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linux ip-tables // masquerading

  I just want masquerading! Help!



   This is what most people want. If you have a dynamically allocated IP PPP dialup (if

   you don't know, you do have one), you simply want to tell your box that all packets

   coming from your internal network should be made to look like they are coming from the

   PPP dialup box.



# Load the NAT module (this pulls in all the others).

modprobe iptable_nat



# In the NAT table (-t nat), Append a rule (-A) after routing

# (POSTROUTING) for all packets going out ppp0 (-o ppp0) which says to

# MASQUERADE the connection (-j MASQUERADE).

iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE



# Turn on IP forwarding

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



   Note that you are not doing any packet filtering here: for that, see the Packet

   Filtering HOWTO: `Mixing NAT and Packet Filtering'.





#transparent proxy with squid 

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128 



#anschauen mit: iptables -L -t nat

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linux ip-tables // masquerading