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Q about IP MTU and TCP ADJUST-MSS

I'm having this issue with mtu size.

Setting the:

     ip mtu1378

     ip tcp adjust-mss 1338

on the LAN interface of the router, i believe that when pinging with greater packet size and DF set, the router should reply that it should be fragmented.

But on my 1841 IOS 12.4, it doesn't.  I only get request timed out.

But with other routers in my network, this works fine.  And the router replies that the packet needs to be fragmented.  This is with a 7206vxr and a 881 router.

Why doesn't it work with the 1841 router?

Sandstrand

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