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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

.

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When you

Save / Apply

the IP filter, the

Outgoing IP Filtering Setup

screen appears. The

Outgoing IP Filtering Setup

screen lists the outgoing IP filters, including filters which were

added from the previous screen.

You can view, add or delete outgoing filters. The

Remove

button appears only when you have an

existing IP filter already set up.

IP Filtering

—

Incoming

Incoming IP filter filters the WAN traffic to the LAN side. Click

Add

to add incoming filter settings.

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Enter a filter name, information about the source address (from the WAN side), and information

about the destination address (to the LAN side). Select the protocol and WAN interface, then click

Save/Apply

to add the setting.

You can view and delete the incoming filter settings in the

Add Ip Filter -- Incoming

screen.

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When you

Save / Apply

the IP filter, the

Incoming IP Filtering Setup

screen appears. The

Incoming IP Filtering Setup

screen lists the incoming IP filters, including filters which were

added from the previous screen.

You can view, add or delete incoming filters. The

Remove

button appears only when you have an

existing IP filter already set up.

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MAC Filtering

MAC filtering can forward or block traffic by MAC address. You can change the policy or add

settings to the MAC filtering table in the

MAC Filtering Setup

screen.

To add a setting to the MAC filtering table, then click

Add

to access the

Add MAC Filter

screen,

then configure the MAC filter.



Protocol type

: Type of protocol to filter.



PPPoE



IPv4



IPv6



AppleTalk



IPX



NetBEUI



IGMP



Destination MAC Address

: the destination MAC address you want to filter



Source MAC Address

: define the source MAC address



Frame Direction

: You can define the direction of the filter.

Options are



LAN TO WAN and WAN TO LAN



WAN to LAN



LAN to WAN