Black Box LRU4240 - Manual (Page 73)

Dual Trunk E1 Router
Dual Trunk E1 Router User’s Guide TECHNICAL: 0118 96 56 000 61
• NET1 to ISP1 with single global IP address 120.20.30.10
• NET2 to ISP2 with 4 global IP address starting from 200.80.100.21.
Configuring NAT for Internet access and Frame Relay network
In the example below the enterprise frame relay network central site provides internet access for all
the remote enterprise networks. A single DLCI (200) will be set for Internet access. The central site
router will be configured to:
• Disable NAT on intranet traffic. IP traffic between central site networks and remote branch
networks will take place without any NAT translation. This will enhance the router
performances.
• Enable NAT on internet access. NAT translation will take place on any internet traffic from
central network or remote networks.
Table 6-8 Configuring NAT for Multihoming
Procedure Steps
Setting ISP1 link 1.Select menu-$JAGlobal Map Table
2.Select Translated IP address field.
3.Enter 120.20.30.10 as the starting global IP address
4.Set subnet mask to 32
5.Set the interface field to NET1.
6.Set Action field to Add
Enter local networks that
require NAT translation
on NET1 1.Select Menu-$JC
Add a row entry in this table for each network you want enable internet access.
2.Select local IP address field of an inactive entry (field set to Delete)
3.Enter the IP address that will be translated
4.Set subnet mask field of the translated network
5.Set interface to NET1
Setting ISP2 link 1.Select menu-$JAGlobal Map Table
2.Select Translated IP Address field.
3.Enter 200.80.100.21 as the starting global IP address
4.Set subnet mask to 30.
This will allocate addresses: 200.80.100.21 through 24
5.Set the interface field to NET2.
6.Set Action field to Add
Enter local networks that
require NAT translation
on NET2 1.Select Menu-$JC
Add a row entry in this table for each network you want enable internet access.
2.Select local IP address field of an inactive entry (field set to Delete)
3.Enter the IP address that will be translated
4.Set subnet mask field of the translated network
5.Set interface to NET2