*BSD News Article 95425


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From: Tony Griffiths <tonyg@OntheNet.com.au>
Newsgroups: sunya.cs.linux,comp.unix.bsd.freebsd.misc,comp.unix.bsd.openbsd.misc,comp.unix.netbsd.misc
Subject: Re: Ethernet
Date: Fri, 16 May 1997 10:52:55 +1000
Organization: On the Net (ISP on the Gold Coast, Australia)
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To: Jaime Kikpole <jk7023@cnsunix.albany.edu>
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Jaime Kikpole wrote:
> 
>         This is probably a bit misplaced, but I don't know enough about the
> subject to know where to ask.  So I appologize in advance.  My problem is
> basically a lack of knowledge about Ethernet.  I've heard of 10BaseT,
> 10Base2, 10Base5, etc.  I've heard of different kinds of cards, hubs,
> cables, standerds, and so on.

10BaseT		10 Mbps Ethernet over twisted-pair; requires a hub
10Base2		 "  "      "      "   thin-wire coax; no hub
10Base5		 "  "      "      "   thick-wire coax; no hub

> 
>         What I'd like to know is, in practical, home LAN terms, "What do I
> need to look into?"  Also, what is the overall view of these things?  Are
> all the 10Base*s non-interoperable?  Are they compatible?  Does one
only
> need an Ethernet card (of any variety) in each computer and a daisy-chained
> wiring structure?  Any other questions that I didn't ask, I ment to.  :)

It is possible to get from one wiring scheme to another by using
appropriate converters.  Eg.  Twisted-pair <=> Thin-wire
In general, you would want to "standardise" your home computers on only
one wiring scheme, either Thin-wire coax (easiest if machines are
closely located) or Twisted-pair which requires that you also buy a hub
which are not that expensive these days.

> 
>         Any references (i.e. URLs or books) would be a great help, too.  My
> goal is to make a three node LAN in my apartment and have the ability to
> route all TCP/IP traffic out through a specific computer, through its modem,
> and into a dynamic IP dial-up.  Thanks in advance.

Unless you can get you ISP to allocate multiple FIXED IP addresses to
you (unlikely!), the 'internal' network will need to use one of the
NOT_TO_BE_ROUTED_ON_THE_INTERNET networks combined with either a proxy
gateway or NAT (Network Address Translation).

Given your relative lack of knowledge on Ethernet networking, I suspect
that you are in for an "interesting" time...

Tony