Hide/Undetected PfSense

Hi all,

just a stupid question but I need to know if is possible,

Anyone have any clue if we can hide a pfSense firewall in the next scenario ?!

Internet (WAN) in regular Router - 192.168.5.1 and from that Router is shared with some internal Computers/CCTV/VoIP. What I want is to connect to that Router with a pfSense box and I will have another IP class for example 192.168.20.0/24 for LAN, and pfSense WAN will be 192.168.5.100.

And now I want somehow from 192.168.5.0/24 or another VLANs my pfSense box to be undetected if someone tries any Network Tools to search the alive IPs and to be restricted via HTTP/HTTPS access to the pfSense.

thanks,
Alex

you can turn off ping on the WAN, but the traffic that flows across the network from 192.168.5.100 to 192.168.5.1 can still be viewed

Question what is the importance of trying to have it undetected? Is there a deeper purpose other than curiosity?