Server 2008 Loopback Adapter Forwarding

I don't know why this information is so hard to find, but I'm copying it here to hopefully help a few more people find it.

(from http://www-01.ibm.com/support/docview.wss?rs=250&context=SSBQMN&dc=DB520&dc=DB560&uid=swg21304795&loc=en_US&cs=UTF-8〈=en&rss=ct250websphere)

In server 2008, loopback adapters are slightly different than in earlier windows operating systems. In order to forward traffic coming from your physical connection through the ips associated with the loopback you have to enable forwarding on your default connection.

netsh interface ipv4 set interface "local area connection" forwarding=enabled