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 Today, we will create a topology such that there will be 3 systems  System A <-----------------> System B <-----------------> System C But System A and C can't connect. This can be done by assigning A and C different networks and B will have networks containing both networks of A and C.  The generation of packets depends upon the rules written in the routing table.  Lets assign Ip 192.168.1.1 to B with netmask of 255.255.0.0, It will conatain ips from 192.168.0.0 - 192.168.255.255 and System A will get ip 192.168.1.5 with netmask 255.255.255.252 and System C will get ip 192.168.2.5 with netmask 255.255.255.252. Both will contain only 4ips.  Ip can be set by commands  For B ifconfig enp0s3 192.168.1.1/16 For A ifconfig enp0s3 192.168.1.5/30 For C ifconfig enp0s3 192.168.2.5/30 Rules can be added by commands  For B route add -net 192.168.0.0/16 enp0s3 For A route add -net 192.168.1.0/30 enp0s3 For C route add -net 192.168.1.0/30 enp0s3 Lets ...

 Today we will create a setup so that we can ping to google but not facebook by using networking concepts and not a firewall. First, let's see our routing table by command  route -n Currently, we can ping to both google.com and facebook.com Here, -c refers to the number of counts of ping. Now, we will delete the rule that allows us to connect to the internet by command  route del -net 0.0.0.0 Now, we will add a new rule that only allow google to connect. Now, let's try to ping both again Facebook Failed Google Success   Thank You  for reading. I would like to thanks  Vimal Daga  Sir. ( https://www.linkedin.com/in/vimaldaga/ ) My Email — ayanchawlae@gmail.com My LinkedIn —   https://www.linkedin.com/in/ayanchawlae/