You are actually asking about a couple of different things.  First, your 'Wireless Modem' (actually a wireless router/modem) is only involved with the Internet (also referred to as WWW) and the assigning of IP Addresses for devices inside of LAN for the purposes of becoming a portion of the world wide Internet.  This is what allows you to connect to sites like Google, Amazon, and CNN.  Things that are on the outside of you router/modem are said to be on the WAN (Wide Area Network) and things inside of the router/modem are said to be on the LAN (Local Area Network).  In unRAID, we use the LAN to connect to the GUI.  Everything on the Internet is accessed by its IP address and a DNS server looks up things like CNN.com and returns back the proper IP address.  The router portion of your Router/modem does this for your LAN.   SMB is a second network that is totally independent of the Internet.  However, it does require that all of the computers which attach to it have an IP address.  There are two ways (in the modern world) to get an address assigned.  The first way is to use a DHCP server.  (SMB itself does not have any DHCP functionality built into it.)  This will be done by your Wireless Modem.  The second way is to assign the IP addresses manually.  (We used to have to do this back in the days when we used dial-up modems.)  (Many of us still assign assign static IP addresses to our unRAID servers.  It seems to make life much simpler if one wants to use the NFS protocol.)  With unRAID, most of us use SMB to gain access to the files on the array.  On the SMB network, the Local Master is the server that translates your server/client name to its IP address.    One more point, ANY computer or other device that runs SMB can become the Local Master. There is no restriction and many Devices (and ALL MS Windows computers) are enabled!  (BTW, SMB does not require a router/Modem to work! I ran SMB on 10Base2 which was a length of RG-58A/U coax between two or more computers back in the early 1990's!  And, furthermore, the original intend of SMB was to allow very small networks of computers to work together without the need of a dedicated server.)   So Yes, you do require two Masters (if you like) on your physical network.  (By the way, they use the same physical layer and hardware to conduct their communication.)  One to administer the LAN and WAN portion and the second to control SMB portion.    Now. let's look at the second part of your question.  Go to the "Settings" page, then click on the "SMB" icon (Microsoft flag), then you will see three tabs on that page.  Now, click on the "Workgroup Settings" tab.  That is where you will find the information on which server is the Local Master.  You will NOT see the yoda symbol UNLESS your server is the Local Master.  It does not become the Local Master just because you gave it permission to be come the Local Master--- BTW, that is what the "Local master browser:" allows.  It must also 'win' the periodical 'election' to become the Local Master!  You also have to give it permission to monitor which computer is the Local Master by enabling the "Monitor local master election:" option.  IF your server is not the Local Master, you will have to go to this page to find out which one is.   If you are having an election problem, let's take that up in a separate thread.