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Article #127

Re: asymmetric TCP/IP for 'simplex' cable modems?

#127
From: Christopher Cradock
Date: Mon, 30 Mar 1998 00:00
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Przemek Klosowski <przemek@rrdjazz.nist.gov> wrote in article
<541zvk3gx8.fsf@rrdjazz.nist.gov>...
> My local cable company is going to offer a cable modem capability,
> soon.  The speed is supposed to be around 1MB/s but unfortunately they
> initially are deploying a one-way system: 
> 
> How would one go about setting up  a Linux system to route outgoing
packets
> via the PPP interface, while receiving the incoming traffic via Ethernet?

You need to enable routing in the kernel, then you setup your ethernet and
ppp link up as normal (you'll need two IP addresses, one for the ppp link
and one for the ethernet link). After that you send packets via ppp, and
the service returns them back to you via the ethernet link (as if they were
routed via a different route). The enabled routing switch in the kernel
makes sure that the linux box will pick up ethernet packets that it can
route, which it then determines is actually meant for it.

The only thing I don't know is whether the return link is actually a normal
pucker ethernet link.

Chris Cradock 
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From: "Christopher Cradock" <cradockc@oup.co.uk>
Subject: Re: asymmetric TCP/IP for 'simplex' cable modems?
Date: 1998/03/30
Message-ID: <01bd5bfd$a1db01a0$550450c2@PC04937>
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References: <541zvk3gx8.fsf@rrdjazz.nist.gov>
Organization: Oxford University Press
Newsgroups: comp.os.linux.development.system,dc.org.linux-users