ADTRAN 1000R Series

Command Reference Guide Demand Interface Configuration Command Set

ip helper-address <address>

Use the ip helper-address command to configure the AOS 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 th e destination IP a ddress (in dotted decimal not ation) for the forwarded

UDP packets.

Default Values

By default, broadcast UD P packets are not forwarde d.

Applicable Platforms

This command applies to the NetVanta 1000R, 3000, 4000, and 5000 Series units.

Command History

Release 1.1 Command was introduced.

Release 11.1 Command expanded to include the demand interface.

Functional Notes

When used in conjunction with the ip forwa r d-protocol command, the ip helper-address feature allows

you to customize which broadcast packets are forwarded.

To implement the helper address feature, assig n a helper addre ss(es) ( specifying th e 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 su bnet).

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

command to configure the AOS to forward UDP broadcast packets. Refer to ip

forward-protocol udp <port number> on page 425 for more information.