Static IP for Sophos Firewall

Question

Hello dear community! I would like to clarify few dummy things. 
 During configuring my terminal station into firewall router (steps as per 'tutorial': https://www.youtube.com/watch?v=YGR9_kmPlig&t=451s ) I've encountered issue as was unable to connect to 172.16.16.16:4444 
 Investigating topic I've discovered that my network service provider do not support static IP addresses as: 
 IP addresses for Netia's internet services are dynamically assigned. 
This means that even each disconnection will result in the assignment of a different (currently free) IP address from a specific address pool.

Entering the configuration manually is unnecessary and at the same time impossible,
because the address assigned from Netia has a shortened /32 mask (255.255.255.255), i.e. it is one host address, not a subnet. 
 
 From my newbie understanding when I turning off DHCP server I will need static IP address to access web and because I am unable to use one I cannot access 172.16.16.16:4444. I can obtain static IP from my network service provider but before doing so I would like to somehow confirm that is the root cause. Please share yours thoughts and confirm if obtaining static IP from NSP is a good step forward.

rfcat_vk · Answer

Hi, 
 you are confusing two issues. 
 1/. The IP address you are quoting is for your internal network and uses aDHCP server to assign addresses to connecting devices. 
 2/. The WAN interface can have either static or dynamic addressing. You will disable the DHCP function on your wan interfaces when you click assign static address. 
 3/. the servers on each interface are independent in the default setup. 
 Ian