Ubuntu server 16.04.1 LTS VPS, unable to resolve or ping any hostname or ip

i've a problem with my vps, i can't resolve any hostname and when i try to ping an hostname the server can't resolve it and ping too. i can't do apt get update or anything else that involve a hostname resolving. Can anyone help me? many thanks.

----apt-get update

Err:1 http://security.ubuntu.com/ubuntu xenial-security InRelease Temporary failure resolving 'security.ubuntu.com' Err:2 http://archive.ubuntu.com/ubuntu xenial InRelease Temporary failure resolving 'archive.ubuntu.com' Err:3 http://archive.canonical.com/ubuntu xenial InRelease Temporary failure resolving 'archive.canonical.com' Err:4 http://archive.ubuntu.com/ubuntu xenial-updates InRelease Temporary failure resolving 'archive.ubuntu.com' Reading package lists... Done W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/InRelease Temporary failure resolving 'archive.ubuntu.com' W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/InRelease Temporary failure resolving 'archive.ubuntu.com' W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease Temporary failure resolving 'security.ubuntu.com' W: Failed to fetch http://archive.canonical.com/ubuntu/dists/xenial/InRelease Temporary failure resolving 'archive.canonical.com' W: Some index files failed to download. They have been ignored, or old ones used instead.

----cat /etc/network/interfaces

Auto generated lo interface
auto lo iface lo inet loopback

Auto generated venet0 interface
auto venet0 iface venet0 inet manual up ifconfig venet0 up up ifconfig venet0 127.0.0.2 up route add default dev venet0 down route del default dev venet0 down ifconfig venet0 down

iface venet0 inet6 manual up route -A inet6 add default dev venet0 down route -A inet6 del default dev venet0

auto venet0:0 iface venet0:0 inet static address 23.94.xxx.xxx netmask 255.255.255.255

auto venet0:1 iface venet0:1 inet static address 23.94.xxx.xxx netmask 255.255.255.255

----iptables -L

Chain INPUT (policy ACCEPT) target prot opt source destination

Chain FORWARD (policy ACCEPT) target prot opt source destination

Chain OUTPUT (policy ACCEPT) target prot opt source destination

---ifconfig

lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

venet0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:127.0.0.2 P-t-P:127.0.0.2 Bcast:0.0.0.0 Mask:255.255.255.255 UP BROADCAST POINTOPOINT RUNNING NOARP MTU:1500 Metric:1 RX packets:1176 errors:0 dropped:0 overruns:0 frame:0 TX packets:1233 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:65749 (65.7 KB) TX bytes:136176 (136.1 KB)

venet0:0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:23.94.xxx.xxx P-t-P:23.94.xxx.xxx Bcast:23.94.xxx.xxx Mask:255.255.255.255 UP BROADCAST POINTOPOINT RUNNING NOARP MTU:1500 Metric:1

venet0:1 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:23.94.xxx.xxx P-t-P:23.94.xxx.xxx Bcast:23.94.xxx.xxx Mask:255.255.255.255 UP BROADCAST POINTOPOINT RUNNING NOARP MTU:1500 Metric:1