Brian Kolaci wrote:
Hi,
I'm looking to setup a box mainly as a routing decision maker. I'll have 2 DSL lines, a primary and backup (to 2 different ISP's). I'd like traffic to go out the primary (faster and static IP's) when its up and have it automatically failover to the second DSL router when the first dies. I have a LAN -> watchguard -> linux box -> 2 DSL connections.
Careful with the Watchguards. They have a nasty tendency to stop working right around the time they run out of ports to masq to. So if you've got a lot of clients behind the Watchguard, it can be a real pain in the posterior.
Actually, the linux box and the 2 DSL lines are on the same physical network. I'd setup the linux box with static routes to force pings through each of the DSL lines and when it notices one line down to force the default route through the backup.
Okay, sounds good so far...
The trick I'm finding is getting it to forward packets from the watchguard back out the same interface to one of the DSL lines. I can't seem to get it to work like a router when there's only a single ethernet interface.
Have you tried setting up subinterfaces? (eth0:0 and eth0:1) That might work better, as you can assign different IP and gateway data to the same physical controller, and would make things overall less cranky.
I'm looking to make a transparent failover (and recovery) between the DSL lines. The watchguard can only take a single IP address for its default internet connection.
There is some data out there on this, but it's been a while (I think) since anyone's done it. It IS possible, though.
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