wanproxy problems

[llhwjj2011]

hi
    the follows about the topological graph of wanproxy .
   Server-Frontdesk          Server-Proxy
 (192.168.0.116)             (192.168.0.42)
|                                  |
|                                  |
|                                  |
>       ------------{ Router }------------
> 
>      ... WAN (5Mbps v, 1Mbps ^ )...
>       ------------{ Router }------------
|                                  |
|                                  |
|                                  |
Client-R2D2                 Client-Proxy
(192.168.2.10)             (192.168.2.42)
when I found the topological and look up source code . I think that the wanproxy use pcap to capture packets.  but do'nt know how dose the wanproxy project  communication with the client -R2d2 and Server-Frontdesk.  Do you use the SOCKS as if proxy? 
hope you can reply my's problem. think you very much 
Regards
llhwjj2011
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