On Tue, Feb 05, 2019 at 09:44:19PM +, Chris Green wrote:
> 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?
>
Oops! I've just noticed I had another DHCP server running on the LAN!
I guess that might explain it.
--
Chris Green
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