DHCP Server fails to start on boot

[SirGizmo]

I am trying to get my Raspberry Pi to become a DHCP server for my home network. I can get the DHCP server to work properly and my devices get an IP address if I type sudo dhcpd -cf /etc/dhcp/dhcpd.conf in the terminal.
If I reboot the Pi the DHCP server does hand out address and looking at the logs the dhcp fails.

Nov 10 16:07:28 raspberrypi dhcpd[436]: Wrote 12 leases to leases file.
Nov 10 16:07:28 raspberrypi dhcpd[436]:
Nov 10 16:07:28 raspberrypi dhcpd[436]: No subnet declaration for eth0 (no IPv4 addresses).
Nov 10 16:07:28 raspberrypi dhcpd[436]: ** Ignoring requests on eth0. If this is not what
Nov 10 16:07:28 raspberrypi dhcpd[436]: you want, please write a subnet declaration
Nov 10 16:07:28 raspberrypi dhcpd[436]: in your dhcpd.conf file for the network segment
Nov 10 16:07:28 raspberrypi dhcpd[436]: to which interface eth0 is attached. **
Nov 10 16:07:28 raspberrypi dhcpd[436]:
Nov 10 16:07:28 raspberrypi dhcpd[436]:
Nov 10 16:07:28 raspberrypi dhcpd[436]: Not configured to listen on any interfaces!
Nov 10 16:07:28 raspberrypi dhcpd[436]:
Nov 10 16:07:28 raspberrypi dhcpd[436]: If you think you have received this message due to a bug rather
Nov 10 16:07:28 raspberrypi dhcpd[436]: than a configuration issue please read the section on submitting
Nov 10 16:07:28 raspberrypi dhcpd[436]: bugs on either our web page at www.isc.org or in the README file
Nov 10 16:07:28 raspberrypi dhcpd[436]: before submitting a bug. These pages explain the proper
Nov 10 16:07:28 raspberrypi dhcpd[436]: process and the information we find helpful for debugging..
Nov 10 16:07:28 raspberrypi dhcpd[436]:
Nov 10 16:07:28 raspberrypi dhcpd[436]: exiting.

Any clue as to why the DHCPD will not start on boot but will run properly when I manually start the service?

[thagrol]

One possibility: does it try to read a different config file when started during boot up?

You can test this by manually starting it with

Code: Select all

sudo dhcpd -f

to let it load its config from the default location.

[SirGizmo]

I tried that command and the dhcpd service started without any errors.
I tried to find another dhcp config file but I could not find one.

[thagrol]

The only other possibility I can think of is that it's being started before the network is up.

Check "wait for network" is enabled in raspi-config or (and this is a hack) disable the systemd service and start it manually with a time delay via rc.local or cron

[mfa298]

The only other possibility I can think of is that it's being started before the network is up.

Check "wait for network" is enabled in raspi-config or (and this is a hack) disable the systemd service and start it manually with a time delay via rc.local or cron

To add to that you might want to consider how the Pi has it's IP address assigned to it.

For a DHCP server the address needs to be statically and needs to be up before the system tries to start dhcpd. In my case (I run isc-dhcp-server on a Pi2 here) I've removed the dhcpcd package (apt-get purge dhcpcd5) and manually configure the IP address via the old /etc/network/interfaces type method (actually using /etc/network/interfaces.d/eth0 as the config is automated).

[thagrol]

Yeah, I should have thought of that.

FYI, my dnsmasq based dhcp server has a static IP address assigned in /etc/dhcpcd.conf (along with staticly defind routers and DNS servers) and has "Wait for Network at Boot" set to "Yes". It's also the only dhcp server on my LAN.

[SirGizmo]

Looks like it is now working.
I removed the dhcpcd package (apt-get purge dhcpcd5) and added the static IP to /etc/network/interfaces.d/eth0.

[porrascarlos80]

I am having problems to boot dhcpd on rasp 3b

is it needed to edit this file?
/etc/dhcpcd.conf

I followed all the steps listed here , except 3 and 6
http://www.noveldevices.co.uk/rp-dhcp-server

not applicable for 3b?

[drjoms]

try 'systemctl status dhcpcd'
It may give you more idea.

also, '** Ignoring requests on eth0.' and 'Not configured to listen on any interfaces!' - are quite self explanatory.

try 'systemctl start dhcpcd' and see what errors that produces.
Thargol may also be onto something. But then error message says 'Ignoring requests on eth0' - kidn of assumes that eth0 exists. With that said, it may be a red herring. check DHCP config. Did you mess with it?

[bls]

I am having problems to boot dhcpd on rasp 3b

is it needed to edit this file?
/etc/dhcpcd.conf

I followed all the steps listed here , except 3 and 6
http://www.noveldevices.co.uk/rp-dhcp-server

not applicable for 3b?

Here are two forum posts that you may find useful: viewtopic.php?f=28&t=292384 and viewtopic.php?f=28&t=270859