is it possible to set a static dns entry and use it for machines?
So i can ping dns entry from router and i get my ip, but i cant ping that static ip dns name from another machine?
It’s possible, but those machines have to use this router as their only DNS resolver, you can’t mix it with other resolvers.
There could also be problems if the entry is not FQDN, i.e. when it’s just “somename” instead of “somename.somedomain”, because machines may try to attach some suffix and ask for different name that router doesn’t have.