Edge-Core ECS4660-28F Management Manual page 1661

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This command specifies the application server or subnet (indicated by a

ip helper-address

directed broadcast address) to which designated UDP broadcast packets

are forwarded. Use the no form to remove a UDP helper address.

Interface Configuration (VLAN)

[no] ip helper-address ip-address

ip-address - Host address or directed broadcast address to which

UDP broadcast packets are forwarded. (Range: 1-65535)

Up to 20 helper addresses can be specified with this command.

To forward UDP packets with the UDP helper, the clients must be

connected to the selected interface, and the interface configured with

an IP address.

The UDP packets to be forwarded must be specified by the

protocol udp

command, and the packets meet the following criteria:

The MAC address of the received frame must be all-ones broadcast

address (ffff.ffff.ffff).

The IP destination address must be one of the following:

all-ones broadcast (255.255.255.255)

subnet broadcast for the receiving interface

The IP time-to-live (TTL) value must be at least 2.

The IP protocol must be UDP (17).

The UDP destination port must be TFTP, Domain Name System

(DNS), Time, NetBIOS, BOOTP or DHCP packet, or a UDP port

specified by the

ip forward-protocol udp

If a helper address is specified with this command, but no UDP ports

have been specified with the

broadcast traffic for several UDP protocol types will be forwarded by

default as described under the

| IP Interface Commands

ip forward-protocol udp

IPv4 Interface

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