[LARTC] 2 lans + internet + squid

[Jose Luis Ocaranza]

Hie,

I=B4m working on this server :
-2 lans network (eth0-172.17.1.0 and eth1-172.16.1.0)
-1 ADSL internet conection trought eth2-ppp0
-CBQ.Init script.
-Squid cache server.
I have some clases for users with diferent bandwith (64K, 128K, 256K).
Few days ago I realized that the bandwith limitation afects the downloads 
speed not only from the internet, but also from the server itself. Let see=
.. if i 
set an FTP conection to my server from a client machine, the download is 
shaped to the bandwith assigned to the user.
What i need is to let the user download at full speed if the data comes fr=
om 
the server, but if it comes from the internet shapeit down. This is specia=
lly 
usefull for the squid service, so if the website is in the squid cache, th=
e user 
download is at full speed, but if it=B4s not the user download is shaped.
Any idea what can I touch ??
I try aplying filter based on dst or src IP (server=B4s IP) and ports (squ=
id port), 
with no result.
It could be posible marking packets with iptables that comes from the ppp0=
 
interface ?
Any sample configs !!

Thx in advance,

Jose Luis Ocaranza
Santiago del Estero
Argentina