Cabletron Systems HSIM-W6 - Manual (Page 163)

Chapter 7: General Configuration Using Local Management
HSIM-W6 User’s Guide 149
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 field under System Level Setup.
2. ENTER the UDP port number of the UDP service request packets that you want to redirect
(refer to
Table 23 ) and then press ENTER.
3. Use the arrow keys to highlight the SAVE command at the bottom of the screen and then press
ENTER. The message “SAVED OK” displays.
The entry for the UDP Port field 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.
In order for one IP host to communicate with another IP host, 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 - command
at the bottom of the screen to scroll through a list of commonly used UDP port
numbers. To use the
+ REDIRECTOR - command, 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.