A database server on the network is configured to require IP Security for all connections. I want to ensure that the rest of the machines in the domain can communicate with the server securely. What needs to be done to configure IPSec for the domain? Assuming that I can get by with a default policy, which one should I choose? All help is greatly appreciated, thanks.
First, IPSec is not something you configure "on the domain", it is something you configure on individual end-hosts or routers (on routers, it's normally done to provide IPSec tunnels from site to site, so that inter-site traffic is sent encrypted across a network). EDIT: Apparently you can initiate the relevant bits of host configuration within a Windows domain by setting something on the domain controller(s).
Second, what steps to take depends on what operating systems are involved.