APEmille network
[noe/010827]
Ifh network (141.34.40.*/24)
+----------------------------+
| |
+----------|----------+ |
| apemaster* | |
| | |
| APEMASTER* | |
| | |
| master umaster | |
+---|------------|----+ |
| | | to router and rest
Boot Network Unit Network | of IfH network
192.168.38.*/24 192.168.40.*/23 (!) | ^
| | | |
+------+-----+ | |
| | |
+-----------|----------------------------|--------|-+
| switch |
+-----------|-------------------------|-------------+
| |
+------+-----+ +-----+------+
Boot network | | | | Unit network
+---|------------|----+ +---|------------|----+
| host02 unit01 | | host01 unit03 |
| | | | ... etc.
| HOST02 | | HOST01 |
| | | |
+---------------------+ +---------------------+
Notes:
o The names at the ports indicate the network name associated with the IP address
of that port. The name given in capital letters is the hostname.
o The Boot- and Unit-networks actually share the same physical cable. The
Unit network is implemented as interface aliases with a different IP
address (and network mask). The switch can handle such cases gracefully.
This means that the interface eth0 of each unit is listed twice in
'ifconfig', once as 'eth0' (Boot network) and once as 'eth0:1'
(Unit network). (On apemaster this is eth1 and eth1:1)
o The configuration of the Boot network interfaces is done at boot
time. The Ziatechs actually need this network for booting.
The Unit network is configured at a later stage of booting, since here
the information about the host<->unit assignments is needed and is
taken from /zroot/HostConfig (which is only available after the
automounter has started).
Startup scripts: /etc/rc.d/init.d/APEunitname, /etc/rc.d/APEunitserver
o The 23-bit netmask of the unit-network is just a trick to allow
the unit-number (including 00) to appear as the last part of the
IP number.
o The network names of the Boot- and Unit-networks are not registered
in the name server. Instead they are listed in the /etc/hosts files
of all participating machines.
The name resolution process of linux must be configured to check
files only (units) or dns,nis AND files (apemaster).
o The switch ports are configured to be in either the intranet (Boot- and
Unit-networks) or the Ifh network.
As of 2001/08/20 , only the ports 33,35,37 and 39 are configured for
the IfH network.
