User Guide

IP Configuration Screen

Local Management User’s Guide 1-39

The UDP Broadcast Redirector enables you to conﬁgure any Routing Services enabled device to

forward the UDP packets that it receives as LAN broadcasts, directly to the appropriate server.

UDP service requests that are sent as LAN broadcasts by clients of applications such as Host

Name, Domain Name, and Bootstrap servers, can be redirected to any server on any network

segment.

To conﬁgure the UDP Broadcast Redirector, complete the following steps:

1. Use the arrow keys to highlight the UDP Port option under System Level Setup.

2. Enter the UDP port number of the UDP service request packets that you want to redirect (refer

to Table 1-4) and then press ENTER.

3. Use the arrow keys to highlight the SAVE command field at the bottom of the screen and then

press ENTER. The message “SAVED OK” displays.

The entry for the UDP Port option reﬂects the UDP port number that is currently selected. The

entry for UDP Type names the UDP service to which that port number corresponds.

Enabling Proxy ARP on a Port

By default, Proxy Address Resolution Protocol (ARP) is disabled on all ports, and IP Routing

Services respond only to ARP requests addressed to its own IP address.

For one IP host to communicate with another IP host, knowledge of the target host’s MAC address

must be known. To learn this MAC address, the IP host sends an ARP request packet as a LAN

broadcast with the destination IP address of the target IP host. All hosts receive this broadcast and

the one host that matches the target IP address responds with its MAC-layer address.

However, because each subnet constitutes a separate broadcast domain and LAN broadcasts are

not forwarded across routers, ARP does not work beyond a host’s local network or subnetwork.

One of the primary purposes of a router is to conﬁne LAN broadcast trafﬁc to each local network

or subnetwork.

NOTE

You can type in the UDP port number, or you can use the +REDIRECTOR- option at

the bottom of the screen to scroll through a list of commonly used UDP port numbers.

To use the +REDIRECTOR- option, use the arrow keys to highlight the + (to go

forward), or the - (to go backward), and then press the ENTER key to scroll in the

direction that you selected.