H.323 With Gatekeeper - D-Link DFL-260E User Manual

6.2.9. The H.323 ALG
• Source Interface: any
• Destination Interface: core
• Source Network: 0.0.0.0/0 (all-nets)
• Destination Network: wan_ip (external IP of the firewall)
• Comment: Allow incoming calls to H.323 phone at ip-phone
3. For SAT enter Translate Destination IP Address: To New IP Address: ip-phone (IP address of phone)
4. Click OK
1. Go to Rules > IP Rules > Add > IPRule
2. Now enter:
• Name: H323In
• Action: Allow
• Service: H323
• Source Interface: any
• Destination Interface: core
• Source Network: 0.0.0.0/0 (all-nets)
• Destination Network: wan_ip (external IP of the firewall)
• Comment: Allow incoming calls to H.323 phone at ip-phone
3. Click OK
To place a call to the phone behind the NetDefend Firewall, place a call to the external IP address on
the firewall. If multiple H.323 phones are placed behind the firewall, one SAT rule has to be
configured for each phone. This means that multiple external addresses have to be used. However, it
is preferable to use an H.323 gatekeeper as this only requires one external address.
Example 6.8. H.323 with Gatekeeper
In this scenario, a H.323 gatekeeper is placed in the DMZ of the NetDefend Firewall. A rule is configured in the
firewall to allow traffic between the private network where the H.323 phones are connected on the internal
network and to the Gatekeeper on the DMZ. The Gatekeeper on the DMZ is configured with a private address.
The following rules need to be added to the rule listings in both firewalls, make sure there are no rules disallowing
or allowing the same kind of ports/traffic before these rules.
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Chapter 6. Security Mechanisms