Due to Technet articel Q177610 the DHCP-server is shutting down on the
SBS-server by design if there are another DHCP-server on the network.
If you are connected to the Internet via a Cabltvmodem or similar you
can end up with several DHCP-server behind the gateway which are
designed to serve the corporate LAN:s.
But despite that the DHCP-service-bindings is disabled for the
external NIC the DHCP-server is shutting down because it founds
another DHCP-server on the network.
What do you think about enabling the security for the TCP/IP-protocol
on the external NIC? Will it prevent the DHCP Discover packets from
searching for DHCP-servers on the external NIC?
I need the SBS-server to act as a Proxy-server for outbound webaccess,
ftp etc and the Exchange server to recieve/send mail.
The external NIC:s ip is the mx-record for the email-domain on the
What ports needs then to be enabled for this to work?