147 lines
3.8 KiB
Groff
147 lines
3.8 KiB
Groff
.TH INET 8
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.SH NAME
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inet, inet.conf \- TCP/IP server
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.SH SYNOPSIS
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.B inet
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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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.B Inet
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is the TCP/IP server. It is a device driver that interfaces between the
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file server and the low level ethernet device driver. The interface to this
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server is described in
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.BR ip (4).
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.PP
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.B Inet
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starts as a normal process, reads a the configuration file
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.B /etc/inet.conf
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to see what it should do, and uses a few special low level system calls
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to turn itself into a server. The format of the configuration file is as
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follows:
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.SS Configuration
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The inet configuration file is fairly simple, here is an example:
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.PP
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.RS
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.ft C
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.nf
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eth0 DP8390 0 { default; };
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psip1;
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.fi
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.ft P
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.RS
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.PP
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It tells that network 0 (the one containing devices
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.BR 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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uses the ethernet device driver handled
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by task "DP8390" at port 0. This network is marked as the default
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network, so most programs use it through the unnumbered devices like
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.B /dev/tcp
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or
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.BR /dev/udp .
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Network 1 is a Pseudo IP network that can be used for
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a serial IP over a modem for instance.
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.PP
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The configuration file may look like a common configuration file as
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described by
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.BR configfile (5),
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but it is currently just a simple subset allowing only what you see here.
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The following network definitions are possible:
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.PP
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.BI eth N
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.I task port
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.RI { options };
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.RS
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This sets up an ethernet with device name
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.BI /dev/eth N\fR,
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built on the given ethernet device driver at the given port at that driver.
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(If a network driver manages two network
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cards then they are at port 0 and 1.)
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.br
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.RE
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.PP
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.BI eth N
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.B vlan
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.I id
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.BI eth M
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.RI { options };
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\0\0\0\0
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.RS
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The ethernet
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.BI eth N
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uses VLAN number
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.I id
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and is built on ethernet
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.BI eth M\fR.
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A packet given to this network has a VLAN tag prefixed to it and is then
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handed over to another ethernet for transmission. Likewise a packet on
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that ethernet carrying the appropriate VLAN tag has this tag removed and is
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sent on to this network. The VLAN ethernet behaves like an ordinary ethernet
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as far as applications are concerned.
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.RE
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.PP
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.BI psip N
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.RI { options };
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.RS
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Creates pseudo IP network
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.BI /dev/psip N\fR,
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usable for IP over serial lines, tunnels and whatnot.
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.RE
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.SH OPTIONS
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Some options can be given between braces.
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.PP
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.BR default ;
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.RS
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Mark this network as the default network. Exactly one of the networks must
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be so marked.
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When
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.B inet
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is started it will check and create all the necessary network devices before
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becoming a server. To know what major device number to use it checks
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.BR /dev/ip ,
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so that device must already exist. It can be created by
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.B MAKEDEV
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if need be.
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.RE
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.PP
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.BR "no ip" ;
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.br
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.BR "no tcp" ;
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.br
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.BR "no udp" ;
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.RS
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These options turn the IP, TCP, or UDP layer off. Inet will not enable the
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devices for these layers, and will deactivate code for these layers.
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Disabling IP will also disable TCP or UDP, because they need IP to function.
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An ethernet without an IP layer can be used as for stealth listening. An IP
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network without TCP or UDP can be used to pester students into creating the
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missing functionality. Keeps them off the streets, and maybe they'll learn
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something.
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.RE
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.SH "SEE ALSO"
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.BR ip (4),
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.BR boot (8).
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.SH NOTES
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The number of networks that can be defined are 2 (Minix-86), 4 (Minix-386)
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or 16 (Minix-vmd). This limits both the total number and the highest
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device number you can use.
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.PP
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Getting a network administrator to give you a trunk or multi-VLAN port to
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run multiple networks on can be a challenge. It questions their idea that
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VLANs are separate networks, while in reality it is just one big ethernet.
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.SH ACKNOWLEDGMENTS
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Cindy Crawford, for providing invaluable help debugging this server.
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.SH AUTHOR
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.ta \w'Manual:'u+2n
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Code: Philip Homburg <philip@cs.vu.nl>
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.br
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Manual: Kees J. Bot <kjb@cs.vu.nl>
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.\"
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.\" $PchId: inet.8,v 1.6 2001/10/08 19:01:35 philip Exp $
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