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4. DSL Router Configuration Examples
4-6 November 2003 6300-A2-GB20-10
NAPT Configuration Example
In this NAPT example:
The DSL router is configured for NAPT using a single public IP address.
When using NAPT, the DSL interface (dsl1) must be numbered because the
Ethernet interface will be configured within the private address space.
NAPT static mapping is configured for a server (Telnet port 23) on the
Ethernet interface, but the address is publicly available.
The commands and syntax for this example are:
ip routing enable
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
nap napt map tcp 10.1.3.2 80
nat napt enable
NAPT Mapping Public IP Addresses Private IP Addresses
inbound 155.1.3.2, destination Port 23 10.1.3.4 (Telnet server)
inbound 155.1.3.2, destination Port 80 10.1.3.2 (Web server)
01-16611-03
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
10.1.3.8
Telnet
Server
Web Server