Re: Networking basic - I want my own IP

From: Clive Dove (chdove_at_rogers.com)
Date: 07/17/03 

Date: Thu, 17 Jul 2003 04:14:02 GMT

steve wrote:

> This may attract some laughs but I am having trouble getting past move
> 1.
>
> I want to set up something like this:
>
>
> network modem
> Intel Box ---------------- Windoze Box ------------------ ISP
> --------- -----------
> Red Hat 7.2 Windows ME
> Oracle 8i MS Office
> Oracle clients
> e.g. Warehouse
> Builder
> email client
> Web browser
> |
> |
> Printer
> -------
>
> All the docs start by saying 'with your IP Address...'
>
> The questions are:
>
> - I suppose I will need an IP address for both the Linux and Windoze
> boxes. Can I just make them up or do I have to get them from
> somewhere?
> - My ISP uses dynamic IP assignment - I hever know what I will get
> from one session to the next. If I have already assigned my own IP
> Address to the MS box, what happens when I go on-line.
>
> I'm pretty confused here, I can tell ya.
>
> TIA

Your Windows box is serving the dual purpose of being a workstation and
a router/gateway between your local net and the internet.

So the WAN side of the windows box acquires the ip address from the isp
and the LAN side has an ip address in a private ip range such as
192.168.1.x. Addresses in the private range do not appear on the
internet.

So, if you assign 192.168.1.1 to the windows box and 192.168.1.2 to the
linux box (and 192.168.1.3 or higher to any additional boxes that you
may wish to hang on to the net through a hub) then:
The routing table in the linux box would have 192.168.1.1 as its default
routing.

The windows box would have the public gateway address assigned by the
isp as its default route and 192.168.1.1 as its route to the private
network.

The two ip address ranges are not affected by each other. The router
software in the windows box performs network address translation.

Of course, as your isp assigns dynamic ip addresses, this does not allow
you to have a publicly accessible server on the private net, but that
is contrary to the suthorized use policy anyway.

Your scheme is the reverse of what most people do who use computers as
routers. Usually they prefer to use a linux box as the router.

You should seriously consider obtaining a 4 port cable/dsl router (such
as the Linksys BEFSR41) to place between your two computers and your
broadband router. This device draws very little power, has no harddrive
or monitor, is easily configured from any computer connected to the lan
side using a browser, and relieves one of your computers from having to
stay running 24/7/365 for the benefit of the other computer(s).
Such a router handles the WAN side using DHCP or PPPoE or static ip,
depending on the requirements of the isp and internally uses DHCP or
static ip to assign the private ip addresses.
Your computers would all each have only one ethernet card and one ip
address and that ip would be in the private range which is a protection
against intruders. Any additional boxes would get their ip addresses
using DHCP.

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