3Com 8807 Configuration Manual page 734

734 C 63: UDP H
HAPTER ELPER
C
ONFIGURATION
Table 674 Configure UDP helper
Operation
Specify the UDP ports whose
packets need to be forwrded
Enter VLAN interface view
Configure the destination
server to which the UDP
packets are forwarded
Table 675 shows the list of default UDP ports.
Table 675 List of default UDP ports
Protocol
Trivial file transfer protocol (TFTP)
Domain name system (DNS)
Time service
NetBIOS name server (NetBIOS-NS)
NetBIOS datagram server (NetBIOS-DS)
Terminal access controller access control system (TACACS)
Command
udp-helper port { port | dns |
netbios-ds | netbios-ns |
tacacs | tftp | time }
Interface Vlan-interface
interface -number
udp-helper server ip-address
Description
Optional
1 When the function is
enabled, the broadcast
packets of the default UDP
ports are unicast to the
corresponding destination
server. Refer to Table 675
for the list of default UDP
ports.
2 The system supports up to
256 UDP ports.
3 The UDP port number is in
the range of 1 to 65,535.
UDP broadcast packets of
port 0, port 67, and port
68 cannot be forwarded.
-
Required
Up to 20 destination
■
servers are corresponding
to a VLAN interface.
Suppose a destination
■
server is configured on a
VLAN interface. When the
function of forwarding
UDP broadcast packets is
enabled, all the broadcast
packets received on the
VLAN interface from the
specified UDP ports are
unicast to the destination
server corresponding to
the VLAN interface.
By default, the destination
■
server to which the UDP
packets are forwarded is
not configured.
UDP port number
69
53
37
137
138
49