How do we use multiple ISP IP addresses with only one port on the incoming device?
Posted on 2008-10-08
We have been getting along fine by using the first IP address in the ISP-provided block with NAT and port forwarding. Now, we are about to add a conferencing application and we'd like to use one of the other IPs provided by the ISP.
We are using a Juniper Netscreen SSG140 as the firewall, which has multiple interfaces. There is only, however, one interface on the device from which the Internet connection originates (Cisco IAD).
What is the best way to go about using one of the other IP addresses? If another routing technique is recommended using the primary IP, I am fine with that. Our goal is to have external customers connect to conference.ourdomain.com. I am not sure if that will reside on port 80, which is why I wanted to try to separate it from the primary IP address which already utilizes that port.
IP address block
First IP is Gateway, x.x.x.250 currently in use.
Thanks in advance!