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I have a hosted linux server with public IP address. I would like to configure it as a VPN server. Then I would like to hide all of its services behind this VPN, so that if I open a socket then by default it is accessible through VPN and not accessible via Internet.

Is it possible?

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3 Answers 3

up vote 1 down vote accepted

Iptables is helpfull !

for example, with an openvpn run on eth0 interface, with 1194 tcp port and your vpn interface is "tun0"

#Flush you input tables
iptables -F INPUT

#Allow connection to openvpn
iptables -i eth0 -p tcp --dport 1194 -j ACCEPT

#Allow connction through you vpn interface

iptables -i tun0 -j ACCEPT

# set you default INPUT policy to DROP
iptables -P INPUT DROP

So, you can set your filter (rules 3) with you vpn adresses, or an other vpn interface (ipsec0, gre, tap etc..)

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Thank you - I will test it in a few days –  agsamek Aug 26 '09 at 8:01

Attach the services to the interface/ip of the VPN. To make ssh only listen to the VPN-ip change the "sshd_config":

#Listen 0.0.0.0
Listen 10.62.63.1

Same with apache and so on..

You could also firewall the public ip and only allow on the VPN.

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Thank you for your answer. I wouldn't like to modify all services, since they are started by different people. Could you write an example of how can I firewall the public IP while allowing all ports on VPN? –  agsamek Aug 25 '09 at 14:23
    
gayell's iptables "stub" looks good enough.. :) –  rkthkr Aug 25 '09 at 14:36

Of course, just set up iptables rules appropriately.

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