Udp Helper Configuration; Introduction To Udp Helper; Configuring Udp Helper - HP A7500 Series Configuration Manual

UDP Helper configuration

NOTE:
interface
The term
(or Layer 3) Ethernet ports. You can set an Ethernet port to operate in route mode by using the port
link-mode route command (see

Introduction to UDP Helper

UDP Helper functions as a relay agent that converts UDP broadcast packets into unicast packets and
forwards them to a specified destination server. This is helpful when a host cannot obtain network
configuration information or request device names through broadcasting because the server or host to be
requested is located on another broadcast domain.
With UDP Helper enabled, a device decides whether to forward a received UDP broadcast packet
according to the UDP destination port number of the packet.
If the destination port number of the packet matches the one pre-configured on the device, the
•
device modifies the destination IP address in the IP header, and then sends the packet to the
specified destination server.
If the destination port number of the packet does not match the one pre-configured on the device,
•
the device sends the packet to the upper layer protocol for processing.

Configuring UDP Helper

Follow these steps to configure UDP Helper:
To do...
Enter system view
Enable UDP Helper
Enable the forwarding of packets
with the specified UDP destination
port number(s)
Enter interface view
Specify the destination server to
which UDP packets are to be
forwarded
in this document refers to Layer 3 interfaces, including VLAN interfaces and route-mode
Layer 2—LAN Switching Configuration Guide
Use the command...
system-view
udp-helper enable
udp-helper port { port-number | dns |
netbios-ds | netbios-ns | tacacs | tftp
| time }
interface interface-type
interface-number
udp-helper server ip-address
97
).
Remarks
—
Required
Disabled by default.
Required
No UDP port number is specified
by default.
—
Required
No destination server is
specified by default.