I can not access certain sites like youtube, facebook etc. I tried to
ping www.youtube.com but it gives me
ping: www.youtube.com: Name or service not known. When I try to ping without www it works
PING youtube.com (126.96.36.199) 56(84) bytes of data. 64 bytes from fra16s20-in-f14.1e100.net (188.8.131.52): icmp_seq=1 ttl=52 time=62.7 ms
Same happens for facebook. I tried both browser firefox and chrome, same problem. So what is wrong here and how to solve it?