IP Addressing Commands
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CLI\files\IP_Addressing.fm
D E L L CO N F I D E N T I A L – P R E L I MI N A RY 5/ 1 5 /1 2 - F O R PR O O F O N LY
Syntax
ip helper-address
{
ip-interface | all}
address
[
udp-port-list
]
no ip helper-address
{
ip-interface | all}
address
Parameters
•
ip-interface
—Specifies the IP interface.
•
all
—Specifies all IP interfaces.
•
address
—Specifies the destination broadcast or host address to which to
forward UDP broadcast packets. A value of 0.0.0.0 specifies that UDP
broadcast packets are not forwarded to any host.
•
udp-port-list
—Specifies the destination UDP port number to which to
forward broadcast packets. (Range: 1–65535)
Default Configuration
Forwarding of User Datagram Protocol (UDP) broadcast packets received on
an interface to a specific (helper) address is disabled.
If
udp-port-list
is not specified, packets for the default services are forwarded
to the helper address.
Command Mode
Global Configuration mode
User Guidelines
The
ip helper-address
command forwards specific UDP broadcast packets
from one interface to another.
Many helper addresses may be defined. However, the total number of address-
port pairs is limited to 128 for the device.
The setting of a helper address for a specific interface has precedence over the
setting of a helper address for all the interfaces.
Forwarding of BOOTP/DHCP (ports 67, 68) cannot be enabled with this
command. Use the DHCP relay commands to relay BOOTP/DHCP packets.
The
ip helper-address
command specifies a UDP port number to which UDP
broadcast packets with that destination port number are forwarded. By
