D-Link NetDefend DFL-1660, User Manual

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• Destination Interface: lan
• Source Network: 0.0.0.0/0 (all-nets)
• Destination Network: lannet
• Comment: Allow incoming calls
3. Click OK
Example 6.5. H.323 with Private IPv4 Addresses
In this scenario a H.323 phone is connected to the NetDefend Firewall on a network with private IPv4 addresses.
To make it possible to place a call from this phone to another H.323 phone on the Internet, and to allow H.323
phones on the Internet to call this phone, we need to configure rules. The following rules need to be added to the
rule set, make sure there are no rules disallowing or allowing the same kind of ports/traffic before these rules.
As we are using private IPs on the phone, incoming traffic needs to be SATed as in the example below. The
object ip-phone should be the internal IP of the H.323 phone.
Web Interface
Outgoing Rule:
1. Go to: Rules > IP Rules > Add > IPRule
2. Now enter:
• Name: H323Out
• Action: NAT
• Service: H323
• Source Interface: lan
• Destination Interface: any
• Source Network: lannet
• Destination Network: 0.0.0.0/0 (all-nets)
• Comment: Allow outgoing calls
3. Click OK
Incoming Rules:
1. Go to: Rules > IP Rules > Add > IPRule
2. Now enter:
• Name: H323In
• Action: SAT
• 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. For SAT enter Translate Destination IP Address: To New IP Address: ip-phone (IP address of phone)
6.2.9. The H.323 ALG Chapter 6. Security Mechanisms
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