The Source IP Address Used for Translation
There are three options for how NetDefendOS determines the source IP address that will be used for
NAT:
• Use the IP Address of the Interface
When a new connection is established, the routing table is consulted to resolve the outbound
interface for the connection. The IP address of that resolved interface is then used as the new
source IP address when NetDefendOS performs the address translation. This is the default way
that the IP address is determined.
• Specify a Specific IP Address
A specific IP address can be specified as the new source IP address. The specified IP address
needs to have a matching ARP Publish entry configured for the outbound interface. Otherwise,
the return traffic will not be received by the D-Link Firewall. This technique might be used
when the source IP is to differ based on the source of the traffic. For example, an ISP that is
using NAT, might use different IP addresses for different customers