3 nics on and 2 different ISP's.

I have 3 nics and 2 different ISP's. I need to be able to send a heartbeat to my primary isp, and when that fails it will bring down nic1 and bring up nic2 for the secondary isp to work. Also, when the primary comes back up, it takes down nic2 and brings up nic1. I am looking for a bash script that does this for me.

Nic0 is on the internal network
Nic1 is on the primary isp
nic2 is on the secondary isp

If you bring nic1 down you will never known when the primary comes back up.

What you should be looking for is to ping the ISP via nic1 and if that fails then set your default gateway to the gateway on nic2, leaving a static route to your first ISP via nic1.

Then you can continue to ping your primary isp and change the routing back as necessary.

I am looking for a bash script that does this for me.

Please post your thread in only one forum. Posting a single thread in the most relevant forum will make it easier for members to help you and will keep the discussion in one place. This thread is being closed in favor of http://www.linuxquestions.org/questi...sp-4175441433/.