Configure Internet gateway (nat+squid) based on Ubuntu 16.04 LTS Server

11 january 2017, 08:02

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Today I will continue to tell about my experiment but that is about configuring the Router the Internet gateway Server based on Ubuntu 16.04 LTS. All operating systems installed on virtual machine on Hyper-V but also on a real piece of hardware is absolutely the same. To begin with we describe the introduction. We have a server running Ubuntu with two network interfaces, one of which is eth1, see the local internal network and eth0 is connected to the second external network may it be for example the network provider. As is a workstation with Windows 10 Pro which is located in the local internal network. The challenge is how to distribute the Internet to the workstation using Ubuntu server. The address space of the local network we have 10.0.0.024 and the local ip address of the server 10.0.0.1. The address of the external network, I have assigned to my home router via dhcp. In real conditions the address can be static so-called rated IPoE or PPPoE much difference in the setup will not. The main thing that was the Internet on the external interface of our Ubuntu servers and not to get lost in most of these interfaces for the first time is possible. Configuring network interfaces First, go to the system Server Ubuntu 16.04 in any convenient way. And edit the etcnetworkinterfaces file NAT Network Address Translation or network address translation. The mechanism of the TCPIP stack which allows the local IP networks to access the global network. Typically, this mechanism used a router which can be in the form of separate devices with a simple home router, or implemented using a conventional computer is the case. On Ubuntu, the implementation of the mechanism meets NAT network firewall called iptables. It is in all Unix-like operating systems. Iptables will be set to the sequence of rules based on which you will filter all network packets passing through our server. These filters are applied until you reboot so as not to set them after each boot the system will create a small script First create the script file with touch command Next, open it for editing Note that in the entry 10.0.0.024 means address the entire network with a mask of 255.255.255.0 rather than a specific ip address. Separately let me remind you that this is a private network ie. local and we have it configured on interface eth1. Save the changes to the file Ctrl+X then Y and Enter and give him the right to enforcement To get the script worked out for each download in the file etcnetworkinterfaces at the very bottom add the line and save it. Configuring DNS The function we are implementing DNS using dnsmasq. To get started, install it Change the following parameter is not forgetting to remove the comment from the line by removing the symbol To make it easier to search in the text editor nano

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