Here we go loop de loo here we go loop de lai...

This text assumes that you have:

 * A working NoCatAuth gateway
 * A working NoCatAuth AuthServer
 * A DebianLinux box running the NoCat Gateway
 * Enough patience to slog through this

IMQ was the solution:  http://trash.net/~kaber/imq/ (OLD URL: http://luxik.cdi.cz/~patrick/imq/index.html)

First, get the 2.4.20 linux kernel (assuming Debian here folks! May need the unstable apt-site in your {{{/etc/apt/sources.list}}}):

 1. {{{# apt-get update}}}
 * {{{# apt-get install gcc libcurses5 libcurses5-dev kernel-package kernel-headers-2.4.20 kernel-source-2.4.20}}}
 * {{{# cd /usr/src}}}
 * {{{# bunzip2 kernel-source-2.4.20.tar.bz2}}}
 * {{{# tar xvvf kernel-source-2.4.20.tar}}}

To install the IMQ Patch (from the FAQ):

Get the combo patch [[attachment:imq-2.4.18-combo-patch.txt]] and the precompiled shared libs [[attachment:libipt_IMQ-1.2.6a.tar.gz]] matching your iptables version (iptables -V - was 1.2.6a for me).

Put the patch file in /usr/src

 1. {{{# cd /usr/src/linux}}}
 * {{{# patch -p1 <../imq-2.4.18.diff-combo-6}}}
  * (make sure it's the right name you saved from above)
  * find where iptables keeps its shared libraries (/lib/iptables and /usr/lib/iptables is common)
 * {{{# tar xvzf libipt_IMQ-1.2.6a.tar.gz -C /lib/iptables}}}

Then you need to make and install your kernel.  Here's my .config [[attachment:config-2.4.20-imq]] file that I used to compile my kernel.  It's a pretty stock 2.4.20 kernel, patched with the IMQ patch.

 1. {{{# cd /usr/src/linux}}}
 * {{{# make menuconfig}}}

You will have three new options:

 Networking options:: IP: Netfilter Configuration --->IMQ target support
 Networking options:: IPv6: Netfilter Configuration --->IMQ target support
 Network device support:: IMQ (intermediate queueing device) support

Choose at least one of the targets and the device itself. Netfilter debugging should be turned off, otherwise cou get lots of annoying messages.

 1. {{{# make dep modules bzImage modules_install}}}
 
or, for DebianLinux, I use [[http://www.thing.dyndns.org/debian/kerneldeb.htm|Thing's Kernel Recompile Page]]:

 1. {{{# make dep}}}
 * {{{# make-kpkg clean}}}
 * {{{# make-kpkg --revision=thing.2.0 kernel_image}}}
 * {{{# type dpkg -i name_of_the_kernel.deb}}}

May give you a warning to move your libraries if you're on the same kernel level. If so do this and then retry installing the kernel package.

 * {{{# mv /lib/modules/2.4.20 /lib/modules/2.4.20-old}}}

Next, replace the [[attachment:throttle.fw]] [[attachment:initialize.fw]] and [[attachment:access.fw]] scripts, typically located in /usr/local/nocat/bin

Here's some test results I have: <<BR>>

Thinkpad logged in as Public, Mac logged in as Public <<BR>>
Download 200 KB file at same time: 89 kb/s each <<BR>>
Download 200 KB file solo: 167 kb/s each (fluctuates up to 263 kb/s for solo - but this is a live node) <<BR>>
 
Thinkpad logged in as Public, Mac logged in as Member <<BR>>Download 500 KB file on Mac, 200 KB file on ThinkPad: 500 kb/sec Mac, 250 kb/sec ThinkPad <<BR>>
 
ThinkPad logged in as Public, Mac logged in as Owner <<BR>>
Download 2 MB file on Mac, 200 KB file on ThinkPad: 1000 kb/sec Mac, 250 kb/sec Thinkpad <<BR>>
 
Looks pretty fair to me - the 2 publics aren't stomping over each other (1 drowning out the other).

There's a lot of stuff in the scripts that I need to take OUT, but it's working right now, and I'll deal with that Jingo problem later.  Next, is to make a nice PHP frontend to the user admin page.

-- DanRichardson
----
Great stuff Dan, thanks!  I'm really curious about the "fairness" of it.  When you have a chance could you setup two clients and ping flood from one (to something on the local network but on the other side of the nocat gateway) and then try and authenticate from the other client)?-- AdamShand
----
You must have been editing when I posted my initial tests.  Not sure which direction you want those tests run.  Be more specific, or come down and try it yourself.  :-).  Oh yeah, feel free to pretty it up all you want.  I'm WikiRusty.  --DanRichardson
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