Is a DMZ recommended: I've read through several of the questions and some of the FAQs on the isaserver.org site, along with some MS documents. After reading these, I am wondering if a DMZ is really necessary. How much added security does it provide? I was considering a Tri-homed scenario using public IPs on the DMZ. Does it cause administration issues, etc.? Second question, has anyone attempted an IPSEC VPN to a Netopia R series router, specifically a R9100 with a VPN module?