Re: newbie gateway question
On Sun, 2006-04-23 at 23:43 +0100, Doofus wrote:
> Fernando Augusto Bender wrote:
>
> >On Sun, 2006-04-23 at 16:47 +0100, Doofus wrote:
> >
> >
> >>Fernando Augusto Bender wrote:
> >>
> >>
> >>
> >>>On Sun, 2006-04-23 at 15:51 +0300, Andrei Popescu wrote:
> >>>
> >>>
> >>>
> >>>
> >>>>Fernando Augusto Bender <fernando.bender@antiwindup.org> wrote:
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>>Something I missed... do your Debian box has an ethernet port?
> >>>>>I believe your Cable Modem does have an ethernet port as well.
> >>>>>
> >>>>>If it is so, your just connect them with an cross-over 10BaseT cable,
> >>>>>and you deploy your security measures, as well as monitoring and routing
> >>>>>issues.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>Not cross-over cable. Or maybe it depends on cable modem? Mine works
> >>>>with a patch (straight) cable.
> >>>>
> >>>>Andrei
> >>>>--
> >>>>If you can't explain it simply, you don't understand it well enough.
> >>>>(Albert Einstein)
> >>>>
> >>>>
> >>>>
> >>>>
> >>>Well, formerly straight cables were used to connect DTE to DCE.
> >>>
> >>>DCE-DCE or DTE-DTE shall be connected cross-over.
> >>>
> >>>DCE - data communication devices, like switch, modems, routers.
> >>>DTE - data terminal devices: hosts.
> >>>
> >>>
> >>>
> >>I suspect they were discussing CAT-5 ethernet cabling Fernando, not RS232.
> >>
> >>
> >>
> >>
> >
> >why do you say that, because of the DCE, DTE noums? They apply to any
> >cabling. It's something universal.
> >
> >I just wondered that because the cable modem could be attached the
> >ethernet interface and not necessarilly to the USB port.
> >
>
>
> dce/dte terminology used to describe ethernet wiring? Well there you go,
> I hear of something new every day. Does rts/cts also feature? And now
> you've confused me even more (it's easily done ;-) by thowing USB ports
> into the mix...
>
>
Fellow:
I'll try to be more clear.
DCE and DTE are not signals. They refer to equipments.
DTE stands for Data Terminal Equipment
DCE stabds for Data Communication Equipment
A modem no matter it's nature, is a DCE. A router either.
You define DCE by equipments that transmit data and do not generate
them.
A DTE, by its turn is any equipment that generate data. for example, a
Host where someone on a email client writes a message. The message it
self shall be sent to someone else. That's the data. As it's started in
the host, the host itself is a DTE.
It does not matter the protocol used to transfer the message to its
destiny. It my be a physical human-based transport. The host whre the
message were written will still be a DTE. So the Host where the message
shall be received.
RTS/CTS, stands for Ready to Send and Clear to Send, respectively.
This are very specific signals defined in RS232 and used by other
communciations protocols.
RTS is gnerated on the DTE, and CTS is a response of the DCE, usually
the Host sends RTS when he has a dialing command to send, and the DCE
answers with the CTS when he is ready to receive the commands in the
TX/RX wires. It might be also used as flow control techniques.
In the early original message,
"Debian's running on an 8 year old OEM machine with an AcerOpen
motherboard that has two USB ports. The cable modem is working fine now
connecting to a USB port on my XP box, so the question is what do I need
to do to switch it over?"
the author mensions a USB port. I do not understand much of USB ports,
beyond the fact it is a serial one.
As he have said it's debian box works fine in Internet, I wondered if he
would be able to use the ethernet port of the cable modem - if it has
one.
In a topology like,
All host in a switch,
The cable in the Debian host.
Debian is the gateway of the hosts; in one Debian NIC,
Modem is the gateway of Debian; in a second Debian NIC.
Unfortunatelly, as I reread my message, I made a mistake. I have said
cross-over. It shall be a straight cable between the modem and the host.
My apologizes.
By the way, this noums: DTE, DCE are very old. They are applied since
the very beggining of telcos at 300bps links. Probably named by Graham
Bell himself. :)
Carpe diem.
--
Ms. Eng. Fernando Augusto Bender
Pesquisador em Controle Automático
51 8401 4413
Use Linux: http://www.debian.org
Comer, beber e amar. O resto não vale um níquel.
Lord Byron
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