[Dnsmasq-discuss] What does this 'wrong server-ID' message mean?

[Chris Green]

I'm having a minor problem with my laptop and 'roaming WiFi', I've
just noticed the following sequence in syslog on the system that runs
as my DHCP/DNS server running dnsmasq:-

    Feb  5 21:32:52 dns dnsmasq-dhcp[385]: DHCPDISCOVER(eth0) 00:28:f8:3d:3b:aa
    Feb  5 21:32:52 dns dnsmasq-dhcp[385]: DHCPOFFER(eth0) 192.168.1.92 00:28:f8:3d:3b:aa
    Feb  5 21:32:55 dns dnsmasq-dhcp[385]: DHCPDISCOVER(eth0) 00:28:f8:3d:3b:aa
    Feb  5 21:32:55 dns dnsmasq-dhcp[385]: DHCPOFFER(eth0) 192.168.1.92 00:28:f8:3d:3b:aa
    Feb  5 21:32:55 dns dnsmasq-dhcp[385]: DHCPREQUEST(eth0) 192.168.1.102 00:28:f8:3d:3b:aa
    Feb  5 21:32:55 dns dnsmasq-dhcp[385]: DHCPNAK(eth0) 192.168.1.102 00:28:f8:3d:3b:aa wrong server-ID
    Feb  5 21:33:24 dns dnsmasq-dhcp[385]: DHCPREQUEST(eth0) 192.168.1.92 00:28:f8:3d:3b:aa 
    Feb  5 21:33:24 dns dnsmasq-dhcp[385]: DHCPACK(eth0) 192.168.1.92 00:28:f8:3d:3b:aa t470
    Feb  5 21:33:24 dns dnsmasq-dhcp[385]: DHCPDISCOVER(eth0) 00:28:f8:3d:3b:aa
    Feb  5 21:33:24 dns dnsmasq-dhcp[385]: DHCPOFFER(eth0) 192.168.1.92 00:28:f8:3d:3b:aa
    Feb  5 21:33:24 dns dnsmasq-dhcp[385]: DHCPREQUEST(eth0) 192.168.1.102 00:28:f8:3d:3b:aa
    Feb  5 21:33:24 dns dnsmasq-dhcp[385]: DHCPNAK(eth0) 192.168.1.102 00:28:f8:3d:3b:aa wrong server-ID
    Feb  5 21:33:29 dns dnsmasq-dhcp[385]: DHCPREQUEST(eth0) 192.168.1.100 7c:67:a2:57:6c:78
    Feb  5 21:33:29 dns dnsmasq-dhcp[385]: DHCPACK(eth0) 192.168.1.100 7c:67:a2:57:6c:78 DESKTOP-2S4CP78
    Feb  5 21:33:35 dns dnsmasq-dhcp[385]: DHCPREQUEST(eth0) 192.168.1.100 7c:67:a2:57:6c:78
    Feb  5 21:33:35 dns dnsmasq-dhcp[385]: DHCPACK(eth0) 192.168.1.100 7c:67:a2:57:6c:78 DESKTOP-2S4CP78
    Feb  5 21:34:39 dns dnsmasq-dhcp[385]: DHCPREQUEST(eth0) 192.168.1.100 7c:67:a2:57:6c:78
    Feb  5 21:34:39 dns dnsmasq-dhcp[385]: DHCPACK(eth0) 192.168.1.100 7c:67:a2:57:6c:78 DESKTOP-2S4CP78
    Feb  5 21:34:45 dns dnsmasq-dhcp[385]: DHCPREQUEST(eth0) 192.168.1.100 7c:67:a2:57:6c:78
    Feb  5 21:34:45 dns dnsmasq-dhcp[385]: DHCPACK(eth0) 192.168.1.100 7c:67:a2:57:6c:78 DESKTOP-2S4CP78
    Feb  5 21:35:37 dns systemd[1]: Started Session c4 of user chris.
    Feb  5 21:36:44 dns dnsmasq-dhcp[385]: DHCPREQUEST(eth0) 192.168.1.100 7c:67:a2:57:6c:78
    Feb  5 21:36:44 dns dnsmasq-dhcp[385]: DHCPACK(eth0) 192.168.1.100 7c:67:a2:57:6c:78 DESKTOP-2S4CP78
    Feb  5 21:36:45 dns dnsmasq-dhcp[385]: DHCPREQUEST(eth0) 192.168.1.100 7c:67:a2:57:6c:78
    Feb  5 21:36:45 dns dnsmasq-dhcp[385]: DHCPACK(eth0) 192.168.1.100 7c:67:a2:57:6c:78 DESKTOP-2S4CP78
    Feb  5 21:37:14 dns dnsmasq-dhcp[385]: DHCPDISCOVER(eth0) 7c:67:a2:57:6c:78
    Feb  5 21:37:14 dns dnsmasq-dhcp[385]: DHCPOFFER(eth0) 192.168.1.100 7c:67:a2:57:6c:78
    Feb  5 21:37:14 dns dnsmasq-dhcp[385]: DHCPDISCOVER(eth0) 7c:67:a2:57:6c:78

So what's happening around that DHCPNAK message?

-- 
Chris Green