Hi All,

I'm running dnsmasq 2.76 on a Raspberry Pi. It's been working great for
months but today I started seeing an odd behavior for a specific local
device and I don't know how to troubleshoot it.

The device is a Dell Inspiron 5577 Windows 10 Home edition laptop with the
latest Windows updates. It's getting an IP address of 192.168.1.115. I
first noticed the problem when I tried to establish a VNC connection to it
because I can't connect via its hostname, "sagan", but I can connect via
its IP address.

Neither the IP assignment nor the laptop's MAC address appear in
dnsmasq.leases. The only reason I know it is assigned .115 is by physically
going to the laptop and running the Windows 'ipconfig' program at the
command prompt.

I've rebooted the Raspberry Pi and the Windows 10 laptop, but it hasn't
made a difference.

More info below. Does anyone have any ideas?

Regards,
Todd


1. dnsmasq.log shows:

/var/log/dnsmasq.log:Feb 15 12:38:34 dnsmasq[738]: config 192.168.1.115 is
NXDOMAIN


2. I believe the following are the relevant dnsmasq config file entries.
These have been working for quite some time. I'm obfuscating the full MAC
address:

dhcp-host=f4:8e:38:xx:xx:xx,sagan


domain=si.loc
local=/si.loc/
expand-hosts


3.  $ dnsmasq --test

dnsmasq: syntax check OK.


4. Using the program WinIPConfig2012 a.k.a. WinIPConfig 4.0
<http://www.pkostov.com/wordpress/?p=19>, I've verified that the laptop is
using the Raspberry Pi as the DHCP server. There's no other DHCP server on
my network that I know of.

5. On a third computer, a Macintosh, I get these results. The Raspberry Pi
is at 192.168.1.40.

$ ping sagan

      *ping: cannot resolve sagan: Unknown host*

$ ping sagan.si.loc

      *ping: cannot resolve sagan.si.loc: Unknown host*

$ dig sagan

     ; <<>> DiG 9.8.5-P1 <<>> sagan
     ;; global options: +cmd
     ;; Got answer:
     ;; ->>HEADER<<- opcode: QUERY, status: *NOERROR*, id: 21157
     ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

     ;; QUESTION SECTION:
     ;sagan.                            IN      A

     ;; Query time: 1 msec
     ;; SERVER: 192.168.1.40#53(192.168.1.40)
     ;; WHEN: Thu Feb 15 13:22:25 PST 2018
     ;; MSG SIZE  rcvd: 23

$ dig sagan.si.loc

     ; <<>> DiG 9.8.5-P1 <<>> sagan.si.loc
     ;; global options: +cmd
     ;; Got answer:
     ;; ->>HEADER<<- opcode: QUERY, status: *NXDOMAIN*, id: 11132
     ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

     ;; QUESTION SECTION:
     ;sagan.si.loc.                     IN      A

     ;; Query time: 1 msec
     ;; SERVER: 192.168.1.40#53(192.168.1.40)
     ;; WHEN: Thu Feb 15 13:22:26 PST 2018
     ;; MSG SIZE  rcvd: 30

$ nslookup sagan

     Server:            192.168.1.40
     Address:   192.168.1.40#53

     Non-authoritative answer:
     *** *Can't find sagan: No answer*

$ nslookup sagan.si.loc

     Server:            192.168.1.40
     Address:   192.168.1.40#53

     ** *server can't find sagan.si.loc: NXDOMAIN*
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