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New Reqs (Not included yet) NAT must generate & process PMTU msgs for TCP packets TCP packets often have DF(Donot Fragment) bit set & will require devices enroute to not fragment TCP segments. If MTUs donot match, NAT MUST send a destination unreachable ICMP message with suggested MTU to the sender & drop the TCP packet. NAT must also honor the ICMP destination unreachable messages it receives from intermediate nodes in either realm and forward to appr. end-node |