edit the following line in /etc/inittab id:5:initdefault: and change it to id:3:initdefault: so if  you reboot the default running level is 3 which is not GUI For Debian 8-9/Jessie-Stretch use the following command: In order to make text boot the default under systemd (regardless of which distro, really): systemctl set-default…

Let’s assume our network interface is eth0. Then there is a file /etc/sysconfig/network-scripts/ifcfg-eth0 which contains the settings for eth0. We can use this as a sample for our new virtual network interface eth0:0: cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0:0 Now we want to use the IP address 192.168.0.101 on the virtual interface eth0:0….

Here is what I need to do-  I want to block ping on eth0- my external link I want to open everything else on eth1- internal link Let’s assume eth0- has public IP and eth1 has private IP I want to allow SSH, auth, httpd and certain protocols to eth0….

Before I start I DNAT, I’d better say what it does-   The DNAT target is used to do Destination Network Address Translation, which means that it is used to rewrite the Destination IP address of a packet. If a packet is matched, and this is the target of the rule, the packet, and all…