I have been searching through these archives for about a week and someone has come close to answering my question in one of the posts but since it was not the same question it was only touched on.
Currently I have this setup T-1 WAN (220.127.116.11/27 Subnet) to 3725 Edge router S0/0.1 IP 18.104.22.168. I am performing NAT on the inside stub net to the pix. The stub has a net id 192.168.254.240/28. The ins int on the 3725 has ip 192.168.254.254 and the outside int of the pix ethernet0 192.168.254.253. I use static nat for http, https, smtp, and some others. 2 ports nat to a dmz web and smtp relay server, the rest nat inside to the pix inside interface subnet. All this double nat causes me much confusing. i have got it down pretty well except that rdns do not work becuase I must have the smtp and web server going out the global nat ip instead of it's own static. My ISP originally asked that I assign 22.214.171.124 to the Fa0/0 interface of my router and on the serial T-1 connection use the following config. Can I do this and take off nat on the stub and just nat on my pix for my dmz and inside interface and provide myself with some better performance?
interface Serial 0/0
description To UUNET (u133034)
encapsulation frame-relay IETF
frame-relay lmi-type ansi
no ip address
interface Serial 0/0.1 point-to-point
ip unnumbered FastEthernet0/0
frame-relay interface-dlci 500 IETF
ip route 0.0.0.0 0.0.0.0 Serial 0/0.1