This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs.
Hosts discover the addresses of their neighboring routers simply by listening for advertisements.
This is one way of testing for dead gateways. This solution requires that routers be configured to send IRDP router advertisement packets. Router discovery provides an improved method of configuring and detecting default gateways. When using DHCP or manual default gateway configuration, there is no way to adjust to network changes. Using router discovery, clients dynamically discover routers and can switch to backup routers if a network failure or administrative change is needed.