The router holds information on hostnames of computers and devices that connect to the network using DHCP.
The hostnames are combined with the domain name (.fritz.box) to make the FQDN which the router will resolve when you lookup that from within the same network.
Note - I'm not talking about an external FQDN and in any case that is usually setup to resolve to the external IP of the router so should be avoided when connecting from inside the network.
Being a public DNS entry it rarely matches what you'll use on the LAN.
This only works if you are letting client and server devices use the FRITZ!Box as the DNS server for the network (which is the default when using DHCP). And if you don't manually change the domain name of clients or servers. And that the workgroup name matches on all clients and servers.
Check that the expected hostname of the NAS is shown in the FRITZ!Box, and also check that the SMB server name is the same as the hostname. Because with SMB the server name advertised to the network can be configured independently from the hostname so it isn't automatically constrained to match.
Without help from DNS, the way SMB service names (or NetBIOS Name Service - NBNS) are resolved is different and used to fall back on broadcasts (or used WINS in larger networks with multiple subnets).
If the NAS is not listed in the FRITZ!Box you can add a DHCP reservation matching its hostname, IP and MAC address, even if the NAS is configured manually.
I have an old HP Microserver acting as a NAS and FRITZ!Box resolves it even when the server is asleep or turned off.
In situations where you see a server listed more than once that can happen if it is discovered by multiple different services it is advertising, such as mDNS, SMB, even legacy AFP.
NAS are often setup to offer a given share by multiple methods.
Finally with Mac, Linux or Windows it is usually possible to save a bookmark or favourite in the sidebar of the file manager such that it connects when you click on it, which persists even if the server isn't advertising to computer browsing.
prlzx on Zen: FTTC (VDSL) at ~40Mbps / 10Mbps
with IP4/6 (no v6? - not true Internet)
Edited by prlzx (Tue 07-Mar-23 20:10:05)