Enabling RARP

RARP (Reverse Address Resolution Protocol) can be used to establish

communications. The printer broadcasts its Ethernet address across the

network, and receives its internet address from the ﬁrst host to respond.

1.

If the

rarpd

daemon is started within the

/etc/rc.local

ﬁle or a

similar startup ﬁle, it is always running and waiting for RARP

broadcasts. If the

rarpd

command line does not exist in your

/etc/rc.local

ﬁle, you need to add it. To verify that the

rarpd

startup

command is in the ﬁle, type:

grep rarpd /etc/rc.local

If the

rarpd

startup command is in the ﬁle, this line is displayed:

/usr/etc/rarpd -a ;echo -n ’ rarpd’

2.

Verify that

rarpd

resides where it is speciﬁed in

/etc/rc.local.

For the

preceding examples,

rarpd

would be located in

/usr/etc

. If there is a

mismatch between the actual location and the speciﬁed location,

either move the

rarpd

binary or change the

/etc/rc.local

ﬁle.

3.

Edit the

/etc/hosts

ﬁle to add the printer internet addresses and

names. This example adds two Phaser 340 printers to the

/etc/hosts

ﬁle:

128.07.60.30 P340-mktg

128.07.60.31 P340-sales

4.

Edit the

/etc/ethers

ﬁle to add the printer Ethernet addresses and

names:

08:00:11:01:00:45 P340-mktg

08:00:11:01:00:46 P340-sales

5.

Some hosts require an explicit update to the

arp

table to add new

entries. This command is host-speciﬁc; check your host

documentation for details. For example, the following command

lines add the Ethernet addresses of two Phaser 340 printers to the

arp

table:

arp -s ether P340-mktg 08:00:11:01:00:45

arp -s ether P340-sales 08:00:11:01:00:46

The

ether

switch indicates an Ethernet address. The

arp

command can be

run with a

-f

ﬁlename

option, where

ﬁlename

is a ﬁle of the printer entries

to set.

6.

Restart the

rarpd

daemon without rebooting the system to put the

changes you have made into effect. Use one of the following

methods.

For BSD systems

a.

Find out the process ID number for the

rarpd

daemon; type:

ps -aux | grep

rarpd

This command produces the following output:

root 193 0.0 0.0 48 0 ? IW Oct 24

0:12 rarpd

root 12366 0.0 0.3 32 196 pb S 11:55

0:00 grep rarpd

b.

Restart the

rarpd

daemon, which is process ID number 193 in

this example. Type:

kill -HUP 193

For System V

a.

Find out the process ID number for the

rarpd

daemon; type:

ps -ef | grep

rarpd

This command produces the following output:

root 6206 3112 0 Nov 06 - 0:00

/etc/rarpd

root 13177 12135 2 06:36:22 pts/3 0:00 grep

rarpd

b.

Restart the

rarpd

daemon, which is process ID number 6206 in

this example. Type:

kill -HUP 6206

7.

If

rarp

is not running, type:

/usr/etc/rarpd -a &

Source: 070-9538-00 AB