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ANU users dialing in via OzEmail are assigned to a different subnet which uses a link to CARNO. To be assigned to this subnet you must set up PAP (Password Authentication Protocol) correctly on your computer. PAP is an authentication scheme that runs under PPP. You can reach the ANU using PPP without PAP, but you will be on the slower subnet.
If you are on the slower subnet, your computer will be given a name
similar to
slcan2p13.ozemail.com.au
(This is on the 203.108.192 subnet).
If you are on the CARNO subnet, your computer will be given a name
similar to
h194.anu.uniras.aust.com
(This is on the 203.108.55 subnet).
You can check the IP address you were assigned using the
ifconfig ppp0 command. You can also check your computer's
name by telneting to a Unix host at the ANU and using
last | less
to display where you are logged in from.
For PPP to work on your computer you must have two things installed
2. Check that your kernel supports ppp.
Support for PPP can either be compiled directly into your kernel or as a
loadable module. If ppp is compiled into the kernel the output from
the dmesg command should contain lines similar to...
PPP: version 2.3.3 (demand dialling)
PPP line discipline registered.
If ppp is compiled as a module, you won't see it in the output from dmesg
unless the module has been loaded. Check for the ppp module by typing
modprobe -l | grep ppp
The output should contain something similar to this:
/lib/modules/2.2.5-22/net/ppp.o
If the kernel doesn't support ppp you will need to recompile it.
(See instructions in
LDP documentation).
You also need to create
This is the minimum setup for ppp. After creating these files you
should be able to type
pppd call ozemail
and establish a ppp connection.
(Most of these instructions were written under the assumption that you
have become root before dialling in. However it is possible to set
things up so that you can dial in as any user. See here).
Try ping, telnet or rlogin and see if you get a response from a computer running Unix at the ANU. Also see if your browser can connect to your favourite web site. If you have problems, see the troubleshooting section. When you have established a ppp connection, set your browser's automatic proxy configuration to http://www.uniras.aust.com/university/proxy.pac
When you want to shut down the ppp connection, type
killall pppd
Note: If there is a problem with your setup, it is possible
that a PPP session will not be established, but the connection to
OzEmail remains open. If this happens killall pppd will not
cause the modem to hang up. In this case try typing
echo ATH > /dev/modem
and if that doesn't work, turn your modem off or pull out the phone
plug. You need to make sure you are not being charged for an open
connection to OzEmail that you are not using!
If your version of pppd does not support the call option, you could try invoking pppd as follows Substituting your own user name for "amcbeal"):
pppd connect 'chat -v -f /etc/ppp/ozemail-chat' /dev/cua1 38400 debug \ crtscts modem defaultroute noauth user amcbealIf this all seems like too much to type, put the pppd command you use into a script.
There a few refinements you can make to this basic setup. These are described in the refinements page.
The pppd call ozemail command causes options to be read from /etc/ppp/peers/ozemail after the above files are processed. This allows the system administrator to set default options in /etc/ppp/options and to add to or reverse these options for particular ISPs in files /etc/ppp/peers/ozemail, /etc/ppp/peers/bigpond etc.
The auth line in the options file might seem unnecessary. What is does is demand that the remote computer (the peer) authenticate itself before your computer will allow a ppp connection. However an ISP will not authenticate itself to you! This option is overridden in the /etc/ppp/peers/ozemail file, using the noauth option. This relaxes security for ozemail but retains it for other systems trying to establish a ppp connection with you. See the SECURITY section of the pppd man page.
This line from peers/ozemail
chat -v -f /etc/ppp/ozemail-chatcalls the chat program and tells it to use the /etc/ppp/ozemail-chat. script.
Most of the lines in a chat script are expect - send pairs of
strings, separated by spaces. In other words, the program expects to
receive one of the strings on the left (from your modem or ISP), and
when it does, it sends the corresponding string on the right. The
script used here has each expect
- send pair on a separate line. This is only to improve readability
and is not compulsory. Since spaces are used to separate strings,
those strings containing spaces must be quoted. Chat accepts either
single or double quotes and doesn't mind if you quote single words, so
for example the strings
name: amcbeal 'name:' 'amcbeal' "name:" "amcbeal"are equivalent. The case of an empty string is handled by a pair of single or double quotes with nothing between them.