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README for "where2-9.sh" shell script
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PURPOSE OF SCRIPT

A portable PC typically needs to operate in multiple
networking environments, e.g. home, office, remote dial-up.
Each of these environments has its own unique settings for

	hostname / hosts
	device IP addresses
	gateway device/address
	DNS
	interfaces (eth0, eth1, rfcomm0...).

This script allows you to switch networking settings in two different ways:

	1. 	Without shutting down the computer.  This mode is used to switch to/from a
		remote dial-up setting whilst in the office or at home.  Useful if the network
		is down. If you use this mode, you MUST return to the same environment you
		came from, ie. home-remote-home and office-remote-office are both OK,
		office-remote-home is not OK.
		
	2.	With full shutdown.  This mode is required if you are moving the computer 
		from home to office, or office to home.  In that situation, it is necesary to 
		change the hostname and IP address and a full shutdown seems to be required 
		(at least I have not found a way of doing it "on the fly" without serious host 
		misconfiguration..!).  Please DO NOT select the remote option if you are 
		shutting down - it will cause all kinds of problems when the computer starts up 
		again...


PRE-REQUISITES

You will need to know exactly the network settings for home and office before 
going any further.  Make sure you have a working configuration for each.  Print 
out the contents of each of the following files, first when you are working at 
home, then when you are working at the office:

	/etc/sysconfig/network
	/etc/sysconfig/network-scripts/ifcfg-eth0
	/etc/resolv.conf
	/etc/sysconfig/networking/profiles/default/resolv.conf
	/etc/hosts

Create additional versions of ALL the above files, suffixed ".home" and
".office" with the appropriate settings in each.  For example, the two
additional files for /etc/sysconfig/network will be:

	/etc/sysconfig/network.home
	/etc/sysconfig/network.office

Move the two files you created in /etc/sysconfig/network-scripts
(ifcfg-eth0.home and ifcfg-eth0.office) into a new directory named
/etc/sysconfig/tmp/

Create a new file /etc/resolv.conf.remote with a single line:

	nameserver 127.0.0.1
	
(this assumes you have BIND running on your machine: if not, set the nameserver 
IP to 0.0.0.0)

Create a new file /etc/sysconfig/network.remote containing the following lines:

	NETWORKING=yes
	HOSTNAME="enteryourhostname.yourdomain"
	GATEWAY=0.0.0.0
	GATEWAYDEV="ppp0"

You should now have all the required files.  If not, you will get error messages 
when you run "where2-9.sh".

RUNNING THE "where2-9" SCRIPT (MUST BE RUN su root)

Simply cd to the directory where the script is stored, and enter:

	sh where2-9.sh
	
If you have problems, make sure you have read and implemented everything above
before contacting me!  However, I may have missed out something important, so 
all feedback will be appreciated.
________________________________

Jeremy Thompson
mail@jeremythompson.uklinux.net
________________________________