Netgear FR328S User Manual download pdf (Page 84)

FR328S ProSafe Firewall with Dial Back-Up Reference Manual v2

7-8 Advanced Configuration

M-10207-01, Reference Manual v2

Using Static Routes

Static Routes provide additional routing information to your firewall. Under normal

circumstances, the firewall has adequate routing information after it has been configured for

Internet access, and you do not need to configure additional static routes. You must configure

static routes only for unusual cases such as multiple routers or multiple IP subnets located on your

network.

Static Route Example

As an example of when a static route is needed, consider the following case:

• Your primary Internet access is through a cable modem to an ISP.

• You have an ISDN router on your home network for connecting to the company where

you are employed. This router’s address on your LAN is 192.168.0.100.

• Your company’s network is 134.177.0.0.

When you first configured your firewall, two implicit static routes were created. A default route

was created with your ISP as the gateway, and a second static route was created to your local

network for all 192.168.0.x addresses. With this configuration, if you attempt to access a device on

the 134.177.0.0 network, your firewall will forward your request to the ISP. The ISP forwards your

request to the company where you are employed, and the request will likely be denied by the

company’s firewall.

In this case you must define a static route, telling your firewall that 134.177.0.0 should be accessed

through the ISDN router at 192.168.0.100. The static route would look like Figure 7-2.

In this example:

• The Destination IP Address and IP Subnet Mask fields specify that this static route applies to

all 134.177.x.x addresses.

• The Gateway IP Address fields specifies that all traffic for these addresses should be

forwarded to the ISDN router at 192.168.0.100.

• A Metric value of 1 will work since the ISDN router is on the LAN.

This represents the number of routers between your network and the destination. This is a

direct connection so it is set to 1.

• Private is selected only as a precautionary security measure in case RIP is activated.

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Netgear FR328S User Manual Page 84