Nortel BCM50a, Configuration Manual

Page: 106 / 315

106 Chapter 9 Network Address Translation (NAT)
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Figure 44 Menu 15.2: Specifying an inside server
Example 3: Multiple public IP addresses with inside servers
In this example, there are 3 IGAs from our ISP. There are many departments but
two have their own FTP server. All departments share the same router. The
example reserves one IGA for each department with an FTP server and all
departments use the other IGA. Map the FTP servers to the first two IGAs and the
other LAN traffic to the remaining IGA. Map the third IGA to an inside web
server and mail server. Four rules need to be configured, two bi-directional and
two uni-directional, as follows.
1 Map the first IGA to the first inside FTP server for FTP traffic in both
directions (
1 : 1 mapping, giving both local and global IP addresses).
2 Map the second IGA to the second internal FTP server for FTP traffic in both
directions (
1 : 1 mapping, giving both local and global IP addresses).
3
Map the other outgoing LAN traffic to IGA3 (
Many : 1
mapping).
4
You also map your third IGA to the web server and mail server on the LAN. If
you choose type
Server
, you can specify multiple servers, of different types,
to other computers behind NAT on the LAN.
Menu 15.2 - NAT Server Setup
Default Server: 192.168.1.10
Rule Act. Start Port End Port IP Address
------------------------------------------------------
001 No 0 0 0.0.0.0
002 No 0 0 0.0.0.0
003 No 0 0 0.0.0.0
004 No 0 0 0.0.0.0
005 No 0 0 0.0.0.0
006 No 0 0 0.0.0.0
007 No 0 0 0.0.0.0
008 No 0 0 0.0.0.0
009 No 0 0 0.0.0.0
010 No 0 0 0.0.0.0
Select Command= None Select Rule= N/A
Press ENTER to Confirm or ESC to Cancel: