User's Manual

001-2019-500 Rev 0 Paragon4 – UHF, 700 & 800MHz User Manual
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6.8.4.1 NAT on the Base Unit (Paragon4)
The purpose of the “Network Address Translation” (NAT) protocol is to hide a private IP network
from a public network. The mechanism serves both as a firewall function and to save IP address space.
When NAT is enabled on the P4, the private network (from the point of view of the Base station) is the IP
network associated to the Ethernet 2 interface.
Figure 27 - NAT Enabled on Paragon4
Figure 28 - Paragon4 - Example 1
In example 1, Management Host 1 sends Packet (1) to External Host 1. Since the source IP address of
Packet (1) comes from the private network, it gets replaced by the IP address of the Ethernet 1 interface of
the Base station.
External Host 1
200.1.1.1/24
RF Network
Public Network
(External Network + RF Network +
Mobile 1 Network + Mobile 2 Network)
Mobile 1 Network
Base
(Paragon4)
Ethernet 1
192.168.1.1/24
Mobile Host 1
173.30.1.2/24
Mobile (G3)
Mobile (G3)
Ethernet 2
172.30.1.1/24
RF 10.0.1.2/24
RF 10.0.1.3/24
173.30.1.1/24
174.30.1.1/24
Mobile Host 2
174.30.1.2/24
Mobile 2 Network
External
Network
Management Host 1
172.30.1.2/24
Management Host 2
172.30.1.3/24
Private Network
172.30.1.0/24
RF 10.0.1.1/24
1
Packet (1)
Source Address 172.30.1.2
Destination Address 200.1.1.1
2
Packet (1)
Source Address 192.168.1.1
Destination Address 200.1.1.1
172.30.1.1/24
192.168.1.1/24
Paragon4
(NAT Enabled)
Management Host 1
172.30.1.2/24
External Host 1
200.1.1.1/24
Private network (172.30.1.0/24) Public network (External)
3
Packet (2)
Source Address 200.1.1.1
Destination Address 192.168.1.1
4
Packet (2)
Source Address 200.1.1.1
Destination Address 172.30.1.2
Preliminary