Re: Routing between two gateways

Tony wrote: 
Hi guys,

I'm not able to solve a little problem with Linux Routing. I've a LAN
(192.168.4.0/24) and two internet connections (83.211.x.x and 81.175.x.x)
I use a Linux PC like a gateway for my LAN, and I route packet to
default gateway 83.211.x.x. My Linux PC's address is 192.168.4.2.
I'd like to set routing table to transparently route packets to the
other gateway (81.175.x.x) only for some PC of my LAN, the rest will pass
through default gw.

LAN's PC will have always Linux PC as default gw, this one will do
the dirty work :-)



The RFC 1918 addresses (like 192.168.x.y) are not routable
in the public Internet.

If you have two separate sites with routable Internet addresses,
and a private network connected to each, the method to connect
the private network segments together using the public Net as
the carrier, is called VPN, Virtual Private Network.

A VPN works by taking a packet from the internal network,
putting it inside an IP packet with the public addresses
and using the public addresses to transfer the wrapped packet
to the receiving end. The receiving end of the VPN connection
then unwraps the packet and forwards it to the final destination
via the local network.

To protect the privacy and integrity of the internal
network packets, they are usually encrypted before
packaging into the carrier packet and, of course, decrypted
after unpackaging at the receiving gateway.

There are many different ways to set up a VPN, and the method
of wrapping the network packets (usually called tunneling) varies
from one VPN to another.

My favourite to building VPN's is OpenVPN. It's available
for Linux and many versions of Windows (and many other systems).

HTH

--

Tauno Voipio
tauno voipio (at) iki fi
.

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