SROS Command Line Interface Reference Guide
Ethernet Interface Configuration Command Set
5991-2114
© Copyright 2007 Hewlett-Packard Development Company, L.P.
637
ip helper-address
<address>
Use the
ip helper-address
command to configure the SROS 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.
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 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, 192.168.4.251 for the 192.168.4.248/30 subnet).
Usage Examples
The following example forwards all DNS broadcast traffic to the DNS server with IP address 192.33.5.99:
ProCurve(config)#
ip forward-protocol udp domain
ProCurve(config)#
interface eth 0/1
ProCurve(config-eth 0/1)#
ip helper-address 192.168.5.99
Note
The
ip helper-address
command must be used in conjunction with the
ip forward-protocol
command to configure the SROS to forward UDP broadcast packets. See ip
forward-protocol udp <port number> on page 412 for more information.
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