Re: Internal dhcp unable to acquire IP from certain routers, breaking network connection for many users

[Mleman <mleman1217 posteo org>]

Thomas,

I just tried

nmcli connection modify <conn> ipv4.dhcp-client-id 01:xx:xx:xx:xx:xx:xx

using the MAC address of the adapter and I got an IP. So it seems to be 
related to the client ID as you suspected.

Strangely, I have been unable to undo this change and getting back to 
the non-working state for further testing. Tried deleting the setting 
from system-connections, setting a different insanely long one, 
rebooting, deleting the lease in the router web interface. Still, I am 
always getting an IP immediately. Something must be caching this. So for 
today I am unable to do additional testing.

So I guess Linksys LRT224 is not compliant to RFC4361 then and setting 
client ID is a viable workaround. Do you consider this case "closed" or 
do you need additional info for debugging?

Kind regards,
mleman

Am 03.01.2018 18:55 schrieb Thomas Haller:
> On Tue, 2018-01-02 at 17:57 +0100, Mleman wrote:
> > Thomas,
> >
> > thank you for your reply. I will report to the distro maintainers
> > regarding their compilation defaults.
> >
> > As for the non-working DHCP handshake, I did as advised and generated
> > a
> > log with level=TRACE and pasted it on https://pastebin.com/qTbDWJb1
>
> Hi,
>
>
> Thanks for the logs.
>
> Looks similar to bug https://bugzilla.gnome.org/show_bug.cgi?id=767515
>
> Does the workaround described there help?
>
> best,
> Thomas