Westermo RedFox Series - Manual (Page 699)

Westermo OS Management Guide
Version 4.17.0-0
31.1.4.2 1-to-1 style NAT
1-to-1 NAT, also called Full NAT, maps an entire network block in a one-to-one
fashion.
31.1.4.2.1 Forward 1-to-1 NAT
Public Network (Internet)
Host
Host
.79 .33
1−TO−1
NAT
Gateway
.1
Ex: 10.20.30.0/24
Inbound Interface
Web
Server
.2
IP Destination
192.168.0.2
IP Destination
10.20.30.2
Internal/Private Network
192.168.0.0/24
External (public) IP network
Figure 31.6: 1-to-1 NAT mapping external IP addresses to internal addresses.
A 1-to-1 NAT rule is defined by an inbound interface and two network blocks, the
externally (publicly) visible network block and the internal block (typically private
IP addresses). IP packets entering the router through the inbound interface tar-
geted to the external network will be transformed so they become targeted to the
internal block instead (see
fig. 31.6 ). Packets going to the first IP in the external
block will be mapped so they go to the first IP in the internal block, packets to the
second external IP to the second internal IP, and so on. This one-to-one mapping
requires that the external and internal network blocks are of the exact same size.
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