Specifications

15xx-A1 Family Router Users Guide 51
ALG
ALG, Application Layer Gateway can be used to allow firewall traversal with SIP. To enable voice
packets to successfully pass through firewalls and NAT, click on the SIP enabled checkbox.
Security
For security reasons, firewall options can be configured only from the LAN side of the router.
IP Filtering—Outgoing
Outgoing IP filters block LAN traffic from entering the WAN side. The Outgoing IP Filtering
Setup screen will show all outgoing IP filters. Click Add to create filters.
The Add IP Filter -- Outgoing screen will appear. Add the filter name, source information (from
the LAN side), and destination information (from the WAN side). Then click Save / Apply.