I will be putting documentation together shortly on how to build a high-availability QoS setup using 2 spare PCs and 4 NICs. I've been very successful with this approach for a T-1 that shares both Citrix and Video Conferencing + normal web traffic and such. The real key is a combination of packet prioritization with traffic shaping. The QoS boxes I build use Fedora Core 1 and are configured as bridges. This way, you just drop them into the right spot on the network and don't have to change routes or anything. Also, I put ntop on them, so they can monitor traffic statistics to/from the WAN. They use Spanning Tree Protocol (part of the bridge-utils package) to make the solution high availability. All traffic routes through the primary QoS box, but if it fails traffic goes through the second box. I took this approach because I was using old HP Vectras (Pentium 200 Pros) that have old drives in them, which _will_ fail at some point. The Vectras were just sitting on the shelf, and I've got more customized shaping going on than any cookie cutter solution will give you. Here's a simple diagram:
-----------------
| T-1 |
-----------------
|
-----------
| switch |
-----------
| |
| |
------ ------
|QoS1| |QoS2|
------ ------
| |
| |
-----------
| switch |
-----------
|
------------
| firewall |
------------
| |
------- -------
| LAN | | DMZ |
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