DNS resolution problem with ubuntu

[agent41 0]

Hi everyone,

 

Since I changed the DNS servers from my internet box, I can only access to websites threw their IP (000.0.00.00) and not from their names (google.com). I think it's related to a DNS resolution problem.

I've tried some known issues on Ubuntu such as adding these lines to my ovpn files :

 

script-security 2

up /etc/openvpn/update-resolv-conf

down /etc/openvpn/update-resolv-conf

 

Here is my connection logs :

Fri Feb 10 21:18:45 2017 OpenVPN 2.3.10 x86_64-pc-linux-gnu [sSL (OpenSSL)] [LZO] [EPOLL] [PKCS11] [MH] [iPv6] built on Feb  2 2016
Fri Feb 10 21:18:45 2017 library versions: OpenSSL 1.0.2g  1 Mar 2016, LZO 2.08
Fri Feb 10 21:18:45 2017 Control Channel Authentication: tls-auth using INLINE static key file
Fri Feb 10 21:18:45 2017 Outgoing Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
Fri Feb 10 21:18:45 2017 Incoming Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
Fri Feb 10 21:18:45 2017 Socket Buffers: R=[212992->212992] S=[212992->212992]
Fri Feb 10 21:18:45 2017 UDPv4 link local: [undef]
Fri Feb 10 21:18:45 2017 UDPv4 link remote: [AF_INET]185.156.174.154:443
Fri Feb 10 21:18:45 2017 TLS: Initial packet from [AF_INET]185.156.174.154:443, sid=652c91ff 7fd6447f
Fri Feb 10 21:18:45 2017 VERIFY OK: depth=1, C=IT, ST=IT, L=Perugia, O=airvpn.org, CN=airvpn.org CA, emailAddress=info@airvpn.org
Fri Feb 10 21:18:45 2017 Validating certificate key usage
Fri Feb 10 21:18:45 2017 ++ Certificate has key usage  00a0, expects 00a0
Fri Feb 10 21:18:45 2017 VERIFY KU OK
Fri Feb 10 21:18:45 2017 Validating certificate extended key usage
Fri Feb 10 21:18:45 2017 ++ Certificate has EKU (str) TLS Web Server Authentication, expects TLS Web Server Authentication
Fri Feb 10 21:18:45 2017 VERIFY EKU OK
Fri Feb 10 21:18:45 2017 VERIFY OK: depth=0, C=IT, ST=IT, L=Perugia, O=airvpn.org, CN=Turais, emailAddress=info@airvpn.org
Fri Feb 10 21:18:46 2017 Data Channel Encrypt: Cipher 'AES-256-CBC' initialized with 256 bit key
Fri Feb 10 21:18:46 2017 Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Fri Feb 10 21:18:46 2017 Data Channel Decrypt: Cipher 'AES-256-CBC' initialized with 256 bit key
Fri Feb 10 21:18:46 2017 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Fri Feb 10 21:18:46 2017 Control Channel: TLSv1.2, cipher TLSv1/SSLv3 DHE-RSA-AES256-GCM-SHA384, 4096 bit RSA
Fri Feb 10 21:18:46 2017 [Turais] Peer Connection Initiated with [AF_INET]185.156.174.154:443
Fri Feb 10 21:18:48 2017 SENT CONTROL [Turais]: 'PUSH_REQUEST' (status=1)
Fri Feb 10 21:18:48 2017 PUSH: Received control message: 'PUSH_REPLY,redirect-gateway def1 bypass-dhcp,dhcp-option DNS 10.4.0.1,comp-lzo no,route-gateway 10.4.0.1,topology subnet,ping 10,ping-restart 60,ifconfig 10.4.5.70 255.255.0.0'
Fri Feb 10 21:18:48 2017 OPTIONS IMPORT: timers and/or timeouts modified
Fri Feb 10 21:18:48 2017 OPTIONS IMPORT: LZO parms modified
Fri Feb 10 21:18:48 2017 OPTIONS IMPORT: --ifconfig/up options modified
Fri Feb 10 21:18:48 2017 OPTIONS IMPORT: route options modified
Fri Feb 10 21:18:48 2017 OPTIONS IMPORT: route-related options modified
Fri Feb 10 21:18:48 2017 OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modified
Fri Feb 10 21:18:48 2017 ROUTE_GATEWAY 192.168.0.1/255.255.255.0 IFACE=wlp1s0 HWADDR=18:5e:0f:1a:0a:ea
Fri Feb 10 21:18:48 2017 TUN/TAP device tun0 opened
Fri Feb 10 21:18:48 2017 TUN/TAP TX queue length set to 100
Fri Feb 10 21:18:48 2017 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0
Fri Feb 10 21:18:48 2017 /sbin/ip link set dev tun0 up mtu 1500
Fri Feb 10 21:18:48 2017 /sbin/ip addr add dev tun0 10.4.5.70/16 broadcast 10.4.255.255
Fri Feb 10 21:18:53 2017 /sbin/ip route add 185.156.174.154/32 via 192.168.0.1
Fri Feb 10 21:18:53 2017 /sbin/ip route add 0.0.0.0/1 via 10.4.0.1
Fri Feb 10 21:18:53 2017 /sbin/ip route add 128.0.0.0/1 via 10.4.0.1
Fri Feb 10 21:18:53 2017 Initialization Sequence Completed

 

Thanks !

 

agent41

[OpenSourcerer 1483]

Since I changed the DNS servers from my internet box

 

Did you check whether these new servers really work?

[hugomueller 13]

is this a temporary issue or is it permanent?

if temporary:

https://airvpn.org/topic/21619-dns-name-resolution-from-10401-seems-to-fail-randomly-after-working-for-hours-or-days/?p=56278