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Today's Topics:
1. isc-dhcp-server ignoring requests because there are no IPv4
addresses configured (Markus Krainz)
2. Re: isc-dhcp-server ignoring requests because there are no
IPv4 addresses configured (Rudy Zijlstra)
----------------------------------------------------------------------
Message: 1
Date: Thu, 2 Feb 2023 10:03:52 +0100
From: Markus Krainz <l...@gmx.at>
To: dhcp-users@lists.isc.org
Subject: isc-dhcp-server ignoring requests because there are no IPv4
addresses configured
Message-ID:
<CAFLv2g03DUBzDLa+8Ni5zCHU_OJs9x1MOXFDUecNi95Gh=0...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
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
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 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 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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Message: 2
Date: Thu, 2 Feb 2023 10:10:13 +0100
From: Rudy Zijlstra <r...@grumpydevil.homelinux.org>
To: dhcp-users@lists.isc.org
Subject: Re: isc-dhcp-server ignoring requests because there are no
IPv4 addresses configured
Message-ID:
<9b4f013c-04af-cc6a-d451-faa1b855f...@grumpydevil.homelinux.org>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
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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