D-Link DFL-2500 User Guide - Page 187
Translate Destination IP Address
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168 Chapter 18. Application Layer Gateway (ALG) using private IPs on the phones, incoming traffic need to be SATed as in the example below. The object ip-phone below should be the internal IP of the H.323 phone behind each firewall. WebUI : 1. Outgoing Rule Rules → IP Rules → Add → IP Rule: Enter the following: Name: H323Out Action: NAT Service: H323 Source Interface: LAN Destination Interface: any Source Network: lan-net Destination Network: 0.0.0.0/0 (all-nets) Comment: Allow outgoing calls. Then click OK 2. Incoming Rules Rules → IP Rules → Add → IP Rule: Enter the following: Name: H323In Action: SAT Service: H323 Source Interface: any Destination Interface: core Source Network: 0.0.0.0/0 (all-nets) Destination Network: ip-wan (external IP of the firewall) Comment: Allow incoming calls to H.323 phone at ip-phone. SAT Translate Destination IP Address: To New IP Address: ip-phone (IP address of phone) Then click OK D-Link Firewalls User's Guide