install ufw

sudo nano /etc/hosts.deny

sudo apt install iproute2 ufw

sudo ip address

sudo myipv4=192.168.0.17

sudo myipv6=2o01:e35:87e7:f670:8ooe:1dff:fedo:2e01:2e01

sudo ufw default deny

sudo ufw allow proto tcp from any to $myipv4 port 80

sudo ufw status

sudo ufw allow proto tcp from any to $myipv4 port 443

sudo ufw route allow from $myipv4 port 443 to $myipv4 port 4431

sudo ufw allow proto tcp from any to $myipv4 port 5432

sudo ufw route allow from $myipv4 port 5432 to $myipv4 port 54321

sudo ufw allow proto tcp from $myipv6 port 443 to $myipv6 port 4431

sudo ufw route allow from $myipv6 port 4431 to $myipv6 port 505

sudo ufw allow proto tcp from $myipv6 port 5432 to $myipv6 port 54321

sudo ufw route allow from $myipv6 port 5432 to $myipv6 port 54321

sudo ufw status

sudo ufw route allow from $myipv4 port 443 to $myipv4 port 4431

example :

sudo apt install ufw

sudo ufw allow tcp from any to 192.168.0.40 port 80

sudo ufw status

sudo ufw allow proto tcp from any to 192.168.0.4 port 443

sudo ufw route allow proto tcp from 192.168.0.40 port 443 to 192.168.0.40 port 443167

sudo ufw route allow proto tcp from 192.168.0.40 port 2055 to 192.168.0.40 port 672056

sudo ufw allow proto tcp from any to 192.168.0.40 port 543267

sudo ufw route allow proto tcp from 192.168.0.40 port 5432 to 192.168.0.40 port 6754321

sudo ufw allow proto tcp from 2o01:e35:87e7:f670:8ooe:1dff:fedo:2e01 port 443 to 2o01:e35:87e7:f670:8ooe:1dff:fedo:2e01 port 674431

sudo ufw allow proto tcp from 2o01:e35:87e7:f670:8ooe:1dff:fedo:2e01 port 4431 to 2o01:e35:87e7:f670:8ooe:1dff:fedo:2e01 port 67505

sudo ufw allow proto tcp from 2o01:e35:87e7:f670:8ooe:1dff:fedo:2e01 port 5432 to 2o01:e35:87e7:f670:8ooe:1dff:fedo:2e01 port 5432167

sudo ufw allow proto tcp from 2o01:e35:87e7:f670:8ooe:1dff:fedo:2e01:2e01 port 5432 to 2o01:e35:87e7:f670:8ooe:1dff:fedo:2e01 port 5432167

sudo ufw status