On Tue, Jul 10, 2018 at 04:38:42PM -0700, Gregory Nowak wrote:
> On Tue, Jul 10, 2018 at 02:34:52PM -0400, Haines Brown wrote:
> >   allow hotplug eth0
> I believe that should be allow-hotplug but since I'm still running
> jessie, it's possible this has changed in Ascii.

Greg, thanks for your reply. That missing hyphen just a type as I ran
from the machine with the problem to the one that has email.

> >   iface inet eth0 dhcp
> >   
> >   auto wlx2824ff1a1794
> You might want to replace that auto with another allow-hotplug.
> >   iface wlx2824ff1a1794 inet dhcp
> >     wpa-driver nl80211
> >     wpa-conf /etc/wpa_supplicant.conf

On my old machine, eth0 and wlan0 interfaces both auto, but without an
ethernet cable, only wlan0 gets an IP address and is RUNNING when the
machine booted. This is the behavior I want. On the new machine, both
interfaces are UP and RUNNING with (different) IP addresses.

I assume that with eth0 set to allow-hotplug and the wireless interface
set to auto, when I boot I should come up with a wireless connection

However, when I disconnect the the ethernet cable and do #
/etc/init.d/networking restart, although the wireless interface is UP
and RUNNING and has an IP address, I have no internet connection. No

I find that even with the eth0 stanza commented in
/etc/network/interfaces, I have to have the ethernet cable plugged in to
get a wireless connection. I fail to understand how this can be so.

> > I'm surprised to see both interfaces assigned an IP address even though
> > I'm currently using ethernet wired.
> Since you defined your usb interface in interfaces with auto instead
> of allow-hotplug, that doesn't surprise me.

Although this is not the behavior of my old machine (devuan jessie), in
which both interfaces are auto, although it has no CAT5 cable.

> > One problem is that no mail gets out. Exim main log says: "lookup failed
> > for all hosts in smarthost router: host_find_failed=ignore
> > hosts_all_ignore=defer. No IP address found for host...  Is this normal,
> > or does it point to trouble?
> I'd say points to trouble. If you're able to browse the web though,
> then this is probably an exim misconfiguration rather than the same issue.

If I can't resolve this, I'll raise the problem in a different thread.

> Did you read interfaces(5), ifup(8), and ifdown(8)? If you haven't,
> and it sounds like you haven't, go read them. Otherwise you're
> attempting to do something without having read the fine manual, and
> that is sure to fail.

I've read them many times over the years. Perhaps senility is creeping
in. Also at 84 after 8 hours of very intense work (unrelated to
computers), I don't function very well :-;.

> Greg
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