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Req # 6 - Seq/Ack # adjustment Recommendation for NAT only when ALGs are enabled on the same device. Not mandatory requirement. If NAT has ALG enabled, the ALG might cause application-payload to increase/decrease in size. The ALG will need to change seq/ack number in the TCP header & save this information along with the delta of change in the TCP NAT Session, so as to adjust subsequent TCP packets of the session. If NAT has ALG enabled, the TCP NAT Sessions SHOULD be extended to include [seq-delta, ack-delta] info in the TCP NAT Session. |