On Tue, 24 Nov 2015, Siva Prasad Nath wrote: > auto eth0 > iface eth0 inet static > address 192.168.50.2 > netmask 255.255.255.0 That's a configuration for a Linux system running Debian or Ubuntu Linux. CentOS (the topic of this mailing list) and other distributions in the Red Hat family use a completely different syntax for network configuration. If you're completely new to Linux, I'd suggest you find a local Linux user group and get some hands-on help. -- Paul Heinlein heinlein at madboa.com 45°38' N, 122°6' W