HP VPN Firewall Appliances Network Management Configuration Guide

21
Ste
p
Command Remarks
1. Enter system view.
system-view
N/A
2. Create a loopback interface and
enter loopback interface view.
interface loopback
interface-number
N/A
3. Set the interface description.
description text
Optional.
By default, the description of a loopback
interface is interface name Interface.
4. Shut down the loopback interface.
shutdown
Optional.
By default, a loopback interface is up.
5. Restore the default settings for the
loopback interface.
default Optional.
You can configure settings such as IP addresses and IP routes on loopback interfaces.
Configuring the null interface
Introduction
A null interface is a completely software-based logical interface, and is always up. However, you cannot
use it to forward data packets or configure an IP address or link layer protocol on it. With a null interface
specified as the next hop of a static route to a specific network segment, any packets routed to the
network segment are dropped. The null interface provides a simpler way to filter packets than ACL. You
can filter uninteresting traffic by transmitting it to a null interface instead of applying an ACL.
For example, by executing the ip route-static 92.101.0.0 255.255.0.0 null 0 command (which configures
a static route leading to null interface 0), you can have all the packets destined to the network segment
92.101.0.0/16 discarded.
Only one null interface, Null 0, is supported on your device. You cannot remove or create a null
interface.
Configuration procedure
To enter null interface view:
Ste
p
Command Remarks
1. Enter system view.
system-view
N/A
2. Enter null interface view.
interface null 0
The Null 0 interface is the default null interface on your
device. It cannot be manually created or removed.
3. Set the interface description.
description text
Optional.
By default, the description of a null interface is interface
name Interface.
4. Restore the default settings
for the null interface.
default Optional.