network restart

Mike Kenny inzanix at
Tue Jan 24 09:49:47 UTC 2006

Thanks Billy,

I found my problem, I was missing the line 'auto eth0' in
and, unfortunately no, if I try and connect to the corporate n/w and the
external ADSL simultaneously, I will no longer have to worry about the
corporate side of things. My association with that entity will be terminated


On 1/24/06, Billy Verreynne (JW) <VerreyB at> wrote:
> Mike Kenny wrote:
> ==
> I occasionally need to switch my ethernet cable to a direct (ADSL)
> connection rather than going through the corporate filrewalls (or not
> as the case might be :-). With windows the configuration of eth0 it
> update automatically when I switch cables, with various linuxes it may
> be update automatically otherwise /etc/init.d/network restart
> accomplishes this action.
> With Ubuntu 5.10, first there is no /etc/init.d/network, it seems to
> ahve been replaced by /etc/init.d/networking and secondly this does
> not bring up eth0. I am left with just lo0. A reboot with the same
> cable connected brings the system up on the non-corporate n/w.
> Any ideas how I can accomplish automatically or at least without
> reboot?
> ==
> ADSL usually runs over a PPPOE driver and interface Mike - which is
> separate from the eth0 interface (yes the access concentrator if found
> via eth0 cable, but the o/s creates a different network device in the
> /dev tree for it, usually /dev/ppp0).
> Conversely, you can configure multiple Internet protocol stacks on a
> single interface, e.g. eth0:0 eth0:1 etc. Each additional config can
> have different details.
> You can also have both the eth0 and ppp0 devices up at the same time.
> I'm not exactly sure what the problem is... If you want to start an
> ADSL session, you use the 'pon' command, followed by the config
> filename to use (this file will be /etc/ppp/peers). The 'plog' command
> shows you the status (success or failure) of the ADSL connection. The
> 'poff' command turns it off.
> So if I read this correctly you can, after unplugging the standard
> network cable, down the eth0 interface as that network is no longer
> reachable, e.g.
> # ifdown eth0
> Then you plug in the ADSL cable (which goes into the ADSL
> router/modem/whatever) into the network card. Now the ADSL network can
> be brought up using:
> # pon adsl-provider
> It would be much easier running both at the same time though and not
> muck about with plugging/unplugging cables. Surely the ADSL router can
> be cascaded from your existing ethernet port (cross over UTP likely
> needed) - and then you run a normal UTP cable from the ADSL router
> into your PC.
> --
> Billy
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