NAT Editors
In the case where the NAT component must additionally translate and adjust the payload beyond the IP, TCP, and UDP headers, a NAT editor is required. A NAT editor is an installable component that can properly modify otherwise nontranslatable payloads so that they can be forwarded across a NAT.
Windows 2000 includes built-in NAT editors for the following protocols:
FTP
ICMP
PPTP
NetBIOS over TCP/IP
Additionally, the NAT routing protocol includes proxy software for the following protocols:
Direct Play
LDAP-based ILS registration
RPC
Note
IPSec traffic is not translatable.