Dell POWEREDGE M905 - Manual (Page 320)

302 IP Addressing Commands
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Syntax
helper-address ip-address [udp-port-list ]
no helper-address ip-address
• ip-address—Destination broadcast or host address to be used when forwarding UDP
broadcasts. Specify 0.0.0.0 to indicate not to forward the UDP packet to any host.
• udp-port-list—The broadcast packet destination UDP port number to forward. If not
specified, packets for the default services are forwarded to the helper address. (Range: 0-
65535, comma delimited, e.g. 80,100)
Default Configuration
Broadcast packets forwarding to specific addresses is disabled. If no UDP port number is
specified, the device forwards UDP Broadcast packets for the following six services:
• IEN-116 Name Service (port 42)
• DNS (port 53)
• NetBIOS Name Server (port 137)
• NetBIOS Datagram Server (port 138)
• TACACS Server (port 49)
• Time Service (port 37)
Command Mode
Interface Configuration (VLAN) mode
User Guidelines
Many helper addresses can be defined. The maximum number of address-port pairs is up to
128 for the whole device.
The helper-address interface configuration command forwards a specific UDP Broadcast from
one interface to another.
The helper-address interface configuration command specifies a UDP port number for which
UDP Broadcast packets with that destination port number are forwarded.
The helper-address interface configuration command does not enable forwarding packets
using BOOTP/DHCP. To forward packets using BOOTP/DHCP, use the bootpdhcprelay
enable and bootpdhcprelay serverip Global Configuration commands and the show
bootpdhcprelay Privileged EXEC command.
Example
The following example specifies UDP helper address. UDP packets are forwarded to helper
address.