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Old 03-12-2009, 02:15 AM   #1
mjhvg
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Registered: Mar 2009
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Proxy and Client talk, proxy isn't returning/retrieving requests (iptables problem?)


Hi All,

I am trying to use NSTX in the style of thomer.com/howtos/nstx.html

The client is 172.16.16.2 for the tun device, and the wireless card is using a static IP of 192.168.1.111
The proxy is 172.16.16.1 for the tun device and with fixed external IP of 123.123.123.123.
I have the following entered in the proxy for ip forwarding and ip tables

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -s 172.16.16.0/24 -j MASQUERADE
iptables -A INPUT -p udp --dport 53 -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state NEW -i ! eth0 -j ACCEPT

From the tcpdump tool I can see that the proxy is receiving requests for web pages and the like. It is not, however, returning the encapsulated pages as it should. It looks to me like a problem with ip tables.

Can someone shed some light?

Thanks
 
  


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forwarding, iptables, masquerading, proxy, ubuntu


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