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Two ISP links with ISA - 8.Oct.2008 11:05:40 AM

paulo.oliveira

Posts: 911
Joined: 3.Jan.2008
From: Amazonas, Brazil
Status: offline

Hi,

in the Brazil technet forums came out a doubt if it is possible to configure two external NICs with two different gateways for redundancy.

I know ISA doesn´t support multiple gateways, but a member from the forum said it could be done by using gateway metrics.

For example, If I have two links (main and backup) from two different ISP, I can configure the backup link with a metric 2500 and the main with the metric 1.

Main link

IP Address: 200.200.200.200/24

Default gateway: 200.200.200.201

Metric: 1

Backup link

IP Address: 192.168.254.253

Default gateway: 192.168.254.254

Metric: 2500

According to him, windows will use the default route for outbound access, and in case of dead gateway detection, the backup link will assume.

He tested and it works very well...

My question is: Could this be done?

Regards,
Paulo Oliveira.

Post #: 1

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RE: Two ISP links with ISA - 8.Oct.2008 11:12:53 AM

paulo.oliveira

Posts: 911
Joined: 3.Jan.2008
From: Amazonas, Brazil
Status: offline

Hi,

one more information about my question:
"The Automatic Metric feature is configured independently for each network interface in the network. This feature is useful in situations where you have more than one network interface of the same speed, for example, when each network interface has been assigned a default gateway. In this situation, you may want to manually configure the metric on one network interface, and enable the Automatic Metric feature to configure the metric of the other network interface. This setup can enable you to control the network interface that is used first in the routing of IP traffic."

This was copied from http://support.microsoft.com/kb/299540/en-us

Hope someone can answer me.

Regards,
Paulo Oliveira.

(in reply to paulo.oliveira)

Post #: 2