tom edelbrok

I have an Exchange 5.5 Server running on a Private Class 'B' (172.16.x.x),
and a 'Symantec Antivirus for SMTP Gateways' test-product running on a
publicly-addressable IP on the internt. The SMTP Gateway box is NT 4.0
Server, and is multi-homed, so it knows the internet addresses as well as
the internal addresses.

The problem I have is that when I send e-mail outbound to the internet from
my 'test LAN' it won't go because the source address is 172.16.x.x, and
private IP addresses get dropped on the web. So how can I get Exchange (or
TCP/IP) to masq the source address so that it becomes the IP of the external
interface of the SMTP gateway box instead of the real Exchange Server
machine? (doing this would prevent my packets from getting dropped on the
internet).

Thanks in advance,

Tom Edelbrok

scott harding - ms mvp

NT does not support NAT. You will need a NAT device to do this, like Windows
2k and up or some sort of third party proxy/firewall software for NT. They
do exist. Simply having an internal nic with the private scheme and an
external nic with a real IP will not work in NT.

--
Scott Harding
MCSE, MCSA, A+, Network+
Microsoft MVP - Windows NT Server