[Dnsmasq-discuss] DHCP and DNS regestration

[support | IT visibility]

Hi *,

 

I'm using dnsmasq with a few vlan interfaces and each interface is tagged.

And running tests with pihole as well as native dnsmasq.

An example on how this is setup in both cases (.i.e. pihole as well as
native dnsmsaq):

=====

# Wired - vlan 210

interface=eth0.210

domain=wired.lan,192.168.210.0/24,local

dhcp-range=set:vlan-210,192.168.210.11,192.168.210.99,168h

dhcp-option=tag:vlan-210,option:router,192.168.210.241

dhcp-option=tag:vlan-210,option:dns-server,192.168.210.235

dhcp-option=tag:vlan-210,option:ntp-server,192.168.210.235

dhcp-option=tag:vlan-210,option:domain-name,wired.lan

=====

 

The idea behind this is that devices with multiple vlan interfaces have
their IP's registered with dhcp and dns.

The dhcp part seems to work - all interfaces have the correct IP details.

However, the log has numerous wrong-address errors like this (i.e. pihole as
well as native dnsmasq):

=====

Mar 24 09:02:03 dnsmasq-dhcp[49]: DHCPREQUEST(eth0.210) 192.168.210.201
bc:24:11:87:be:e5

Mar 24 09:02:03 dnsmasq-dhcp[49]: DHCPNAK(eth0.210) 192.168.210.201
bc:24:11:87:be:e5 wrong address

Mar 24 09:02:03 dnsmasq-dhcp[49]: DHCPDISCOVER(eth0.210) bc:24:11:87:be:e5

Mar 24 09:02:03 dnsmasq-dhcp[49]: DHCPOFFER(eth0.210) 192.168.210.201
bc:24:11:87:be:e5

Mar 24 09:02:03 dnsmasq-dhcp[49]: DHCPREQUEST(eth0.210) 192.168.210.201
bc:24:11:87:be:e5

Mar 24 09:02:03 dnsmasq-dhcp[49]: DHCPACK(eth0.210) 192.168.210.201
bc:24:11:87:be:e5 osiris

=====

Question-1: where are these wrong-address messages coming from?

 

If I look at the dhcp.leases (Pihole) or dnsmasq.leases (native dnsmasq)
there is always one entry like this:

1743408124 bc:24:11:87:be:e5 192.168.230.201 osiris *

Question-2: why is there only an entry from the last vlan interface of (in
this example) osiris? And not one for every vlan interface?

 

Question-3: the same applies for dns regestrations where there is only an
entry for the last vlan interface?

I have tried to force this dns regestration for all fqdn's for each vlan
using the following settings (i.e. pihole as well as native dnsmasq):

dhcp-ignore-clid

dhcp-fqdn

dhcp-client-update

expand-hosts

domain-needed

domain=lan

local=/lan/

 

Does the above ring any bells? Any suggestion?

 

 

With warm regards - Will

 

 

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/attachments/20250324/554363f4/attachment.htm>