WALL IE, Industrial Ethernet Bridge and Firewall | Version 1 | 15.05.2017
22
6.1
Basic NAT
Basic NAT, also known as "1:1 NAT" or "Static NAT", is the translation of individual IP addresses or of
complete address ranges.
The "External IP" must be a free or unused IP address in the WAN network. The "Internal IP" is the IP
address of the device in the LAN that is assigned to the "External IP" in the WAN. Translation takes
place at the IP level and all ports can be addressed. Access can be limited to certain ports by entering
packet filter rules.
When defining a "Basic NAT" rule, all ports for "WAN to LAN" data transfer are initially blocked for data
transfer!
In order to enable access, packet filter rules must be created or the default action for the packet filters be
set to "Accept".
The "LAN to WAN" data transfer is initially always allowed, but can also be limited by packet filters or the
default action.
