vApplying the DDNS policy to an interface················································································································ 107Specifying the DSCP value for outgoing DDNS packets ························································································· 107Displaying DDNS ························································································································································· 108DDNS configuration examples ··································································································································· 108DDNS configuration example with www.3322.org ······················································································· 108DDNS configuration example with PeanutHull server ····················································································· 109Configuring NAT ····················································································································································· 111Terminology ·································································································································································· 111NAT device ·························································································································································· 111NAT interface ······················································································································································ 111NAT address ························································································································································ 112NAT entry ····························································································································································· 112NAT types ····································································································································································· 112Traditional NAT ··················································································································································· 112Bidirectional NAT ················································································································································ 112Twice NAT ··························································································································································· 112Easy IP ·································································································································································· 112NAT translation control ··············································································································································· 112NAT features ································································································································································· 113Static NAT ···························································································································································· 113Dynamic NAT ······················································································································································ 113NAT Server ·························································································································································· 114NAT hairpin ························································································································································· 115NAT entries ··································································································································································· 116NAT session entry················································································································································ 116EIM entry ······························································································································································ 116NO-PAT entry ······················································································································································· 116Using NAT with other features···································································································································· 116NAT with MPLS VPNs ········································································································································· 116NAT with DNS mapping ···································································································································· 117NAT with ALG ····················································································································································· 117NAT configuration task list ·········································································································································· 118Configuring static NAT ················································································································································ 118Configuration prerequisites ································································································································ 118Configuring outbound one-to-one static NAT ··································································································· 118Configuring outbound net-to-net static NAT ····································································································· 119Configuring inbound one-to-one static NAT ····································································································· 120Configuring inbound net-to-net static NAT········································································································ 120Configuring dynamic NAT ·········································································································································· 121Configuration restrictions and guidelines ········································································································· 121Configuration prerequisites ································································································································ 121Configuring outbound dynamic NAT ················································································································ 121Configuring inbound dynamic NAT ·················································································································· 122Configuring NAT Server ·············································································································································· 123Configuring common NAT Server ····················································································································· 123Configuring load sharing NAT Server ·············································································································· 124Configuring NAT with DNS mapping ······················································································································· 125Configuring NAT hairpin ············································································································································ 125Configuring NAT with ALG ········································································································································· 125Configuring NAT logging ··········································································································································· 126Displaying and maintaining NAT······························································································································· 126NAT configuration examples ······································································································································ 127One-to-one static NAT for internal-to-external access ······················································································ 127Outbound dynamic NAT for internal-to-external access (non-overlapping addresses) ································ 129