From UntangleWiki

Contents 1 About External Aliases 2 Routing Traffic To Untangle Server From Another External Network (Standard Mode) 3 Routing Traffic To Untangle Server From Another External Network (Advanced Mode)

About External Aliases

Untangle provides the ability for a company to route many different public IP addresses through a single Untangle Server, so that within the LAN, all these IP addresses can be handled according to your business needs.

If you have more than one public IP address (64.233.167.99, google.com), you can assign the secondary addresses as external aliases (64.233.167.83, gmail.com). The Untangle Server can provide protection, handling for both the primary address assigned to the Untangle Server as well as any aliases that you specify.

Routing Traffic To Untangle Server From Another External Network (Standard Mode)

This topic is for Standard Mode only. If you are in Advanced Mode, go to Routing Traffic To Untangle Server From Another External Network (Advanced Mode). In order to create NAT policies, you must be in Advanced Mode.

• If your Untangle Server is a bridge, you can create an external address alias to allow the Untangle Server to route traffic for a network other than the network that is defined by the Untangle Server's external IP address.

• If the Untangle Server is a router, you can create an external address alias to allow the Untangle Server to receive traffic for more than just the network of the Untangle Server's external interface.

1. From the Navigation pane, choose Config > Networking.
2. Click the Network tab.
3. In the Configuration for the External Interface section, click on the External Aliases button. The External Aliases window launches.
4. Click the plus (+) button. A new row appears in the table.
5. In the new row, specify the address and netmask of the additional external network. The netmask may be entered in dot notation such as 255.255.255.0 or CIDR but will be displayed in CIDR notation after it is set.
6. Click Save.

Routing Traffic To Untangle Server From Another External Network (Advanced Mode)

This topic is for Advanced Mode only. If you are in Standard Mode, go to Routing Traffic To Untangle Server From Another External Network (Standard Mode).

For more complex deployments:

• If your the Untangle Server is a bridge, you can create an external address alias to allow the Untangle Server to route traffic for a network other than the network that is defined by the Untangle Server's external IP address.

• If the Untangle Server is a router, you can create an external address alias to allow the Untangle Server to receive traffic for more than just the network of the Untangle Server's external interface.

• If you want to create a NAT policy as outlined in Configuring Untangle Server's Interfaces (Advanced Mode), each source address must be assigned to the Untangle Server.

1. From the Navigation pane, choose Config > Networking.
2. Click the Interfaces tab.
3. Click the Edit link for the external interface. A new window launches.
4. Click the plus (+) button. A new row appears in the table.
5. In the new row, specify the address and netmask of the additional external network. Express the netmask as a CIDR prefix.
6. Click Save.

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