Ip Helper-Address (Interface Config) - Ubiquiti EDGESWITCH ES-24-250W Command Reference Manual

EdgeSwitch CLI Command Reference
Example: To relay DHCP packets received on any interface to two DHCP servers, 10 .1 .1 .1 and 10 .1 .2 .1, use the
following commands:
(UBNT EdgeSwitch)#config
(UBNT EdgeSwitch)(config)#ip helper-address 10.1.1.1 dhcp
(UBNT EdgeSwitch)(config)#ip helper-address 10.1.2.1 dhcp
Example: To relay UDP packets received on any interface for all default ports to the server at 20 .1 .1 .1, use the
following commands:
(UBNT EdgeSwitch)#config
(UBNT EdgeSwitch)(config)#ip helper-address 20.1.1.1
no ip helper-address (Global Config)
no
Use the form of the command to delete an IP helper entry . The command
with no arguments clears all global IP helper addresses .
no ip helper-address server-address [dest-udp-port | dhcp | domain | isakmp |
Format
mobile-ip | nameserver | netbios-dgm | netbios-ns | ntp | pim-auto-rp | rip |
tacacs | tftp | time]
Mode Global Config

ip helper-address (Interface Config)

Use this command to configure the relay of certain UDP broadcast packets received on a specific interface
or range of interfaces . This command can be invoked multiple times on a routing interface, either to specify
multiple server addresses for a given port number or to specify multiple port numbers handled by a
specific server .
Default No helper addresses are configured.
ip helper-address {server-address | discard} [dest-udp-port | dhcp | domain |
Format
isakmp | mobile-ip | nameserver | netbios-dgm | netbios-ns | ntp | pim-auto-rp |
rip | tacacs | tftp | time]
Mode Interface Config
Parameter
server-address
discard
dest-udp-port
port name
Ubiquiti Networks, Inc.
Description
The IPv4 unicast or directed broadcast address to which relayed UDP broadcast packets are sent. The
server address cannot be in a subnet on the interface where the relay entry is configured, and cannot
be an IP address configured on any interface of the local router.
Matching packets should be discarded rather than relayed, even if a global ip helper-address
configuration matches the packet.
A destination UDP port number from 0 to 65535.
The destination UDP port may be optionally specified by its name. Whether a port is specified by its
number or its name has no effect on behavior. The names recognized are as follows:
dhcp
• Port 67
• domain Port 53
• isakmp Port 500
mobile-ip
• Port 434
• nameserver Port 42
• netbios-dgm Port 138
netbios-ns
• Port 137
• ntp Port 123
pim-auto-rp
• Port 496
rip
• Port 520
• tacacs Port 49
tftp
• Port 69
time
• Port 37
Other ports must be specified by number.
Routing Commands
no ip helper-address
354