How to use my DNS server instead of public IPs?

How to customize and extend your OpenVPN installation.
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omidb
OpenVpn Newbie
Posts: 2
Joined: Tue Oct 04, 2011 11:49 pm

How to use my DNS server instead of public IPs?

Post by omidb » Wed Oct 05, 2011 12:05 am

Hello,

I have written a script based to automate OpenVPN installation process on Ubuntu servers. You can download it here:

http://www.mediafire.com/?pom582421i4iiy6

The script uses Port 80 and works perfectly well for ISPs outside Iran. However, to be able to use the server for clients inside Iran, I need to use my server's DNS server instead of public DNS servers. The reason is that (at least) in Iran ISPs seem to have blocked public DNS IPs, so that if one use any of the public DNS IPs (Like Google etc.), one can connect to OpenVPN server but can not visit any website.

To overcome this obstacle, I am trying to make set OpenVPN to use the very server's DNS server. In order to do so, I have set up unbound DNS server on my OpenVPn server, following this tutorial:

https://calomel.org/unbound_dns.html

My original openvpn.conf is like this:

Code: Select all

    dev tun
    proto tcp

	# Notice: here we set the listening port to be 80
    port 80

    ca /etc/openvpn/easy-rsa/2.0/keys/ca.crt
    cert /etc/openvpn/easy-rsa/2.0/keys/server.crt
    key /etc/openvpn/easy-rsa/2.0/keys/server.key
    dh /etc/openvpn/easy-rsa/2.0/keys/dh1024.pem

    user nobody
    group nogroup
    server 10.8.0.0 255.255.255.0

    persist-key
    persist-tun

    #status openvpn-status.log
    #verb 3
    client-to-client

    push "redirect-gateway def1"
    push "dhcp-option DNS 208.67.222.222"
    push "dhcp-option DNS 208.67.222.220"

    comp-lzo

Now to make OpenVPN useful for users inside Iran, the problem is that how should I modify the openvpn.conf to be able to push my own DNS server, which is defined as:

server:
interface: 0.0.0.0
access-control: 10.0.0.0/16 allow
verbosity: 1


I have made some trial and error changes to

push "dhcp-option DNS 208.67.222.222"
push "dhcp-option DNS 208.67.222.220"
(like using ' 10.0.0.0' or the server's IP address instead of the common public DNS IPs) in push dhcp-option but none of them worked in tests (outside Iran) and I've ran out of ideas.

So I really appreciate your hints to solve this crucial problem.

User avatar
krzee
Forum Team
Posts: 729
Joined: Fri Aug 29, 2008 5:42 pm

Re: How to use my DNS server instead of public IPs?

Post by krzee » Wed Oct 05, 2011 12:33 am

in unix you need the update-resolv-conf script to accomplish this
hope that helps

omidb
OpenVpn Newbie
Posts: 2
Joined: Tue Oct 04, 2011 11:49 pm

Re: How to use my DNS server instead of public IPs?

Post by omidb » Wed Oct 05, 2011 12:57 am

Well, I have already update /etc/resolv.conf to
nameserver 1.2.3.4
where 1.2.3.4 is my server's IP.

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