What to do i same network address layout is used?!

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cybermailer
OpenVpn Newbie
Posts: 13
Joined: Sat Jul 08, 2017 8:31 pm

What to do i same network address layout is used?!

Post by cybermailer » Fri Jan 24, 2020 12:34 pm

Hi,
i have several network's i.e.
192.168.x.x
40.x.x.x
10.4.x.x

my vpn server assign 10.8.x.x address to clients.
So now i want to use vpn on a 10.4.x.x but this won't work. Is it because it is not allowed to use a 10.x.x.x network?

What can be the simplest way to handle this problem? I can not change the 10.4. address (=no solution).

thx!

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Pippin
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Location: irc://irc.libera.chat:6697/openvpn

Re: What to do i same network address layout is used?!

Post by Pippin » Fri Jan 24, 2020 7:19 pm

I gloomily came to the ironic conclusion that if you take a highly intelligent person and give them the best possible, elite education, then you will most likely wind up with an academic who is completely impervious to reality.
Halton Arp

cybermailer
OpenVpn Newbie
Posts: 13
Joined: Sat Jul 08, 2017 8:31 pm

Re: What to do i same network address layout is used?!

Post by cybermailer » Mon Jan 27, 2020 7:46 am

I've red this:
https://openvpn.net/community-resources ... e-subnets/

That means a subnet with 10.8.X.X should not conflict with 10.4.X.X -> OR?

Therefore maybe i have to search if there is a firewall blocking me...

TiTex
OpenVPN Super User
Posts: 310
Joined: Tue Apr 12, 2011 6:22 am

Re: What to do i same network address layout is used?!

Post by TiTex » Mon Jan 27, 2020 9:07 am

The subnet is determined by the subnet mask , but if your subnet mask is not lower than or equal to 12 bits (ie. 255.240.0.0) you're ok ... it's not conflicting

Beside that , should we just guess what your configs look like and answer to your questions based on that ?
If that's the case, you're on your own :)

Pippin pointed out that topic url for a reason

cybermailer
OpenVpn Newbie
Posts: 13
Joined: Sat Jul 08, 2017 8:31 pm

Re: What to do i same network address layout is used?!

Post by cybermailer » Mon Jan 27, 2020 1:06 pm

Oh thx guys. Now i know what's going on. For some reason the client do not uses my dns. It uses the ip from me and my gateway but not my dns...
therefore there was a resolv problem. For shortly fix i added 8.8.8.8 to /etc/resolv.conf and set this file write protected.

Now i have to look whats the problem why my dns is not pushed.

My Server file:

Code: Select all

client-to-client
ca /etc/openvpn/ca.crt
cert /etc/openvpn/vpn-server.crt
dev tun
dh /etc/openvpn/dh2048.pem
keepalive 10 120
key /etc/openvpn/vpn-server.key
port 1194
proto udp
server 10.8.0.0 255.255.255.0
verb 3
push redirect-gateway def1
push dhcp-option DNS 192.168.1.1
push route 192.168.1.0 255.255.255.0
my client looks like:

Code: Select all

dev tun
proto udp

log openvpn.log
verb 3

ca ca.crt
cert client_XXX.crt
key client_XXX.key

client
remote-cert-tls server
remote dyndns.XXXX.at 1194

script-security 2
up /etc/openvpn/update-resolv.conf
down /etc/openvpn/update-resolv.conf
Did i made something wrong hiere?

TiTex
OpenVPN Super User
Posts: 310
Joined: Tue Apr 12, 2011 6:22 am

Re: What to do i same network address layout is used?!

Post by TiTex » Mon Jan 27, 2020 6:22 pm

what linux distribution are you using on your client?

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