[clug] What could be stopping dhclient from setting the default route?

[Michael Still]

I think netplan makes sense if you assume that all systems are cloud
instances. It is after all bed fellows with cloud-init. That said, that
assumption is not true.

Michael

On Mon, Feb 14, 2022 at 5:54 PM Bob Edwards <bob at cs.anu.edu.au> wrote:

> On 14/2/22 11:46 am, Tony Lewis via linux wrote:
> > On 14/2/22 11:25 am, Michael Still wrote:
> >> Do you have use-routes set to false in
> >> /etc/netplan/...whatever.that.filename.is... ?
> > No, it's not mentioned at all.
>
> Ahhh Netplan - the grand solution to a problem that few of us knew
> that we had... (and I still don't).
>
> Echoes of UUIDs and Systemd and Network interface renaming... All
> sorts of cleverness that is almost impossible to diagnose and debug
> until years after their introduction...
>
> Happy that Debian have resisted Netplan, at least in Bullseye...
>
> cheers,
> Bob Edwards (the Linux Luddite)
>
> >>
> >>
> https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fcanonical%2Fnetplan%2Fblob%2Fmain%2Fdoc%2Fnetplan.md&data=04%7C01%7Cu8909374%40uds.anu.edu.au%7Ce795a152b2cf43aab9b608d9ef537204%7Ce37d725cab5c46249ae5f0533e486437%7C0%7C0%7C637804168022640395%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=FTMSzzNc2rq2rsSaQD7bWYtNbr2xk4pRCj2TON1%2Bi6o%3D&reserved=0
> >> <
> https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fcanonical%2Fnetplan%2Fblob%2Fmain%2Fdoc%2Fnetplan.md&data=04%7C01%7Cu8909374%40uds.anu.edu.au%7Ce795a152b2cf43aab9b608d9ef537204%7Ce37d725cab5c46249ae5f0533e486437%7C0%7C0%7C637804168022640395%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=FTMSzzNc2rq2rsSaQD7bWYtNbr2xk4pRCj2TON1%2Bi6o%3D&reserved=0>
>
> >> for more details. Failing that, I'd run `netplan apply --debug` and
> >> see if that says anything helpful.
> >
> > `netplan --debug apply` gave debug info but didn't indicate any
> > problems.  Side note, `netplan apply --debug` gave nothing, and the
> > ubuntu man page's `netplan -debug apply` (single dash) didn't either.
> >
> > Tony
> >
> >
> >>
> >> Michael
> >>
> >> On Mon, Feb 14, 2022 at 11:11 AM Tony Lewis via linux
> >> <linux at lists.samba.org <mailto:linux at lists.samba.org>> wrote:
> >>
> >>     I am installing a couple of servers; at the moment, using a very
> >>     basic
> >>     Ubuntu 20.04 install.  When configuring the network, it selected
> DHCP
> >>     and showed a valid IP, and I leave it at that. However after
> >>     booting up,
> >>     there is no default route set.  I can't figure out why it's not
> >>     being set.
> >>
> >>     I can add the default route from the command line, and everything
> >>     works
> >>     until a reboot or until dhclient decides to refresh things. I have
> >>     used
> >>     wireshark to determine that the default route is being sent from the
> >>     DHCP server, both as an option 3 and as a "Next Server IP Address".
> >>
> >>     I have tried disabling apparmor (there was indications that a
> >>     dhclient
> >>     script was getting blocked), and I've tried tweaking parameters in
> my
> >>     server's dnsmasq config, but nothing seems to help.  I've also
> >>     upgraded
> >>     everything to the latest Ubuntu 20.04 packages.
> >>
> >>     Google shows that some people report problems like this, but they
> >>     aren't
> >>     exactly the same, and most are old.  Either way they don't solve
> >>     things
> >>     for me.
> >>
> >>     Any clues?
> >>
> >>     Tony
> >>
> >>     --     linux mailing list
> >>     linux at lists.samba.org <mailto:linux at lists.samba.org>
> >>
> >>
> https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.samba.org%2Fmailman%2Flistinfo%2Flinux&data=04%7C01%7Cu8909374%40uds.anu.edu.au%7Ce795a152b2cf43aab9b608d9ef537204%7Ce37d725cab5c46249ae5f0533e486437%7C0%7C0%7C637804168022640395%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=OeiqlrOmFagu9BkCKciEPGYXvr88lKChMZwSDH3RYVQ%3D&reserved=0
> >>
> >>
> >> <
> https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.samba.org%2Fmailman%2Flistinfo%2Flinux&data=04%7C01%7Cu8909374%40uds.anu.edu.au%7Ce795a152b2cf43aab9b608d9ef537204%7Ce37d725cab5c46249ae5f0533e486437%7C0%7C0%7C637804168022640395%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=OeiqlrOmFagu9BkCKciEPGYXvr88lKChMZwSDH3RYVQ%3D&reserved=0>
>
> >>
> >>
>
>