Ip Helper-Address - Allied Telesis IE220 Series Manual

IP A P
DDRESSING AND ROTOCOL
-
IP HELPER ADDRESS

ip helper-address

Overview Use this command to add a forwarding destination address for IP Helper to enable
forwarding of User Datagram Protocol (UDP) broadcasts on an interface.
Use the no variant of this command to disable the forwarding of broadcast packets
to specific addresses.
Syntax ip helper-address <ip-addr>
no ip helper-address <ip-addr>
Default The destination address for the ip helper-address command is not configured by
default.
Mode Interface Configuration for a VLAN interface or a local loopback interface.
Usage notes Combined with the
mode, the ip helper-address command in interface mode allows control of which
protocols (destination port numbers) are forwarded. The ip forward-protocol
udp command configures protocols for forwarding, and the ip helper-address
command configures the destination address(es).
The destination address can be a unicast address or a subnet broadcast address.
The UDP destination port is configured separately with the ip forward-protocol
udp command. If multiple destination addresses are registered then UDP packets
are forwarded to each IP address added to an IP Helper. Up to 32 destination
addresses may be added using IP Helper.
The device will only forward the types of UDP broadcast packets that are specified
by the ip forward-protocol command(s). The device does not forward any other
UDP packet types by default.
The ip helper-address command does not support BOOTP / DHCP Relay. For this
reason, you may not configure UDP ports 67 and 68 with the ip forward-protocol
command.
See the
DHCP Relay.
Examples The following example defines IPv4 address 192.168.1.100 as an IP Helper
destination address to which to forward UDP broadcasts received on vlan2:
awplus#
awplus(config)#
awplus(config-if)#
C613-50644-01 Rev B
C
OMMANDS
Parameter
<ip-addr>
ip forward-protocol udp
IP Feature Overview and Configuration Guide
configure terminal
interface vlan2
Command Reference for IE220 Series
AlliedWare Plus™ Operating System - Version 5.5.3-0.x
Description
Forwarding destination IP address for IP Helper.
command in global configuration
ip helper-address 192.168.1.100
for more information about
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