If itsis psoosible? Forward to squid proxy

[niekshas]

Hello
First i want say sorry for bad english
Here mine situation

I work in huge gonoverment netowk. Mine network uses proxy to acces internet. Shame that proxy not transparent... so i must every time tipe setting in every PC. Thats anoying. SO i want to change situation.

I made a bit stupid gateway PC (debian). With single network adapter. Mess a bit with IP tables. And simple gateway working.
network Cnfig:

auto lo
iface lo inet loopback

# The primary network interface
auto eth0
allow-hotplug eth0
#iface eth0 inet dhcp
iface eth0 inet static
	address 10.0.8.226
	netmask 255.255.255.0
	gateway 10.0.8.1

iptables Config:

###Flush iptables configurations
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

###Enable IP forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward

###Enable ip masquerading
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

And all seemes working.. i can browse sies (with proxie esttings).

So now i want with that Gateway make proxie transparent. So i'm tryeing to forward 80 port to proxie.
Config:

###Flush iptables configurations
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

###Enable IP forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward

###Enable ip masquerading
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

###bandau forwardint 80 porta
iptables -A FORWARD -j ACCEPT
iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-destination 212.59.6.119:80

Well it seems forwarding working... but i try to get page (for example w w w . linuxforums . org)... i get from proxy error

ERROR
The requested URL could not be retrieved
--------------------------------------------------------------------------------
While trying to retrieve the U R L: / 

The following error was encountered: 

•Invalid URL 
Some aspect of the requested URL is incorrect. Possible problems: 

•Missing or incorrect access protocol (should be `h t t p : / /'' or similar) 
•Missing hostname 
•Illegal double-escape in the U R L-Path 
•Illegal character in hostname; underscores are not allowed 
--------------------------------------------------------------------------------
Generated Thu, 11 Nov 2010 11:02:48 GMT by ... (squid/3.0.STABLE25)

But if i put proxie setting in browser (212.59.6.119:80) all again works fine.

So i want to advice what i'm doing wrong..

P.s. Auto proxie seetings not possible. And i hawe a lot of notebooks.. so they every time need to change setting.. and thats bad

PLZ help