[Asterisk-Users] QOS Device?

[rsenykoff at harrislogic.com]

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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