IPSec MTU

From: Kyaw Khine (kkhine@xxxxxxxxxxxx)
Date: Mon Mar 11 2002 - 02:19:13 GMT-3

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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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