Multi Nets NAT Config Guide 1472696123183d

Multi-Nets Nat Config Guide Multi-nets_NAT_Config_Guide Multi-nets_NAT_Config_Guide doc down_res static.tp-link.com 3:

Multi-Nets Nat Config Guide Multi-nets_NAT_Config_Guide Multi-nets_NAT_Config_Guide doc down res static.tp-link.com 3:

2016-09-01

: Tp-Link Multi-Nets Nat Config Guide 1472696123183D Multi-nets_NAT_Config_Guide__1472696123183d

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How to setup the Multi-nets NAT feature on TP-LINK router
Sometimes we may need to divide an internal network into several subnets that
can share the same gateway router for Internet connection. However, by default
settings, TP-LINK router abandons packets from IP addresses in different subnets
from its LAN. So in order to achieve this, the gateway router is required to be
able to translate (NAT) and deliver packets from LAN, which have IP addresses in
different subnets. Multi-nets NAT is the feature on TP-LINK router that makes this
possible.
1. Scenario

A company has three departments in a building, Marketing, Finance and Personnel.
The requirements are as followings:
1) Each department is assigned to an individual subnet.
2) All the departments should be able to communicate with each other through
the router.
3) All the departments access Internet via the same gateway router.
2. Network planning and topology
1) Network address of each department:
Department

Network address

Marketing

172.16.10.0/24

Finance

172.16.20.0/24

Personnel

172.16.30.0/24

2) Topology:
In this scenario, TL-ER6120 acts as the gateway router and TP-LINK L3 switch, T3700G28TQ does the job of a traditional router.

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3. Configurations on the gateway router
Step 1
Add a Multi-nets NAT entry for Marketing, Finance and Personnel respectively:

Step 2
Add a Static Route entry respectively for Marketing, Finance and Personnel:
Static route is necessary in order for the gateway router TL-ER6120 to know where
to deliver the packets to IP addresses in different subnets (172.16.10.0/24,
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172.16.20.0/24 and 172.16.30.0/24).

With the topology and all the settings above, the three departments in different
subnets can communicate with each other through the traditional router and access
the Internet via the gateway router TL-ER6120 as well.

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