High availability using heartbeat s/w across a WAN

Hey guys, im currently doing some research on implementing a high availability system across a WAN link and would like help on certain areas. This is a scaled down project so I might end up using router simulators like gns3, vyatta etc instead real hardware. Also it'll involve two webservers on each side on the WAN(actually both server's will be next to each other so it's more like a fake WAN connection).

First, from peoples exprience, what are good choices of WAN connections (frame relay, leased lines etc) for such a system since failover is mostly dependent on the heartbeat monitor?

Second, is it even possible to transmit heartbeats across the WAN. I'm sure latency will be a concern but like I said this is scaled down and is for testing..

From read linux-ha.org's tutorials, I found that most setups are on same LAN and a serial(RS232) connection is used between the servers/machines.

In precis, I want to be able to achieve failover across a "fake WAN" (if you like).

Any responses or even pointers will be appreciated

Free Dummies Books
Continuous Engineering

Learn:

  • What continuous engineering is
  • How to continuously improve complex product designs
  • How to anticipate and respond to markets and clients
  • How to get the most out of your engineering resources

Get your free book now

Sponsored by IBM

Free Dummies Books
Service Virtualization

Learn to:

  • Define service virtualization
  • Select the most beneficial services to virtualize
  • Improve your traditional approach to testing
  • Deliver higher-quality software faster

Get your free book now

Sponsored by IBM