Hello everybody,
I'm trying to use a server as proxy for another website.
The given server has only one network card. So I just want it to reroute every packet he receive as a web proxy to the given server and vice-versa.
In fact, I try that because the connection between our client computers and the web server are horrfully bad but the connection between the client and the first server and between the first server and the web server are really good, so I hope that with this method I can get a better connection between client and web server.
I tried using iptables, but I get confused in setting the ip forwarding and the nat translation.
Does someone have a clue?

Thanks...

i don't understand what u mean. how exactly is your setup. is the network cable connected to a hub/switch to which other clients are also connected. If so then configure IP alias on the single network card.

# ifconfig eth0:1 <ip address> netmask <netmask> up

I'll try to explain the situation more clearly.
I want to use a server as web proxy for another web server (no cache needed), but the server with the web proxy as only one network interface.
I tried to use an alias on eth0 call eth0:1 but it doesn't work

Here come the configuration I tried on the proxy server:
eth0 192.168.1.165
eth0:1 192.168.1.166

INTIF="eth0"

EXTIF="eth0:1"

INTIP="192.168.1.165"
EXTIP="192.168.1.166"

/sbin/depmod -a
/sbin/modprobe ip_tables
/sbin/modprobe ip_conntrack
/sbin/modprobe ip_conntrack_ftp
/sbin/modprobe ip_conntrack_irc
/sbin/modprobe iptable_nat
/sbin/modprobe ip_nat_ftp
/sbin/modprobe ip_nat_irc

echo 1 > /proc/sys/net/ipv4/ip_forward
echo 1 > /proc/sys/net/ipv4/ip_dynaddr

iptables -P INPUT ACCEPT
iptables -F INPUT
iptables -P OUTPUT ACCEPT
iptables -F OUTPUT
iptables -P FORWARD DROP
iptables -F FORWARD
iptables -t nat -F

iptables -A FORWARD -i $EXTIF -o $INTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $INTIF -o $EXTIF -j ACCEPT

iptables -t nat -A POSTROUTING -s $INTIP -j SNAT --to $EXTIP

Thanks.

alaias in the form of eth0:1 don't work in iptables as far as i know and it will give error here:

iptables -A FORWARD -i $EXTIF -o $INTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $INTIF -o $EXTIF -j ACCEPT