Using EE with network address translation (NAT)

Network address translation (NAT) is a technique where a one-to-one address translation function is performed, translating a single internal IP address to a single public IP address. NAT is a broad term that encompasses both a one-to-one address translation function, and network address/port translation (NAPT)

An internal-external IP address mapping is maintained by the NAT device. IP addresses are translated, but ports are unchanged. The mapping can be static or dynamic. For a static mapping, there is a definition in the NAT that always translates IP address x.x.x.x to IP address y.y.y.y. For a dynamic mapping, the NAT has a pool of IP addresses that are assigned as needed, so IP address x.x.x.x might be mapped to IP address y.y.y.y one time, and to IP address z.z.z.z at another time.

Restriction: Because EE requires a unique IP address mapping, dynamic network address translation is generally incompatible.

The following considerations apply when using EE on IP networks implementing network address translation:

For predefined EE connections, ensure that the remote IP address is the public address translated or mapped by the NAT device.
To enable EE connection networks to coexist with NAT, define the connection network using the HOSTNAME operand, not the IPADDR operand.