could not determine ipv4 ipv6 protocol

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I am having issues connecting to my VPN, with port forwarding set correctly as I can VPN into my other lubuntu machine, also UFW is disabled. Can someone please guide my as to what I am missing in my config?? Also additionally when i turn on my UFW i can ping WAN or websites by names like google.com, but cannot ping workgroup computers by name but only when i add «.local» suffix with computer names i can ping in LAN.

I hope the above question is not connected to my openVPN configuration. As this is networking issue i felt to add the UFW issue too. Below is my detailed config :

Hi there here is my openvpn.log file :

my server.conf file :

Heres my ifconfig :

Heres my client log :

2 Answers 2

This message is printed when no IPv4/v6 preference is given in the config (i.e. proto udp/tcp is used) and OpenVPN is running as a server. Just change in server.conf on what you need udp4/upd6:

Updated: For tcp protocol (not udp) just change in server.conf on what you need tcp4/tcp6:

Some of your problem could be the fact of somebody trying to D dos your server at least that what happen to my server everything was going well and when I set up OpenVpn it worked flawless no issue when I got hit and happen to reinstall the Os and reinstall Openvpn the error had occurred. This may or may not be your problem and I do hope this method will help.

First off — Troubleshoot the problem.

The ifconfig means that you do not have the required package install so when you go and type in ifconfig it will not display interface configuration to fix that you will need to install net-tools

yum install net-tools

Now the could not determine IPv4/IPv6 You may not have to disable IPv6 you can if you wish to do so but I Don’t believe it will fix your problem however if it does Congrats.

The next thing you should do is edit your iptables to allow openvpn your firewall could be blocking the configuration required to run openvpn.

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konstantinj commented Sep 20, 2017

Hi,
I was successfully using version 2.3. After upgrading to 2.4 it didn’t work anymore since IPv6 seems to be the default and I needed to disable IPv6 on my machine because of a bug in docker where I could not get real client IPs inside containers.

Can I turn off IPv6 somehow?

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buchdag commented Sep 20, 2017

You’ll have to run ovpn_genconfig again with -u udp://YOURVPNSERVER.TLD or -u tcp://YOURVPNSERVER.TLD instead of udp6 or tcp6 to disable IPv6.

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konstantinj commented Sep 20, 2017

Mh, I did run only ovpn_genconfig -u udp:// .

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konstantinj commented Sep 20, 2017

As I see it in https://github.com/kylemanna/docker-openvpn/blob/master/bin/ovpn_run there is no way of skipping it.

That’s my debug output:

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buchdag commented Sep 20, 2017 •

Is your OpenVPN server running on Ubuntu ?

You’ll probably have to edit your client configs, locate this line:

remote yourvpnserver.tld 1194 udp

and replace udp with udp4 to force connection over IPv4 with a 2.4 client

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konstantinj commented Sep 20, 2017

Ok. But I cannot even start the server.

I’ve disabled IPv6 on the host machine completely. But yes the host is Ubuntu 17.04.

The server exists on start. I guess because of this:

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konstantinj commented Sep 20, 2017

Ah, I needed to replace it in the openvpn.conf
proto udp to proto udp4
Thought since in the container it’s NOT ubuntu it doesn’t matter.

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buchdag commented Sep 20, 2017

That might be a stupid question, but if you disabled IPv6 on your host entirely, did you also remove the AAAA record on (sub)domains pointing to it ?

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buchdag commented Sep 20, 2017

So in 2.4 proto udp is actually dual stack ?

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konstantinj commented Sep 20, 2017

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konstantinj commented Sep 20, 2017

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buchdag commented Sep 20, 2017

Make sense, if udp is dual stack for the client, should be the same for the server.