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iii
Configuring Network Address Translation . . . . . . . . . 66
Overview of NAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Viewing NAT Global Settings and Statistics . . . . . . . . . . . . . . . . . . . .69
Viewing NAT Rules and Rule Statistics . . . . . . . . . . . . . . . . . . . . . . . 72
Viewing Current NAT Translations . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Adding NAT Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
The NAPT rule: Translating between private
and public IP addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
The RDR rule: Allowing external access
to a LAN computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
The Basic rule: Performing 1:1 translations . . . . . . . . . . . . . . . . . 83
The Filter rule: Configuring a BASIC rule
with additional criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
The Bimap rule: Performing two-way translations . . . . . . . . . . . . 87
The Pass rule: Allowing specific addresses to
pass through untranslated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Configuring DNS Server Addresses . . . . . . . . . . . . . . 91
About DNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Assigning DNS Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Configuring DNS Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Configuring IP Routes . . . . . . . . . . . . . . . . . . . . . . . . . 95
Overview of IP Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
IP routing versus telephone switching . . . . . . . . . . . . . . . . . . . . . 95
Hops and gateways . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Using IP routes to define default gateways . . . . . . . . . . . . . . . . . 98
Do I need to define IP routes? . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Viewing the IP Routing Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Adding IP Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Configuring the Routing Information Protocol . . . . 104
RIP Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
When should you configure RIP? . . . . . . . . . . . . . . . . . . . . . . . 105
Configuring the ADSL Barricade's Interfaces with RIP . . . . . . . . . . 105
Viewing RIP Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109