Re: PPPoverEthernet vs. PPPoverATM
Hello,
This is actually not true. PPPoE transport the ppp frame between the pppoe client and the adsl box, which
will decapsulate the ethernet header and will send back the ppp frame encapsulated in ATM cell, so, no
additionnal overhead.
The fact to use or not the routing faciluity of the alcatel box is another possibility, definitively.
JeF
On Fri, Feb 22, 2002 at 04:47:02PM +0100, VERBEEK, Francois wrote:
> Note that PPPoE is anyway encapsulated in ATM so you eventually get an additional (and useless) overhead.
> Some say you never feel it, others say you do.
> Anyway, to avoid unnecessary encapsulation is always an advantage.
> The hack of Alcatel SpeedTouch home to SpeedTouch Pro is worth it, seeing as you avoid such an additional encapsulation.
> BTW, a SpeedTouch home changed to a SpeedTouch pro does not offer any open port (doesn't even respond to ping) so it may be considered as quite secure (if you don't define a default internal server in the NAT parameters). http://www.sateh.com (if I remember well)
>
>
>
>
> -----Original Message-----
> From: Jean-Francois Dive [SMTP:jef@linuxbe.org]
> Sent: Thursday, February 21, 2002 2:17 PM
> To: linux_abbestia@virgilio.it
> Cc: debian-user@lists.debian.org; debian-security@lists.debian.org
> Subject: Re: PPPoverEthernet vs. PPPoverATM
>
> Hello,
>
> The adsl protocol is based on ATM anyhow. ATM cells leave the CPE (the thing which
> have the phone line in) to reach the local DSLAM which aggregare multiple client
> and then goes in a WAN which may be quite a lot of things. The question to know
> if you have to run pppoe or pppoatm is to know how you'll connect to the phone line:
> for exemple, if you have an ADSL pci card or a USB modem, then the ATM session will be
> started on the PC running this adapter, so you need to have ATM and pppoatm support
> in linux. This is doable, depending on the card you have, i configured it sucessfully
> on a debian + alcatel speedtouch USB.
>
> In your scheme, you'll neeed the cisco to run a pppoe client service, to start the ppp
> connection from there. Cisco support for pppoe have been introduced in 12.1 or 12.1T
> if i remember correctly and is in the stable (well stable ..) 12.2 main train. I thing
> is that i am sure the feature exist for the 827, but am definitively not sure for the
> 2500. In all cases, a simple debian box with 2 cards will give you the same features and
> more.
>
> hope that help,
>
> JeF
>
> On Thu, Feb 21, 2002 at 08:56:55AM +0100, linux_abbestia@virgilio.it wrote:
> > I'm about to turn to ADSL connection to Internet and I'm taking in consideration
> > all the choises the Provider offer. I was surprised in seening they offer
> > an ADSL service not only using the PPP-over-Eth protocol, but also with
> > the PPP-over-ATM. So my question is: if I choose the second system, is debian
> > support it? what is the best configuration (I think I will use the following
> > hardware: ADSL modem + Cisco 25xx router through Ethernet cable connection)?
> > Thanx in advance!
> >
> > §§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§§
> > GNU/Debian Linux RULES anyhow!
> >
> >
> >
> >
> > --
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> --
> -> Jean-Francois Dive
> --> jef@linuxbe.org
>
>
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