mtu of 1520 w/ ip 
tcp adjust-mss 1416 (which is messed up to 1432 by MPLS)

Any ideas?

Tnx, -gg

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