Telindus 1031, User And Reference Manual

Page: 128 / 394

Telindus 1031 Router Chapter 7
User manual Configuring the router
118
7.4.2 When use NAT and/or PAT
You can use NAT, PAT or a combination of both:
Check in the next table whether you need NAT and/or PAT:
Address translation Description
NAT NAT allows the use of private IP addresses on the local Ethernet, while still
having access via the WAN interface to the Internet (official IP addresses).
Each Ethernet IP address that needs Internet access is translated into an
official IP address before sending traffic on the WAN interface. The number
of simultaneous users with Internet access is limited to the number of official
IP addresses. This is a dynamic process.
PAT PAT uses only one single official IP address on the WAN network. The Tel-
indus 1031 Router translates all private IP addresses on the local Ethernet
to the single official IP address. Only outgoing TCP sessions are supported.
NAT and PAT You can combine both translation methods and tune them to specific needs.
No. of official IP
addresses No. of devices on local
network Use NAT of PAT? Refer to …
1 more than 1 Use PAT. 7.4.3 - Configuring PAT
on page 119
k (> 1) more than k Use NAT in combination
with PAT. 7.4.9 - Combining PAT
and NAT
on page 126
at least k k ( ≥ 1) 1. No translation
needed.
2. If you want translation,
use NAT.
1. Skip this section.
2.
7.4.7 - Configuring
NAT
on page 124