Re: 4rd-U informal meeting - Tuesday 15:15 Room 204

On 03/28/12 09:22, Tetsuya Murakami wrote:

In terms of CNP, CNP needs to be calculated every time if the packet
is toward to outside of domain because the embedded IPv4 address
could be different. So, I think there is no difference between CNP
and recalculation of L4 checksum from the implementation point of
view.

On the contrary, there is a big difference. The difference is that you are only concerned with L3. L4 can change: UDP, TCP, ICMP, STCP, DCCP, etc, etc, etc. You need a lot of code to handle all existing transport protocols, and you still can't handle future protocols that people might develop.

Checksum neutrality is a *big* advantage.

Simon
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