isc-dhcp-server ignoring requests because there are no IPv4 addresses configured

[Rudy Zijlstra]

Hi,


What is in your /etc/dhcpd.conf file?


Does it have a subnet declaration for the 192.168.129.x network?


Cheers


Rudy

On 02-02-2023 10:03, Markus Krainz wrote:
> Hi,
>
> not sure if this is the right place to ask. I recently installed 
> isc-dhcp-server on a new computer. This computer runs Armbian 22.11.4 
> Jammy based on Ubuntu 22.04.1 LTS.
> The isc-dhcp-server package version is 4.4.1-2.3ubuntu2.3.
>
> My  /etc/default/isc-dhcp-server contains:
> INTERFACESv4="eth0"
>
> However on some boots, systemd fails to start the isc-dhcp-server 
> service. Checking the logs I found:
>
>     Feb 02 09:36:02 rock64 sh[1162]: No subnet declaration for eth0
>     (no IPv4 addresses).
>     Feb 02 09:36:02 rock64 sh[1162]: ** Ignoring requests on eth0.  If
>     this is not what
>     Feb 02 09:36:02 rock64 sh[1162]:    you want, please write a
>     subnet declaration
>     Feb 02 09:36:02 rock64 sh[1162]:    in your dhcpd.conf file for
>     the network segment
>     Feb 02 09:36:02 rock64 sh[1162]:    to which interface eth0 is
>     attached. **
>     Feb 02 09:36:02 rock64 sh[1162]: Not configured to listen on any
>     interfaces!
>     Feb 02 09:36:02 rock64 sh[1162]: If you think you have received
>     this message due to a bug rather
>     Feb 02 09:36:02 rock64 sh[1162]: than a configuration issue please
>     read the section on submitting
>     Feb 02 09:36:02 rock64 sh[1162]: bugs on either our web page at
>     www.isc.org <http://www.isc.org> or in the README file
>     Feb 02 09:36:02 rock64 dhcpd[1162]: No subnet declaration for eth0
>     (no IPv4 addresses).
>     Feb 02 09:36:02 rock64 sh[1162]: before submitting a bug.  These
>     pages explain the proper
>     Feb 02 09:36:02 rock64 sh[1162]: process and the information we
>     find helpful for debugging.
>     Feb 02 09:36:02 rock64 sh[1162]: exiting.
>     Feb 02 09:36:02 rock64 dhcpd[1162]: ** Ignoring requests on eth0. 
>     If this is not what
>     Feb 02 09:36:02 rock64 dhcpd[1162]:    you want, please write a
>     subnet declaration
>     Feb 02 09:36:02 rock64 dhcpd[1162]:    in your dhcpd.conf file for
>     the network segment
>     Feb 02 09:36:02 rock64 dhcpd[1162]:    to which interface eth0 is
>     attached. **
>     Feb 02 09:36:02 rock64 dhcpd[1162]:
>     Feb 02 09:36:02 rock64 dhcpd[1162]:
>     Feb 02 09:36:02 rock64 dhcpd[1162]: Not configured to listen on
>     any interfaces!
>     Feb 02 09:36:02 rock64 dhcpd[1162]:
>     Feb 02 09:36:02 rock64 dhcpd[1162]: If you think you have received
>     this message due to a bug rather
>     Feb 02 09:36:02 rock64 dhcpd[1162]: than a configuration issue
>     please read the section on submitting
>     Feb 02 09:36:02 rock64 dhcpd[1162]: bugs on either our web page at
>     www.isc.org <http://www.isc.org> or in the README file
>     Feb 02 09:36:02 rock64 dhcpd[1162]: before submitting a bug. 
>     These pages explain the proper
>     Feb 02 09:36:02 rock64 dhcpd[1162]: process and the information we
>     find helpful for debugging.
>     Feb 02 09:36:02 rock64 dhcpd[1162]:
>     Feb 02 09:36:02 rock64 systemd[1]: isc-dhcp-server.service: Main
>     process exited, code=exited, status=1/FAILURE
>     Feb 02 09:36:02 rock64 dhcpd[1162]: exiting.
>     Feb 02 09:36:02 rock64 systemd[1]: isc-dhcp-server.service: Failed
>     with result 'exit-code'.
>
>
> However when I check the interfaces right after boot:
>
>     rock64:markus:# ip address
>     1: lo: [....]
>     2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state
>     UP group default qlen 1000
>         link/ether c2:48:08:12:53:18 brd ff:ff:ff:ff:ff:ff
>         inet 192.168.129.22/24 <http://192.168.129.22/24> brd
>     192.168.129.255 scope global noprefixroute eth0
>            valid_lft forever preferred_lft forever
>         inet6 fe80::c048:8ff:fe12:5318/64 scope link
>            valid_lft forever preferred_lft forever
>
>
> I have an ip address and subnet successfully statically set via my 
> applied netplan (renderer: NetworkManager).
>
> I double checked that network-online is a dependency for 
> isc-dhcp-server so it doesn't try to start before the IP address is 
> configured, but network-online is correctly already a dependency by 
> default:
>
>     rock64:markus:# systemctl list-dependencies isc-dhcp-server
>     isc-dhcp-server.service
>     ● ├─-.mount
>     ● ├─system.slice
>     ● ├─network-online.target
>     ● │ └─networking.service
>     ● └─sysinit.target [...]
>
>
> Any idea what could be the problem?
>
> Best regards
> Markus
>
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