Brother MFC 5840CN - Manual (Page 24)

FRONT PANEL SETUP 3 - 3
NC9100h_FM6.0
RARP mode
Brother Print/Scan server IP address can be configured using the
Reverse ARP (RARP) facility on your host computer. This is done by
editing the /etc/ethers file (if this file does not exist, you can create it)
with an entry similar to the following:
00:80:77:31:01:07 BRN_310107
Where the first entry is the Ethernet address of the Print/Scan server
and the second entry is the name of the Print/Scan server (the name
must be the same as the one you put in the /etc/hosts file).
If the rarp daemon is not already running, start it (depending on the
system the command can be rarpd, rarpd -a, in.rarpd -a or something
else; type man rarpd or refer to your system documentation for
additional information). To verify that the rarp daemon is running on
a Berkeley UNIX-based system, type the following command:
ps -ax | grep -v grep | grep rarpd
For AT&T UNIX-based systems, type:
ps -ef | grep -v grep | grep rarpd
The Brother Print/Scan server will get the IP address from the rarp
daemon when it is powered on.