The actual number of hosts will be fewer that listed because addresses on each subnet will be reserved as a broadcast address, etc. Most private networks conform to this scheme. This is defined by RFC 1918 (IPv4) and by RFC 4193 (IPv6). They range from 192.168.0.1 to 192.168.254.254 for a typical small business or home network and are often referred to as private network addresses. Typically the external IP address is assigned to you by your Internet Service Provider (ISP).Ī note on private network IP addresses: A set of IP addresses has been reserved by IANA for private networks. Use the IP Address range reserved for local LAN use. The computers (any OS) on the interior Local Area Network (LAN) will have a locally configured IP address. The gateway Linux computer will need two IP addresses and network connections, one to the private internal network and another to the external public internet. The Linux OS interface which enables one to configure the kernel for masquerading is either iptables (Linux kernel 2.4) or ipchains (Linux kernel 2.2). The request is returned to the gateway which then translates the IP address to computer on the private network which made the request. The request for the web page is sent to the web site using the external internet IP address of the gateway. This request is recognized to be beyond the local network so it is routed to the Linux gateway using the private network address. Network Address Translation (NAT) allows an individual on a computer on a private network to point their web browser to access a site on the internet via a gateway computer connecting the local LAN to the internet. Network Address Translation (NAT) and Network Topologies: Configure systems on the internal network to use the gateway.Turn on the forwarding of network traffic through the gateway.Configure a Linux "gateway" system with two network ports, one for the external network and, one for the internal local NAT network.Determine a network topology - what IP addresses shall we use?.Setting up a Linux system as a NAT gateway router requires the following steps: Iptables/ipchains can also be configured so that the Linux computer acts as a firewall, providing protection to the internal network. Using Linux and iptables / ipchains one can configure a gateway which will allow all computers on a private network to connect to the internet via the gateway and one single external IP address, using a technology called "Network Address Translation" (NAT) or masquerading along with a private subnet (private local area network). In the case of most dial-up PPP connections and some cable modem connections, only a single IP address is issued allowing only one computer to connect to the internet at a time. This tutorial will cover using a Linux computer as a gateway router between a private network and the internet.Īny internet connection whether it be a dial-up PPP, DSL, cable modem or a T1 line can be used. Use SOCKS gateway proxy software running on Linux.This is the method covered in this tutorial. Use Linux ipchains / iptables and IP forwarding to configure Linux as a.Methods of connecting your private network to the internet:
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