Re: Make ipconfig.c work as a loadable module.

From: Russell King (rmk@arm.linux.org.uk)
Date: Sat Mar 08 2003 - 11:19:36 EST


On Sat, Mar 08, 2003 at 09:07:11AM -0700, Eric W. Biederman wrote:
> With a good bootloader it does not much how big your initrd is. I
> totally agree that small is good and important. At the same time
> ipconfig.c is wrong. It is great during development and on systems
> with a single NIC. But the hard coded policies can be bad for
> production systems. Not that hard coded policies are bad in general
> just the kernel is the wrong place to put them.

With multi-NIC systems, it is perfectly possible to use ipconfig.c with
one specific interface.

/*
 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
 * command line parameter. It consists of option fields separated by colons in
 * the following order:
 *
 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
 *
 * Any of the fields can be empty which means to use a default value:
 * <client-ip> - address given by BOOTP or RARP
 * <server-ip> - address of host returning BOOTP or RARP packet
 * <gw-ip> - none, or the address returned by BOOTP
 * <netmask> - automatically determined from <client-ip>, or the
 * one returned by BOOTP
 * <host name> - <client-ip> in ASCII notation, or the name returned
 * by BOOTP
 * <device> - use all available devices
 * <PROTO>:
 * off|none - don't do autoconfig at all (DEFAULT)
 * on|any - use any configured protocol
 * dhcp|bootp|rarp - use only the specified protocol
 * both - use both BOOTP and RARP (not DHCP)
 */

ip=:::::eth0:dhcp

(I haven't actually tried this though.)

However, how do you configure your ramdisk via the boot loader to use
a specific NIC / mount a specific filesystem, etc?

-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html

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