NETINSTL.TXT
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- Compiling and using Minix network support
-
- modified: Sun Sep 1 11:20:02 EDT 1996
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-
- _________________________________________________________________
-
-
- Q: How do I build TCP/IP support into the kernel?
-
- A: Actually, the changes to the kernel itself are small. The ethernet
- driver code is compiled and the kernel is enabled to communicate with
- the INET server, which runs outside of the kernel with the same
- priority as the MM and FS servers.
-
- To compile a network-capable Minix system you must edit
- /usr/include/minix/config.h. as described below and then cd to
- /usr/src/tools and type "make". A new Minix system will be created as
- /usr/src/tools/image. The new system will include the inet server.
-
- The minimum change to config.h is to set ENABLE_NETWORKING to 1. If
- you want to be able to do remote logins with rlogin or telnet you need
- to change NR_PTYS to a value greater than zero. If two or more users
- are likely to be active at once you may need to increase NR_PROCS
- from its default value of 32. NR_PTYS 8 and NR_PROCS 64 seems to work
- well for a system that has two or three users logged in at the same
- time. These changes will increase the size of the kernel, and if you
- are compiling for a system with limited memory you might want to first
- try a system with no ptys and only the default 32 processes.
-
- Once the new system image is compiled you can move it to the root
- directory as /minix.net. Then you can test it by specifying
- image=minix.net at the boot manager prompt. If it works correctly you
- can either rename it as /minix or save the image boot parameter. If
- you have limited memory you may want to keep the original system image
- available to boot when you want to do something that requires a lot of
- memory, like recompiling a system.
-
- Q. Having compiled a networking kernel, how do I use it?
-
- A. There are a few more steps after compiling before you can use the
- network capabilities.
-
- 1. In /dev you probably already have /dev/eth, /dev/ip, /dev/tcp, and
- /dev/udp defined, but if they are missing you need to create them with
- MAKEDEV. If you have set NR_PTYS to a number greater than 0 you should
- also create /dev/ttyp0, /dev/ptyp0, etc., with MAKEDEV.
-
- 2. In order for the ethernet driver to be enabled you must add to the
- boot parameters a line like DPETH0=on or DPETH0=I/O-addr:irq:mem-addr.
- The first form can be used if the ethernet adapter uses the default
- settings of 280:3:d0000. If the defaults are used serial line two will
- be disabled, since it also needs IRQ 3. A setting of 280:5:d0000 is
- recommended if IRQ 5 is free, which is usually the case on AT-class
- machines. Of course the ethernet card must be set up for the
- parameters you tell Minix.
-
- 3. Finally, you may want to review the network initialization
- performed by /etc/rc. The default /etc/rc is suitable for a Minix
- system running on a large network with sophisticated servers
- available, and in this context it allows a Minix system to discover
- its own name and address without any editing of the configuration
- files. This is very useful for a university laboratory where a large
- number of Minix systems may be in use, but it is not optimal for a
- small network with a few small systems, all of which may not be
- operating all the time. On a system with limited memory it is also
- useful to reduce the number of network daemons that are started.
- Copies of various configuration files I use on minix1.hampshire.edu
- are in that system's anonymous ftp area, in /pub/mx.config.samp.
-
- --------------------------------
- Albert S. Woodhull
- Hampshire College, Amherst, MA
- awoodhull@hampshire.edu
- http://minix1.hampshire.edu/asw
-