Russ and others,
Most of the Configuration settings are explaned (although not to well) in the Readme file that comes with the PProxy.
In Linux, it should be in the Docs folder where you put the PProxy after un-tarballing it.
I don't have one running on a Linux box at the moment, I use the same W2K box as my Networking Router, for Dnet Proxy & my little HTML generating Stats Page.
I can give you a run down on all that you'll need, just look at the PProxy.ini below.
All that you'll need to change will be highlited in
Bold
=====================================
; $Id: proxyper.ini,v 1.20 2000/01/23 15:49:16 jlawson Exp $
[KeyServer]
ipaddress=us.v27.distributed.net
port=2064
connectperiod=600
connectivity=normal ; normal,offline,lurk,lurkonly
;bindip= ; IP to talk out to keyserver from
;uuehttpmode=0
; 0=normal,1=uue,2=http,3=http+uue
; 4=socks4,5=socks5,6=genproxy,7=genproxy+uue
;httpproxy=wwwproxy.corporation.com
;httpport=8080
;httpid=
[ports]
;listenaddress= ; IP to accept clients on
port=2064
;port2=23 ; must be root for ports < 1000
;port3=80
testport=3064
timeout=30
[console]
logfileconsole=
Whatever you want your main .log named
logfileconsolerotation=daily
or weekly,yearly
consoleverbosity="general stats keyblock server client buffers timestamp attention errlow errsevere"
timestampflags=129 ; 129=utc-2, 1=lt-2, 130=utc-4, 2=lt-4
[rc564]
logfilekeyblock==
Whatever you want your stats .log named
logfilekeyblockrotation=daily]
or weekly,yearly
minkeysready=5000
as big as your herd is, I'd go at least 10,000
maxkeysready=5001
10,001 
maxkeysdone=2000
[desII]
Who Cares, as long as it says contestclosed=1 at the end
logfilekeyblock=pproxydes
logfilekeyblockrotation=daily
minkeysready=10
maxkeysready=20
maxkeysdone=3
contestclosed=1
[ogr]
Who Cares, as long as it says contestclosed=1 at the end
logfilekeyblock=pproxyogr
logfilekeyblockrotation=daily
minkeysready=10
maxkeysready=20
maxkeysdone=3
contestclosed=1
[csc]
Who Cares, as long as it says contestclosed=1 at the end
logfilekeyblock=pproxycsc
logfilekeyblockrotation=daily
minkeysready=10
maxkeysready=20
maxkeysdone=3
contestclosed=1
[misc]
proxymessage="Kilowatt's Stats Proxy!"
Your own clever saying here, between the ""s
pidfile=rc5desproxy.pid
statusperiod=3600
this is a 1 hour period, to cut down on file size
;logfilecompressor=logcompressor.sh
[ignoredip]
[allowedip]
==============================
EDIT- You don't need to set the IP in the PProxy, just aim all the clients to the Linux box's IP, and it should work.
When setting the inbuffer, figure about 1 block per CPU Mhz per day.
Then multiply it by at least 3 day worth, incase something happens you can't get online, or dnet goes down for a few days.
I flush anywhere from 5-7000+ a day, an have mine set to 20,000 in, and flush every 2500.
Does that help?