Going over the Internet, you may hit
dozens of routers or switches. No router or switch has a complete path defined between
every network node; it generally has information about where to forward the request
(something like a default gateway).
When you add a new server on an internal network, it may be necessary to update
your internal routers. Furthermore, switches that send requests to that server should
remain on the internal network, or those requests should be forwarded to a special
zone that exists between the internal network and the outside world. If you don??™t do
these things, then requests to the new server may be sent off into oblivion. With the latest
switch and router hardware, the sort of reconfiguration I??™ve just described is less of
a problem than it was formerly, but a lot of older network devices are still in use. Don??™t
forget about establishing a physical network location if you happen to have some of
these older devices.
Why is all this important to disaster recovery? What happens when you replace a
downed server? Will it have the same IP address? Perhaps not.
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