From: Sam Munzani (sam@xxxxxxxxxxx)
Date: Mon Mar 11 2002 - 12:04:29 GMT-3
It will work fine but then packet will be fragmented and reassembled as it
crosses any ethernet segment. Ethernet max mtu is 1500. When you add tunnel
header on top of your max size frame, your packet will be bigger. Making it
1440 allows 60 bytes for header. That way no need for packet fragmentation.
Sam
> Hi Group,
>
> I was trying to working on IPSec + GRE as in
> http://www.cisco.com/warp/public/707/ipsec_gre.shtml
>
> Everything works fine but I don't really understand why do I have to
change
> MTU to be 1440 on the tunnel interface.
> Ping packets are going through IPSec/GRE tunnel even with the packet size
of
> 1500.
>
> Any thoughts .. comments ?
>
> Thanks ..
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