Command Reference Guide

SROS Command Line Interface Reference Guide PPP Interface Configuration Command Set

ip unnumbered <interface>

Use the ip unnumbered command to use the IP address assigned to the specified interface for all IP

processing on the active interface. Use the no form of this command to remove the unnumbered

configuration.

Syntax Description

<interface> Specifies the interface (in the format type slot/port) that contains the IP address

to use as the source address for all packets transmitted on this interface.

Valid interfaces include: Ethernet (eth 0/1), virtual Frame Relay sub-interfaces

(fr 1.16), virtual PPP (ppp 1), VLAN, and loopback interfaces.

Default Values

By default, all interfaces are configured to use a specified IP address (using the ip address command).

Command Modes

(config-interface)# Interface Configuration Mode required

Valid interfaces include: Ethernet (eth 0/1), virtual Frame Relay sub-interfaces

(fr 1.16), virtual PPP interfaces (ppp 1), and VLAN interfaces.

Functional Notes

If ip unnumbered is enabled on an interface, all IP traffic from the interface will use a source IP address

taken from the specified interface. For example, specifying ip unnumbered eth 0/1 while in the PPP

Interface Configuration Mode configures the PPP interface to use the IP address assigned to the Ethernet

interface for all IP processing. In addition, the Secure Router OS uses the specified interface information

when sending route updates over the unnumbered interface. Static routes may either use the interface

name (ppp 1) or the far-end address (if it will be discovered).

Usage Examples

The following example configures the PPP interface (labeled ppp 1) to use the IP address assigned to the

Ethernet interface (eth 0/1):

(config)#interface ppp 1

(config-ppp 1)#ip unnumbered eth 0/1