DHCP problems while connecting with a Wifi AP

[David Wolfskill]

On Thu, Dec 27, 2018 at 01:25:17PM +0100, Matthias Apitz wrote:
> 
> Hello,
> 
> I'm using my (Ubuntu) mobile device as AP to connect my FreeBSD laptop
> to the Internet. While this is working fine most of the times, I
> encounter in some situation problems getting an IP addr with DHCP from
> the mobile. It looks somehow like a race condition between WPA
> associating and DHCP (dhclient) asking to early (and giving up). Here is
> a typical situation when it does not work:
> ... 
> Any ideas re/ the following question:
> 
> 1. How could I delay the dhclient until connection is fine?
> 2. Why the BOOTP/DHCP are not logged by the ipfilter?
> 
> This could smell as a problem caused by the AP, but any other device
> (for example an iPhone) connects fine and gets an IP addr.
> 
> Thanks
> 
> 	matthias
> ....

You might investigate the use of "synchronous_dhclient" in /etc/rc.conf:

     synchronous_dhclient
                 (bool) Set to “YES” to start dhclient(8) synchronously at
                 startup.  This behavior can be overridden on a per-interface
                 basis by replacing the “DHCP” keyword in the
                 ifconfig_⟨interface⟩ variable with “SYNCDHCP” or
                 “NOSYNCDHCP”.


FWIW, I use 'synchronous_dhclient="YES"' in my laptop's /etc/rc.conf,
(and have done since 2012/01/26 12:39:23).

Peace,
david
-- 
David H. Wolfskill				david at catwhisker.org
Yes, Mr. Trump, your behavior IS a disgrace -- to put it very nicely.

See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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