Why does one interface interfere with another?

[Greg Rundlett (freephile)]

Thanks Joshua,

"man interfaces" helped refresh my memory about the options besides "auto"

Greg Rundlett




On Mon, Jun 21, 2010 at 10:01 AM, Joshua Judson Rosen
<rozzin at geekspace.com>wrote:

> "Greg Rundlett (freephile)" <greg at freephile.com> writes:
> >
> > I have a system with two physical network interfaces; a cat45 ethernet
> port
> > and a wireless card - otherwise known as any normal computer.
> >man interfaces
> > I configured the wired interface (eth0) to be static by editing
> /etc/network/
> > interfaces (see bottom) and I let the network-manager applet handle the
> > networking system, making my wireless interface address governed by DHCP.
> >
> > When the wired port has no connection (because I connect the cable to
> another
> > system), the wireless gets all confused and doesn't connect.  Sometimes
> it
> > doesn't even show my wireless network (causing me to blame the Netgear
> > wireless router and reboot the wireless router.)  Trying a ping to the
> router,
> > it tries to go through the wired address.
>
> Yes--you're telling the system to always bring up eth0 at boot,
> and to set your default gateway to something out through eth0.
>
> > This happens even if there is NO wired connection from the time of
> > boot.
>
> You're asking for this by specifying "auto".
>
> It sounds like you want to use "allow-hotplug" and *not* "auto";
> then you can have have network-manager or ifplugd manage the interface
> exclusively, sense whether there's a cable attached, and automatically
> ifup/ifdown the device when you connect/disconnect the cable.
>
> --
> "Don't be afraid to ask (λf.((λx.xx) (λr.f(rr))))."
>
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