On Tuesday 26 Jul 2016 21:24:12 Alan McKinnon wrote: > On 26/07/2016 18:53, Andrew Lowe wrote: > > On 27/07/16 00:10, Alan McKinnon wrote: > >> On 26/07/2016 18:01, Andrew Lowe wrote: > >>> Hi all, > >>> > >>> I can remember in the distant past that I had to have my modem > >>> > >>> turned on before the computer otherwise, I wouldn't get an IP address. > >>> Then something changed. One day I forgot to turn on the modem first. I > >>> turned the machine on then realised the modem wasn't on, I turned it, > >>> the modem, on and prepared to reboot the machine only to see an IP > >>> address appear. > >>> > >>> It appeared that dhcp was now periodically attempting to get an > >>> > >>> address whereas in the past, if on boot it didn't find one, that was it, > >>> it just gave up. It appears that my machine has now, for some reason > >>> reverted to "the olden days" of IP address allocation. No modem at boot, > >>> no IP address. Reboot the machine, with the modem continuing to run, and > >>> I get an IP address. When I have no IP address, I can run "dhcpcd > >>> restart" and I'll get one. > >>> > >>> Anyone got any idea as to what has changed? What should I be looking > >>> > >>> for to fiddle to get my preferred behaviour, modem/machine startup in > >>> any order and I'll get an IP address. Is there a dchp "polling time" or > >>> something similar that I need to set to get this running nicely again? > >>> > >>> Thoughts greatly appreciated, > >>> > >>> Andrew > >> > >> There's no single global default, that is set is whatever dhcp client > >> you are using. Which one is it? > > > > dhcpcd > > Thanks. What's in your /etc/dhcpcd.conf and related network > configs/settings?
dhcpcd will set up an IPv4LL (aka APIPA, zeroconf, et al) address unless configured not to do so with the -L option. Once an IPv4LL address is set, then it will scout for an IP address lease every now and then and obtain one when a dhcp server comes on stream and offers one. Daemons like ifplugd will run dhcpcd to obtain an address when they sense a link on your configured interface. -- Regards, Mick
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