2Wire HomePortal 3801HGV User Manual page 92

HomePortal 3801HGV Gateway User Guide
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
Configuring Broadband Settings
Using Diagnostics Features
Troubleshooting 3801HGV Gateway
Configuring Application Layer Gateway
on page 50
on page 34
on page 93
on page 109
Configuring Firewall Settings
84