openvpn/dns issues on ubuntu 14.04

Tue Apr 7 14:56:34 UTC 2015

lubuntu use lxde and network manager
2 clients with ubuntu use unity as DE

about your questions:

- all clients does the openvpn connection via cli (command line)
- the connection from client to server works properly

when I do the ifconfig on all clients, I have:

loopback and eth0 egual (change only the ip address)
tun0 is a bit different (also here change the ip address)

tun0      Link encap:UNSPEC  HWaddr00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:192.168.40.130  P-t-P:192.168.40.129 Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1378 Metric:1
          RX packets:157 errors:0 dropped:0  overruns:0 frame:0
          TX packets:188 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:72840 (72.8 KB) TX bytes:41759 (41.7 KB)

tun0      Link encap:UNSPEC  HWaddr00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:10.8.0.14  P-t-P:10.8.0.13 Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1378 Metric:1
          RX packets:225 errors:0 dropped:0 overruns:0 frame:0
          TX packets:257 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100                                          
          RX bytes:92662 (92.6 KB) TX bytes:49045 (49.0 KB)

On my client (it works) I tried both ip addresses and it works properly

On Tue, 07 Apr 2015, Henk te Sligte wrote:

> So the difference is only lubuntu or ubuntu? I'm not sure if lubuntu has
> Network Manager, how do you connect with the clients? Do you use Network
> Manager or the console application? Do you see the clients making the
> openvpn connection on the server? Just to make sure, can you do ifconfig on
> all clients?
> 
> 
> On Tue, Apr 7, 2015 at 3:50 PM, Paolo De Michele <paolo at paolodemichele.it>
> wrote:
> 
> >
> > thanks for your reply
> > I do not think it is a server problem because a client is working properly
> > if you see the previous email dig works fine but when I request that web
> > page from a browser can not display the page
> >
> > I have this problem only with two clients that use ubuntu.
> > the client with lubuntu works properly.
> >
> > can I verify anything else?
> > thanks in advance
> >
> > regards
> >
> > On Tue, 07 Apr 2015, Henk te Sligte wrote:
> >
> > > Just yesterday I configured a debian openvpn server and ubuntu clients.
> > On
> > > the server, you need to have IP forwarding enabled, and iptables should
> > > forward all traffic.
> > >
> > > First, enable IP forwarding:
> > > sudo sysctl -w net.ipv4.ip_forward=1
> > > sudo /etc/init.d/procps restart
> > >
> > > Then, let iptables forward all traffic:
> > > iptables -t nat -I POSTROUTING -o eth0 -j MASQUERADE
> > > iptables -A FORWARD -i tun0 -o tun0 -j ACCEPT # vpn to vpn
> > > iptables -A FORWARD -i tun0 -o eth0 -j ACCEPT # vpn to ethernet
> > > iptables -A FORWARD -i eth0 -o tun0 -j ACCEPT # ethernet to vpn
> > >
> > > Note that this doesn't filter any traffic, it just makes sure that you
> > can
> > > communicate with the ethernet. If you want to block certain traffic and
> > > allow other traffic, I suggest to read some more about iptables.
> > >
> > >
> > >
> > > On Tue, Apr 7, 2015 at 11:14 AM, Paolo De Michele <
> > paolo at paolodemichele.it>
> > > wrote:
> > >
> > > > anyone can help me?
> > > > thanks in advance
> > > >
> > > > regards
> > > >
> > > > On 3 April 2015 at 12:25, Paolo De Michele <paolo at paolodemichele.it>
> > > > wrote:
> > > >
> > > >> hi there,
> > > >>
> > > >> this is my scenario:
> > > >>
> > > >> - 1 server (I installed openvpn and bind via docker in 2 different
> > > >> instances)
> > > >> - 3 clients (first one with lubuntu 14.04 x64 and the last two clients
> > > >> with ubuntu 14.04 x64)
> > > >>
> > > >> the vpn server works correctly
> > > >> if I connect to the server with vpn client installed lubuntu I have no
> > > >> problem.
> > > >> if I try ubuntu by clients, same problems.
> > > >>
> > > >> let me explain:
> > > >>
> > > >> the connection to the vpn server works correctly
> > > >> I have an additional interface called tun0 with a regular ip address
> > > >> I have also the new dns servers: the first one private (my dns server)
> > > >> and the other two (publics)
> > > >>
> > > >> if I try to solve an hostname by dig command, works perfectly
> > > >> if I try to view the same hostname via browser I cannot be able to
> > > >> visualize the webpage
> > > >> If I try the ip address, works perfectly
> > > >>
> > > >> can I do other tests?
> > > >> anyone can help me please?
> > > >>
> > > >> thanks in advance
> > > >> regards
> > > >>
> > > >
> > > >
> > > > --
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> > > >
> > > >
> >
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> >

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-- 
Paolo De Michele
Finger Print: 038F 13HS 9339