title: DHCP Issue on home network
body: <p>I have an issue on my home office network - I'm not a networking expert in any way but I have a home network with a Samba NAS and an internal webserver for testing websites (my main role).
  The PlusNet router is putting out DHCP in the range 192.168.1.100-199.   Servers are fixed IP.
  Client machines are picking up DHCP in the range 192.168.10.100- 200 with a default gateway of 192.168.10.1  - no devices on the network have this IP address and I cannot work out where this device is.</p>
  <pre><code>Wireless LAN adapter WiFi:
  
     Connection-specific DNS Suffix  . :
     Description . . . . . . . . . . . : 802.11n USB Wireless LAN Card
     Physical Address. . . . . . . . . : 00-36-76-01-70-01
     DHCP Enabled. . . . . . . . . . . : Yes
     Autoconfiguration Enabled . . . . : Yes
     Link-local IPv6 Address . . . . . : fe80::495c:e9ba:9e2d:607c%13(Preferred)
     IPv4 Address. . . . . . . . . . . : 192.168.10.126(Preferred)
     Subnet Mask . . . . . . . . . . . : 255.255.255.0
     Lease Obtained. . . . . . . . . . : 14 December 2021 10:21:17
     Lease Expires . . . . . . . . . . : 15 December 2021 10:21:16
     Default Gateway . . . . . . . . . : 192.168.10.1
     DHCP Server . . . . . . . . . . . : 192.168.10.1
     DHCPv6 IAID . . . . . . . . . . . : 738211446
     DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-21-AC-DD-3C-A4-BA-DB-FE-C9-98
     DNS Servers . . . . . . . . . . . : 192.168.10.1
                                         8.8.8.8
                                         114.114.114.114
     NetBIOS over Tcpip. . . . . . . . : Enabled
  </code></pre>
  <p>Looking a the arp -a results I get:</p>
  <pre><code>Interface: 192.168.10.126 --- 0xd  (Wifi on my PC)
    Internet Address      Physical Address      Type
    192.168.1.7           d4-5d-64-ef-85-85     dynamic  (My PC)
    192.168.10.104        00-0b-82-41-14-e3     dynamic  (Grandstand IP Phone)
    192.168.10.113        00-f3-61-8e-f8-21     dynamic  (The Alexa)
    192.168.10.129        86-5f-83-17-ff-25     dynamic
    192.168.10.255        ff-ff-ff-ff-ff-ff     static
    224.0.0.22            01-00-5e-00-00-16     static
    226.178.217.5         01-00-5e-32-d9-05     static
    239.255.255.253       01-00-5e-7f-ff-fd     static
    255.255.255.255       ff-ff-ff-ff-ff-ff     static
  
  </code></pre>
  <p>I have started experimenting with SMART home - with Alexa and some bulbs but I cannot get Alexa to connect either - I don't think this is the problem though as when I unplug the Alexa the problem remains.</p>
  <p>Any thoughts?</p>
  <p>Thanks</p>
  <p>Dave</p>