"This tutorial shows how to set up a Ubuntu Feisty Fawn (Ubuntu 7.4) based server that offers all services needed by ISPs an"
Not sure how good the idea of installing feisty as a server is. Its supported till 2008, whereas Dapper LTS (Long Time Support) is supported up till 2011. I'm already regretting running my server on edgy. The only reason I see for using Feisty on a server might be better hardware support.