DSL Router Configuration Examples
4-4
6371-A2-GB20-00
March 2000
NAPT Configuration Example
00-16611-01
Customer Premises (CP)
DSL
Router
Hub
10.1.3.2
10.1.3.3
10.1.3.4
End-user
Systems
Console
Port
Connection
Ethernet
e0
10.1.3.1
DSL
Core
Router
d0
155.1.3.2
WAN
155.1.3.1
10.1.3.
n
NAPT Mapping Public IP Addresses
Private IP Addresses
155.1.3.2 Port 23
10.1.3.4
155.1.3.2 Port n
10.1.3.2
155.1.3.2 Port n
10.1.3.3
155.1.3.2 Port n
10.1.3.n
In this NAPT example:
H
The DSL router is configured for NAPT using a single public IP address.
H
When using NAPT, the DSL (d0) interface must be numbered because the
Ethernet interface will be configured within the private address space.
H
NAPT static mapping is configured for a server (Telnet port 23) on the
Ethernet interface but publicly available.
The command line syntax is:
ifn address e0 10.1.3.1 255.255.255.0
ifn address d0 155.1.3.2 255.255.255.0
ip route create upstream e0 155.1.3.1
nat napt address 155.1.3.2
nat napt map tcp 10.1.3.4 23
nat napt enable
