Setting Up The Mail System - Sun Microsystems Sun Workstation 100U System Manager's Manual

System Set-Up and Operation
Sun 100/150 Installation Manual
2. A second solution is to retain your Class A addressing scheme from 1.0, but make sure all
host numbers are smaller than 1024, so that ARP can be performed.
As above, this means editing / etc/ holt, and assigning each machine a host number - the
last component of the entire address - under 1024. You can simply retain your old network
number. Remember to install the /etc/holt, file on all systems, and to reboot any machine
w hose host number you have changed.
3. Finally, if you have machines that either cannot perform ARP (old Vaxen, for example), or
cannot respond to ARP (older Sun systems with Class A networks and host numbers
greater than 1024, for example), proceed as follows.
You can allow machines which cannot perform ARP talk to a 1.1 network by 'forcing' your
1.1 machines to respond to an address which non-ARPers understand. Do this by editing
the / etc/ rc.local file on each 1.1 machine, and adding an extra 'ifconfig' line with each 1.1
machine's 'old' 6-byte hexadecimal Ethernet address:
a) You can obtain this address for a 3COM Ethernet Board by using the PROM Monitor
to interrogate the Multibus memory-space where the address is stored. As super-user,
run the following sequence of commands (type <RETURN> where indicated):
#=
/etc/fasthalt
syncing disks ... done
Unix Halted
>
kl
>
e fe0400
> FE0400: 0260r <RETURN>
> FE0402: 8COOr <RETURN>
> FE0404: 9920r q
b) Then) edit the / etcl rc.local file) and add the following line, substituting the machine's
entire 6-byte hexadecimal Ethernet address for old_ethernet_addre,,:
/etc/ifconfig ecO old_ethernet_addre" 'hostname' -trailers up
For instance, the lines for the machine used in the example above might look like this:
/etc/ifconfig ecO 'hostname' --trailers up
/etc/ifconfig ecO 2:60:8C:0:99:20 'hostname' -trailers up
c) Finally, reboot any machine whose file you have altered in this way.
If you have machines that will not respond to ARP, you can use the / etc/ arp command
to
specify the Ethernet addresses for the machines (see arp(8».
6.2. Setting Up the Mail System
The mail system consists of the following commands and files:
6-6
Revision H of 12 March 1984