HI,
I want to build a firewall with failover (in linux) . My system has 3 nic cards, 2 nics are connected to 2 different ISP's and the 3rd nic is connected to my LAN. If any one of the ISP's fail, the firewall should automatically switch to other ISP, so that the user will have continuous connection.
Googling did not help me much in this regard. I came across shorewall, but not sure if failover can be implemented using that.
Please guide me how to I start about it, is there any free linux softwares which can help me..
Thanks,
JOY CJ
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Here's the link to the linksys router - this is a 4-port, they also have an 8-port model and gigiabit models.
http://www.linksys.com/ser
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by: arrkerr1024Posted on 2007-08-31 at 18:57:58ID: 19812302
Shorewall is a great linux firewall solution, but it does not provide automatic failover for multiple internet connections. Here is a good article on what shorewall CAN do with multiple internet connections.
http://www.shorewall.net/M
That said, it would be quite easy to write a small shell script that pings the router on the other side of your internet connection. If it doesn't get a response back the script could simply change the default route using the linux route command. It could then keep trying every n minutes and switch back if the route comes back up.