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Configuring Application Layer Gateway 84
HomePortal 3801HGV Gateway User Guide Configuring Firewall Settings
If you enable SIP ALG, client applications can use dynamic TCP/ UDP ports to communicate with
the known ports used by the server applications, even though a firewall configuration allows only a
limited number of known ports.
If you disable ALG, the ports get blocked and you have to explicitly open up a large number of ports
in the firewall rendering the network vulnerable to attacks on those ports.
Steps
1. Navigate to Settings > Firewall > Advanced Configuration. The Advanced configuration
page to configure the SIP ALG settings appears.
2. Enable or disable the SIP ALG on the gateway firewall by selecting or clearing the check
box.
3. Click Save. This saves the configuration changes.
See Also
Configuring LAN Devices on page 50
Configuring Broadband Settings on page 34
Using Diagnostics Features on page 93
Troubleshooting 3801HGV Gateway on page 109