On Mon, Mar 24, 2025 at 10:18:23PM +0000, Simon Kelley wrote: > > > On 3/24/25 09:47, support | IT visibility via Dnsmasq-discuss wrote: > > 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
See below > > 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? 4: Does the above ring any bells? 5: Any suggestion? > > With warm regards – Will > > > > > > Answer 1: Because a lease exists for the relevant MAC address with a > different IP address to the address it's requesting. > > Answer 2: Because the device is using the same MAC address on all the VLANS > it's talking through. The MAC address is supposed to be unique: a DHCP > server won't allow a MAC address to have more than one lease. > > Answer 3: Partly the same answer as 2, but even if you use unique MAC > addresses (or client-ids) dnsmasq will only associate a DNS name with at > most one DHCP lease. That's a design decision. > 4: The bell of my early days with dnsmasq :-) 5: Check the manual page, it has something like gratuitous tag for interface name The > > # 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 can be > > # Wired - vlan 210 > > interface=eth0.210 > > domain=wired.lan,192.168.210.0/24,local > > dhcp-range=tag:eth0.210,192.168.210.11,192.168.210.99,168h > > dhcp-option=tag:eth0.210,option:router,192.168.210.241 > > dhcp-option=tag:eth0.210,option:dns-server,192.168.210.235 > > dhcp-option=tag:eth0.210,option:ntp-server,192.168.210.235 > > dhcp-option=tag:eth0.210,option:domain-name,wired.lan Groeten Geert Stappers -- Silence is hard to parse _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
