What are the operations that must be performed by a proxy on the Message-Authenticator?

 The proxy is added its proxy state (33) and after sends back the request to the server destinations.

The HMAC-MD5 is using the packet length so when you change the packet you need to recompute the Message-Authenticator. As the Message-Authenticator contains a checksum calculated with the length of the packet.

Thanks

 

 

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