I can't ping tower from any host in my network either.
@EGOvorhuk
I'm a little confused by your test. My networking knowledge is admittedly limited. If you set a static IP in the web GUI but don't reserve that IP in your DHCP server, should your router know about it? It's not clear to me that the behavior you're seeing is unexpected. Can anyone educate me on this?
Also, when I reboot (using DHCP for IP assignment) I see Tower in my device list and it is pingable via tower.local at first. After a little while (not sure how long exactly--5 to 30 minutes, maybe?) tower.local becomes unpingable.