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W&T
TCP/IP Configuration
3.3 Assigning the IP using an RARP server
UNIX environments in particular often use the RARP protocol
for centralized assignment of IP addresses. This means that
TCP/IP devices that want to obtain an IP address send RARP
requests with their Ethernet address as a broadcast over the
network.
Activate the RARP server on the UNIX system and enter in
the file
/etc/ethers the Ethernet address of the LAN-Modem,
and in the file /etc/hosts enter the IP address.
58xxx [Model]
EN=00c03d004a05
OK xxxxxx
Ethernet address
The LAN-Modem must be located in the same subnet as the
RARP server.
Example:
Your LAN-Modem has MAC address EN= 00C03D0012FF
(sticker on the unit). You want to give it IP address
172.16.231.10 and the alias name WT_1:
• Entry in the file /etc/hosts :
172.16.231.10 WT_1
• Entry in the file /etc/ethers :
00:C0:3D:00:12:FF WT_1
If the IP address for the LAN-Modem is 0.0.0.0 (=Factory
Defaults), RARP broadcasts are cyclically generated in
order to obtain a valid address from any existing RARP-
Daemon.
If the Com-Server already has a valid IP address, an RARP
broadcase is generated after every reset. If a reply comes
w i t h i n 5 0 0 m s , t h e I P a d d r e s s e d c o n t a i n e d i n i t i s
accepted. As in the case of assigning through the serial
port, this method also makes it possible to overwrite a
current IP address.