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Packet Size in a GRE/IPSEC tunnel

Hi

I need some help in calculating the following packet size:

I am running a protocol analyzer on an Ethernet segment and I can see packets of 64 Bytes size heading to remote network through my router.

I know that my router is running a GRE/IPSEC tunnel to the remote network, and the Transform Set used is:

esp-aes 256 esp-sha.hmac comp-lzs

mode transport

Also on its serial I am using PPP encapsulation with the neighbor router.

The question is:

What would be the packet size on the serial link?

Thanks in advance

Ammar

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