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Materhorn Ethernet to Ethernet Firewall with dhclient support
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Written by: Charles Steinkuehler
Last Revised: 1/27/00
Disclaimer:
This is the procedure I used to get my Materhorn based LRP setup
running.  Your results may vary.  Please note that I have made
absolutely no changes to the default Materhorn IPCHAINS script.  You
should examine the firewall setup to determine if it is appropriate
and safe in your environment.
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Usefull LRP related links:
http://www.linuxrouter.org/
http://www.linuxrouter.sourceforge.net/
http://lrp.ramhb.co.nz/main.htm
http://www.c0wz.com/
http://beta-linuxrouter.razorsedge.com/
http://lrp.plain.co.nz/
http://wpkgate.kc.com.my.cpwright.com/lrp/
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You might also want to read up on basic linux networking, including
IP masquarading and IPCHAINS.  There are many FAQs and HOWTOs
available online.  Remember, LRP is 'real' linux, so most mainstream
linux documentation applies directly to your LRP box.  Note that
Materhorn runs kernel 2.2.13, and uses the newer commands (ipchains
and ip instead of ipfwdadm and ifconfig) when you are looking up
documentation.
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Things to add:
DHCP client for those without a static IP internet connection
  - Included in this version
DHCP server to autoconfigure client machines
  - If you need this, get my dhcpd.lrp for Materhorn.  You will need
  a larger boot device, or two floppy disk support
Caching nameserver
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Setup instructions for Materhorn LRP ethernet-ethernet firewall disk

1) Create a floppy using rawrite (DOS) or dd (linux) and the image
you downloaded (1440-eth-eth-dhclient.floppy)

2) Boot the disk on your LRP machine

3) Log in as root

4) You should see a configuration screen.  If not, type lrcfg

5) Select menu item 3, then 2, then 1, to edit /etc/modules

6) Uncomment the module(s) needed for your ethernet card(s).  All
modules listed in the file are already on your LRP disk.  If you are
using ne.o, ne2k-pci.o, or e2100.o, you will also need to uncomment
8390.o

NOTE: If the modules you need are not listed, you will have to add
them to your LRP disk.  See below.

7) Save the file <alt>-w and exit <alt>-q

8) Return to the main lrcfg menu

9) IMPORTANT: BACKUP YOUR CHANGES OR THEY WILL BE LOST!

10) Select LRP menu item b, then 5 to backup changes to modules  
  
11) Reboot

12) Configure your client machines:
  IP=192.168.1.xxx (don't use 0, 254, or 255!)
  Subnet Mask=255.255.255.0
  Default Gateway=192.168.1.254
  Primary DNS=your.primary.dns.server
  Secondary DNS=your.secondary.dns.server

13) You should have a fully functional masquarading firewall


OPTIONAL:

You might want to set your root password (type passwd at a command
propmt).  Remeber to backup /etc to your disk or there will be no
password the next time you boot.


ADDING MODULES TO YOUR LRP DISK

1) Get the Materhorn LRP kernel tarball (2.2.13-2.tar.gz)

2) Extract the module(s) you need using winzip.  IMPORTANT: Check the
modules.dep file to see if there are any dependancies for the module
you want.  You will need to add these modules as well.

3) Copy the module(s) to a dos floppy

4) Insert the dos floppy into your LRP machine

5) Get to a command prompt on the LRP machine (login as root, if
necessary, and quit from the lrcfg main menu)

6) Mount the dos floppy
  mount -t msdos /dev/fd0 /mnt

7) Copy the module(s) to /lib/modules
  cp /mnt/<filename>.o /lib/modules

8) Unmount the dos floppy
  umount /mnt

9) Modify /etc/modules to load your module.  You can use ae from the
command line, or lrcfg

10) ADVANCED: You might want to delete some of the unused network
modules to save disk space.  Any of the modules commented out in
/etc/modules are safe to delete.

11) IMPORTANT: BACKUP YOUR CHANGES OR THEY WILL BE LOST!

12) Select LRP menu item b, then 5 to backup changes to modules