[IPsec] IV in ESP packets for AES-CBC and AES-CTR methods

[ss murthy nittala]

Hi,
Is it required for IV to be randomly generated for each ESP packet in 
case of AES-CTR and AES-CBC methods?

AES-CTR:My understanding is that IV is to be generated randomly for 
the first packet.For each new outgoing packet increment IV and use it.

AES-CBC:Is it required for IV to be randomly generated for each of 
the outgoing ESP packets?In any case i think the packet shall include IV.

Thanks
-ns murthy 


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