HP 7000 dl Router Series Guide de l'utilisateur télécharger pdf (Page 749)

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SROS Command Line Interface Reference Guide PPP Interface Configuration Command Set

ip helper-address <address>

Use the ip helper-address command to configure the Secure Router OS to forward User Datagram

Protocol (UDP) broadcast packets received on the interface. Use the no form of this command to disable

forwarding packets.

Syntax Description

<address> Specifies the destination IP address (in dotted decimal notation) for the forwarded

UDP packets.

Default Values

By default, broadcast UDP packets are not forwarded.

Command Modes

(config-interface)# Interface Configuration Mode required (applies to all physical interfaces as well as

virtual interfaces)

Functional Notes

When used in conjunction with the ip forward-protocol command, the ip helper-address feature allows

you to customize which broadcast packets are forwarded.

To implement the helper address feature, assign a helper-address(es) (specifying the device that needs to

receive the broadcast traffic) to the interface closest to the host that transmits the broadcast packets.

When broadcast packets (of the specified type forwarded using the ip forward-protocol command) are

received on the interface, they will be forwarded to the device that needs the information.

Only packets meeting the following criteria are considered eligible by the ip helper-address feature:

1. The packet IP protocol is User Datagram Protocol (UDP).

2. Any UDP port specified using the ip forward-protocol command.

3. The media access control (MAC) address of the frame is an all-ones broadcast address (ffff.ffff.ffff).

4. The destination IP address is broadcast defined by all ones (255.255.255.255) or a subnet broadcast

(for example, 192.33.4.251 for the 192.33.4.248/30 subnet).

Note

The ip helper command must be used in conjunction with the ip forward-protocol command

to configure the Secure Router OS forward UDP broadcast packets. See ip

forward-protocol udp <port number> on page 283 for more information.

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HP 7000 dl Router Series Guide de l'utilisateur Page 749

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HP 7000 dl Router Series Guide de l'utilisateur Page 749

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