Nokia Network Voyager, Reference Manual

Page: 452 / 700

8
Configuring Router Services
454 Voyager Reference Guide
It is not possible to pass BOOTP UDP packets using the IP Broadcast helper
(UDP port 67). The reason for this is that the BOOTP functionality on a router
is different from generic UDP packet forwarding to a specified IP address.
While the IP Broadcast Helper simply forwards the UDP packet to the IP
address without modification, the BOOTP implementation is more complex.
Below is a quick explanation of BOOTP forwarding in a router:
Client--> Sends broadcast bootp packet ---->[router] ---->Sends modified
packet to server
The router will modify the packet by inserting its IP address in the
giaddr
field of the BOOTP packet (this is needed for the server to identify the
network where the packet originated).
Note
See RFC1542 section 4 for further information.
Configuring IP Helper Services
1. Click C
ONFIG
on the home page.
2.
Click the IP Broadcast Helper link in the Router Services section.
3.
Click the
ON
radio button for each interface you want to support IP Helper
service. Click A
PPLY
.
4.
(Optional) If you want to add a new UDP Port to the helper services, enter
the new UDP port number in the
N
EW
UDP P
ORT
edit box. Click A
PPLY
.
5.
(Optional) If you want to add a new server to a UDP port, enter the new
server IP address in the
N
EW
A
DDRESS FOR
UDP P
ORT X
edit box.
Click A
PPLY
.
6.
Verify that each interface, UDP port, or server is enabled (
ON
radio button
checked) or disabled (
OFF
radio button checked) for IP helper support
according to your needs.
To make your changes permanent, click S
AVE
.