Create a network Topology Setup in such a way so that System A can ping to two Systems => System B and System C but both these systems should not be pinging each other. without using any security rulee.g firewall etc.

Prerequisite:

• 3 VM(Virtual Machine).

Solution:

First, we need to delete all the IP addresses from all the OS routing tables. after that add the System A Ip in System B and System C routing table, at last, add the System B and System C Ip in System A routing table. huh, that’s simple 😅.

Step-1)Delete all the rules from all the Systems:

route del -net 192.168.0.0(IP_ADDRESS) gw 192.168.0.1(GATEWAY) netmask 255.255.255.0(NETMASK) enp0s3(NIC Card)

Deleting Rule in System A

Deleting Rule in System B

Deleting Rule in System B

Step-2)Adding IP address of System A in System B and System C routing table

• First of all, we need System A IP address.

System A IP address

• Now we need to add this IP in System B and System C

Adding an IP Address of System A in System B routing table

Adding an IP Address of System A in System C routing table

• Explanation: Here why I have used netmask 255.255.255.255 because it means to allow only one host i.e System A. Gateway 0.0.0.0 means has no gateway.

Step-3)Adding System B and System C IP address in the System A route table.

• We need to gather the IP addresses of System B and System C

System B Ip address

System C Ip address

• Now we need to add these IP addresses to the System A routing table.

Output

• Let’s ping the System.

System A pinging to System B

System A pinging to System C

System B pinging to System A

System C pinging to System A

• That’s great it's working 😃.
• Now let’s test connectivity to System B — System C

System B not able to ping System C

System C not able to ping System B

• That’s also great it is not working, why it is not working because we haven’t added the IP addresses of System B and System C to each other 😄.