233 lines
5.5 KiB
Groff
233 lines
5.5 KiB
Groff
.TH SERIAL-IP 8
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.SH NAME
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serial-ip \- Serial IP (SLIP or PPP) setup
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.SH DESCRIPTION
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.de SP
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.if t .sp 0.4
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.if n .sp
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..
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\-\-\-\-\-\-\-
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.br
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.B Note:
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This text and the serial IP code is not finished. Code needs to be added to
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.B nonamed
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to allow it to be used both with and without a connection to the Internet,
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and by now there is a PPP program for standard MINIX 3 "out there" that will
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change everything that is said in this text. So much to do, so little
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time...
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.br
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\-\-\-\-\-\-\-
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.PP
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This manual page describes the MINIX 3 network setup to use serial line IP.
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The serial IP protocol used can either be the older SLIP by means of the
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.BR slip (8)
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program, or PPP (Point-to-Point Protocol), the newer and better serial IP
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protocol implemented by the
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.BR ppp (8)
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program. Alas standard MINIX 3 only supports SLIP.
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.PP
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In the following text all descriptions and examples will name SLIP or the
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.BR slip
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program, but one may just as well read PPP or
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.BR ppp .
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Where necessary the differences will be noted.
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.PP
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A typical use of the
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.B slip
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program is like this:
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.PP
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.RS
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.B "slip /dev/psip2 </dev/tty01 >/dev/tty01"
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.RE
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.PP
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The argument of the program, the
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.B /dev/psip2
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device, is one of the so-called "Pseudo IP" devices that the MINIX 3 TCP/IP
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driver
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.BR inet (8)
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offers to implement a virtual network on. On an ethernet IP packets are
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received or transmitted by the ethernet card, but packets on a pseudo IP
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network are channeled back to or received from a program running in user
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space, such as
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.BR slip .
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Standard input and output are used by
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.B slip
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to exchange packets with another SLIP implementation. This is normally
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through an RS-232 serial line like the second serial line
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.B /dev/tty01
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as used in the example above.
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.PP
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If we look at the flow of data over normal ethernet then this is what a TCP
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connection between two MINIX 3 machines,
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.B telnet
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for instance, looks like:
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.PP
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.in 0
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.ce 13
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[telnet]
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/dev/tcp0
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inet
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[ethernet]
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inet
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/dev/tcp0
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[in.telnetd]
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.PP
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One-half (!) of a SLIP connection would look like this:
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.PP
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.in 0
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.ce 12
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[telnet]
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/dev/tcp2
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inet
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/dev/psip2
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slip
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[serial line]
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\&...
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.SS "Configuration for a SLIP network only"
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It is important to know that as far as
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.B inet
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is concerned the pseudo IP network is just another network, nothing special.
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So you have to convince
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.B inet
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that it has to send packets out over that network. One does this by
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setting a default route that makes
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.B inet
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believe that there is a router somewhere on the pseudo-IP network.
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.PP
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Assume your machine has been given the IP address
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.B 192.168.0.13
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by your service provider. Let's choose another address on that network,
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.B 192.168.0.1
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for instance. (You can use the address of the SLIP gateway if you want
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to make it look pretty, but it doesn't really matter, anything "out there"
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is ok.)
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To make MINIX 3 aware of the situation you have to configure the pseudo IP
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network. For Minix-vmd you need to look for the
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.B if-then-else-fi
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code in
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.B /usr/etc/rc
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that tests if
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.B /etc/rc.net
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should be run. Copy the lines in the
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.B else
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clause that starts network daemons to
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.B /etc/rc.net
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and add the following lines to make it look like this:
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.PP
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.RS
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.nf
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# My SLIP interface address.
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ifconfig -h 192.168.0.13 -n 255.255.255.0
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.SP
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# Standard network daemons.
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daemonize rarpd $named irdpd rip inetd
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.SP
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# Default route to the outside world.
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add_route -g 192.168.0.1
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.fi
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.RE
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.PP
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For standard MINIX 3 one has to edit
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.B /etc/rc
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instead at the point of the XXX comments. The
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.B ifconfig
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goes at the first XXX, the
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.B add_route
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at the second XXX. The result is conceptually the same as the example
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above. The important thing is the order: Configuration, Daemons, Routes.
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(First give addresses to the networks, let the daemons meditate over the
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results and possibly configure more networks (rarpd), then add routes to
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the configured networks.)
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.PP
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Just one thing left to do. The system uses the first ethernet network
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.RB ( eth0 ,
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.BR ip0 ,
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.BR tcp0 ,
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and
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.BR udp0 )
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as the default network. With the program
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.BR netdefault (8)
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you have to change the links to the default devices
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.RB ( eth / psip ,
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.BR ip ,
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.BR tcp ,
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and
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.BR udp )
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to point to the first pseudo IP network
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.RB ( psip2 ,
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.BR ip2 ,
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.BR tcp2 ,
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and
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.BR udp2 ):
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.PP
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.RS
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.B "netdefault psip2"
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.RE
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.PP
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In
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.B /etc/hosts
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list at least
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.B localhost
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and the name of your machine with its SLIP address. This way your machine
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will boot and know its own name. Now you need to find a way to let your
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system know the addresses of other machines. There are three ways:
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.PP
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.RS
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List the names and addresses of any other machine you wish to talk
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to in
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.BR /etc/hosts .
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Drawback: This will quickly become a pretty long list.
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.SP
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Create an
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.B /etc/resolv.conf
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that lists a nameserver at your ISP and
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.B 127.0.0.1
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(localhost). Drawback: With the SLIP link down it takes 5 to 10 seconds for
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a name lookup to time out on the remote name server before the local name
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server is tried.
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.SP
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Install the above
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.B /etc/resolv.conf
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when
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.B slip
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is started, and remove it when
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.B slip
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exits. Drawback: Long running programs only read
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.B /etc/resolv.conf
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at startup, so they don't notice it changing.
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.SP
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Run a real Internet name daemon from the
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.B named
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package. Drawback: Nontrivial to set up.
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.SS "Configuration for a SLIP - Ethernet router (simple case)"
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XXX
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.SS "Configuration for a SLIP - Ethernet router (complex case)"
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XXX
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.SH FILES
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.TP \w'/dev/psip*'u+5n
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.B /dev/psip*
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Pseudo-IP devices for use by
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.BR slip
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and
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.BR ppp .
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.SH "SEE ALSO"
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.BR boot (8),
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.BR inet (8),
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.BR netdefault (8),
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.BR term (1),
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.BR chat (1).
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.SH BUGS
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.SH AUTHOR
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Kees J. Bot (kjb@cs.vu.nl)
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