Hi,

BTW, suppose following netowrk.

         Internet
            |
          ROUTER
            |
            | 100BASE-TX / MTU=1500
            |
        GbE-SWITCH
         |      |
         |      | 1000BASE-T / MTU=9018
         |      |
       HOST1   HOST2

HOST1, HOST2 and GbE-SWITCH support 1000BASE-T and Jumbo Frames, but
ROUTER has only 100BASE-TX interfaces and doesn't support Jumbo
Frames.

In my personal view, having devices on shared media with different MTU's is just a bad idea. Trying to get it to work is complicated and I think it will have lots of nasty failure cases. If one wants to have mixed speeds (like the example above) then use the default MTU (i.e., 1500) or replace the GbE-Switch with a Router. If one wants Jumbo Frames, then make sure all of the nodes on the link support 1000Base-T.

Bob




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