Openvpn dns lookup failed
How to fix dns lookup failed error in windows 10/8/7
us=993113 Thu Dec 4 15:16:36 2014 ‘V4,dev-type tun,link-mtu 1560,tun-mtu 1500,proto TCPv4 SERVER,comp-lzo,cipher AES-128-CBC,auth SHA1,keysize 128,key-method 2,tls-server’ is the expected remote options string.
us=52032 Thu Dec 4 15:16:44 2014 PRESSURE: PUSH REPLY,redirect-gateway def1,dhcp-option DNS 22.214.171.124,dhcp-option DNS 126.96.36.199.188.8.131.52.184.108.40.206.220.127.116.11.18.104.22.168.22.214.171.124.126.96.36.199. ping 15,ping-restart 120,ifconfig 188.8.131.52,route 10.13.0.1,topology net30,ping 15,ping-restart 120 10.13.0.94 is an IP address. ‘10.13.0.93’ is the IP address of the server.
Ubuntu does some strange things with DNS, but OpenVPN has a solution for that. If you installed openvpn from the Ubuntu repositories, you’ll find a script called update-resolv-conf in /etc/openvpn/update-resolv-conf that tells Ubuntu which DNS to use for your vpn link. Add the following lines to your openvpn configuration file to allow it:
Modern Ubuntu (at least 18.04 and newer) implemented some extra systemd DNS magic, as @Thenightmanager points out in the comments, and the update-resolv-conf script which no longer suffice. For a potential working solution, look into update-systemd-resolved.
How to fix “the dns server isn’t responding” error in
I’ve set up OpenVPN and everything seems to be working well. I’ve pushed all traffic into the VPN tube, and I’m having trouble browsing the internet and accessing anything on the green interface except the GW’s IP address.
I’m still new to Shorewall and can’t seem to find any logs to search for any blocked ports from the dashboard. Is there something else that needs to be configured? I guess I’ll have to use iptables to grep for ports, but I’d like to see if someone has a fast fix for this.
Thank you for your assistance. Since the DNS server is not resolving IP addresses over the VPN network, no traffic is passing through the firewall. The GW is openvpn’s default DNS server, and it responds to ping but not DNS. Is there a DNS environment that I should know about?
The same thing happened to me lately, but I couldn’t figure out why. I looked for logs but couldn’t find any, so I used tcpdump to sniff traffic and discovered an imcp destination that was unreachable on port 53/udp. I believe dnsmasq is dropping requests.
Providing local dns with pfsense
DNS lookups are evidently failing, as shown by research.
How to set up a dns server on a synology nas
If DNS is configured correctly on the server and its name servers, it shouldn’t matter what client computer is used for DNS lookups. If DNS lookups fail on some client devices but not others, I’d presume that the client devices have configuration issues. If all DNS lookups fail, DNS for the server or the server’s name servers, if they are not the same, is not configured correctly.
We’re just testing with iOS devices as clients right now, and DNS lookups are handled by the VPN server. The DNS server is separate from the VPN server. With no difference in performance, we tried putting a) nothing, b) the internal DNS server, and c) an external DNS server in the field in the VPN server setup.
On a separate Mac, run the host command to see if the IP address resolves:
123.456.789.012 is the IP address of the host.
It should return the domain name:012.789.456.123.in-addr.arpa domain name pointer some domain.com as the result of a reverse lookup.
If it doesn’t, the domain’s name servers aren’t set up correctly.
If the IP address on a remote machine resolves correctly, either the VPN or DNS on the VPN machine is incorrectly configured, or there is a firewall configuration problem.
Pdq live! : using your vpn to manage your remote
The /etc/resolv.conf file specifies which DNS server should be used by the resolver libraries. A DNS server is needed even if you are using a VPN. Only then can contact with the specified DNS server be done via the VPN.
Since the path to the local network is not set through the VPN interface, if you use a DNS server on your local network (such as 172.17.0.1), the DNS query would not go through the VPN interface (check netstat -rn or ip route for details). Instead, the question will be routed via a different interface (possibly eth0, depending on your exact setup). Since the DNS question bypasses the VPN in this situation, you’ll have a DNS leak.