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 -- DTN made easy, lean, and smart --> http://postellation.viagenie.ca NAT64/DNS64 open-source --> http://ecdysis.viagenie.ca STUN/TURN server --> http://numb.viagenie.ca _______________________________________________ Softwires mailing list [email protected] https://www.ietf.org/mailman/listinfo/softwires
