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

Tony Lewis tony at lewistribe.com
Mon Feb 14 00:46:10 UTC 2022

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.
> https://github.com/canonical/netplan/blob/main/doc/netplan.md 
> <https://github.com/canonical/netplan/blob/main/doc/netplan.md> 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.


> 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
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