DSL Router Configuration Examples
4-4
6371-A2-GB20-10
August 2000
NAPT Configuration Example
00-16611-02
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
eth1
10.1.3.1
DSL
Core
Router
dsl1
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 23 10.1.3.2
155.1.3.2 Port 23 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 interface (dsl1) 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 for this example is:
ifn
address eth1 10.1.3.1 255.255.255.0
ifn
address dsl1 155.1.3.2 255.255.255.0
ip route create upstream eth1 155.1.3.1
nat napt address 155.1.3.2
nat napt map tcp 10.1.3.4 23
nat napt enable
