I don't know which parameters you tried but
sudo nmap -sS -sU -T5 -A -v 192.168.1.0/24
usually does the trick. Remember this will take some time and will be noisy because of the
-T5 flag but its your network, so happy hunting.
You can use other tools like
xprobe2 192.168.0.1 and
nikto on github
xprobe2 on sourceforge
Compile from source to use in either linux or windows
Here is a simple example of snmp reconnaissance hack-like-pro-exploit-snmp-for-reconnaissance-0150181
For OS foot-printing and if you are interested you can look into snmp hacking to gather info from a client server environment.
There are tools like
snmpwalk which are very easy to use.
There are other ways for foot-printing CEH heavy stuff which needs studying and hands on practice, but in your scenario I don't think that’s worth the time.