HowTo Setting up redWall as a SQUID Caching Proxy

A few considerations

This How to was written for the 0.5.4d release of the redWall Firewall, allthough it should still work for future releases.
It makes relatively little sense to store all your cache in RAM because you will loose it at every boot. It would be smarter to set up a hardisk.
It is not a good idea to have a totally open proxy. Some sort of user-control should be executed.
You need any computer with 168+ MB RAM

Download redWall ISO image, burn to CD, insert into designated router and boot
During boot, system cannot find config info. Press Ctrl-C to enter setup mode
Go into setup mode, select keyboard
Set a secure root password
Yes, we would like to set up networking.
In my case, DHCP is fine. A static IP-address is highly recommended, however!
set an FQDN (hostname) for the machine.
After another OK, the system tries to identify a link on eth0. If it does not find one, press Ctrl-C and don't worry.
Quite a few services are selected from the start. Leave them as they are. Just add squid.
Boot continues, then log in with root and your password.
Go to /etc/squid/ and edit squid.conf (ViM is installed)
Add "http_access allow all" before whe first http_access line. As we said, we don't want proxy user control.
To restart squid, type "/etc/init.d/squid restart"
Squid is now set up to listen on port 3128. Configure your browser and test. "/var/log/squid/access.log" will reflect your activity.

As mentioned before, cache should be stored on HDD. To do that, add the following steps after step 14

First, check to see if there are any partitions by entering "fdisk -l"
Make sure there is no valuable data on you HDD. Delete any existing partition through "fdisk /dev/hda" -> d -> number as listed in above step.
To partition the harddisk run "fdisk /dev/hda"
Press n to add a new partition, it can be primary (press p) and should be number 1. The first partition is our swap partition. It should start at cylinder 1 and have adquate size. (enter 1 and then +256M)
The second partition can use what is left of your HDD. Press n to add another partition which will be primary as well and number 2. Accept the defaults for first and last cylinders.
press w to save the partition table
enter "mkswap /dev/hda1"
enter "mkfs -t ext3 /dev/hda2"
edit /etc/fstab by uncommenting the lines "/dev/hda1 swap..." and /dev/hda2 /var..." and commenting "tempfs /var"
edit /etc/squid/squid.conf "
- cache_dir ufs /var/spool/squid MB 16 256" where MB reflects the size of the cache.
- Default is 100 Mbytes but that seems small. Max is the size of the partition -20%!

(Boot Config Media + Configuration Media)

Insert a floppy
Type "fdformat /dev/floppy/0" to format it and "mkfs /dev/floppy/0" to create the filesystem
Type "save-config mkboot" to create a boot config media
Type "save-config" to save the configuration to the just-created boot config media
Type "shutdown now -r" or "reboot" and test again to see if everything is fine.

Edit /etc/redwall/save-config.conf
- change "boot_config_device=..." to "boot_config_device=/dev/discs/disc0/part2"
- change "floppy_save=1" to "floppy_save=0"
- change "harddisk_save=0" to "harddisk_save=1"
Type "save-config mkboot" to update the boot config media with the new settings in save-config.conf
Type "save-config" to save the configuration