Web Management Guide-R06

Table Of Contents
Chapter 16
| IP Services
Forwarding UDP Service Requests
– 668 –
To show the configured UDP destination ports:
1. Click IP Service, UDP Helper, Forwarding.
2. Select Show from the Action list.
Figure 437: Showing the UDP Destination Ports
Specifying the
Target Server
or Subnet
Use the IP Service > UDP Helper > Address page to specify the application server or
subnet (indicated by a directed broadcast address) to which designated UDP
broadcast packets are forwarded.
Command Usage
Up to 20 helper addresses can be specified.
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 in the IP Service > UDP
Helper > Forwarding page, and the packets meet the following criteria:
The MAC address of the received frame must be the 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 on the
IP Service > UDP Helper > Forwarding page.
If a helper address is specified on this configuration page, but no UDP ports
have been specified on the IP Service > UDP Helper > Forwarding page,
broadcast traffic for several UDP protocol types will be forwarded by default as
described on page 667.