Re: iptables port forwarding to tun0 device

[Jorge Davila <davila@nicaraguaopensource.com>]

Yaniv:

Since the tun device is created you can reference them as another network 
interface and configure the iptables rules as normal.

Hope this help,

Jorge Davila.
On Wed, 6 Jun 2007 16:45:24 +0300
  Yaniv Fine <yfine@jacada.com> wrote:
> 
> Hi experts
> 
> i have the following configuration
> eth0.10.90.20.3/24
> tun0=172.16.10.x/24
> 
> eth0 configure as Wan interface
> eth1/tun0 are lan interface .
> tun0 network 172.16.10.200 =>  web server
> in side my tun0 there is a web server i need to manage for the outside
> world (eth0, it can also be restricted to specific ip address )
> i am trying to find a way using port forwarding to enable this .
> can some one please help me modify my correct iptables rules
> 
> 
> 
> 
> IPTABLES="/sbin/iptables"
> EXTIF="eth0"
> INTIF="eth1"
> 
> #Flush all rules
> $IPTABLES -F
> $IPTABLES -F -t nat
> $IPTABLES -F -t mangle
> 
> #Set default behaviour
> $IPTABLES -P INPUT DROP
> $IPTABLES -P FORWARD ACCEPT
> $IPTABLES -P OUTPUT ACCEPT
> 
> #Allow related and established on all interfaces (input)
> $IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
> 
> #Allow releated, established and ssh on $EXTIF. Reject everything else.
> $IPTABLES -A INPUT -i $EXTIF -p tcp -m tcp --dport 22 --syn -j ACCEPT
> #$IPTABLES -A INPUT -i $EXTIF -p tcp -m tcp --dport 80 --syn -j ACCEPT
> $IPTABLES -A INPUT -i $EXTIF -j REJECT
> 
> #Allow related and established from $INTIF. Drop everything else.
> $IPTABLES -A INPUT -i $INTIF -j DROP
> 
> #Allow http and https on other interfaces (input).
> #This is only needed if authentication server is on same server as chilli
> $IPTABLES -A INPUT -p tcp -m tcp --dport 80 --syn -j ACCEPT
> $IPTABLES -A INPUT -p tcp -m tcp --dport 443 --syn -j ACCEPT
> 
> #Allow 3990 on other interfaces (input).
> $IPTABLES -A INPUT -p tcp -m tcp --dport 3990 --syn -j ACCEPT
> 
> #Allow ICMP echo on other interfaces (input).
> $IPTABLES -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
> 
> #Allow everything on loopback interface.
> $IPTABLES -A INPUT -i lo -j ACCEPT
> 
> # Drop everything to and from $INTIF (forward)
> # This means that access points can only be managed from ChilliSpot
> $IPTABLES -A FORWARD -i $INTIF -j DROP
> $IPTABLES -A FORWARD -o $INTIF -j DROP
> 
> #Enable NAT on output device
> $IPTABLES -t nat -A POSTROUTING -o $EXTIF -j MASQUERADE
> 
> 
> thank you !
> 
> 
> 

Jorge Isaac Davila Lopez
Nicaragua Open Source
+505 430 5462
davila@nicaraguaopensource.com