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Req # 3 – TCP Keep-alive Upon Session Timer expiry, NAT SHOULD enter a "probe" state and send TCP keep-alive packets to internal endpoint. Upon receiving ACK or data traffic, NAT should reset Session Timer and remain in ACTIVE state. Upon receiving RST, NAT should forward the RST to External Server, enter CLOSING state and start Close Timer. Upon not receiving any response after a few retries, NAT should send RST to both parties, enter CLOSING state and start Close Timer. |