At the moment the forum server doesn't use Host Header information to access the web site. You can access it direct by putting the IP address in the browser command line:
http://209.9.226.104/forum and this will work.
However, if the same IP address is ever used to host another web site on the same server then this method will no longer work. In this case, as a work around you can edit the hosts file on your PC and put an entry as follows:
216.18.197.195 projectavalon.net
Note: Don't put www at the beginning
When you have done this you can will be able to access the forum in the usual manor as the address will be resolved for you from your hosts file instead of DNS. i.e.
http://projectavalon.net/forum
On Windows PC's the hosts file is in C:\Windows\System32\drivers\etc
On Linux/UNIX PC's it is in /etc
The lookup service in the previous post relies on valid DNS entries for a Domain Name. If dark forces were to invalidate/remove the DNS entry or Domain Name for projectavalon.net then this lookup would no longer work either - you would need to have this information already at hand.
There is actually nothing to stop you from editing your hosts file and putting these entries in. Then if anything did happen to DNS or the Domain name you would still be able to access the forum.