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Looking at nmap documentation, you will find the following statements (emphasis added): If none of these host discovery techniques are chosen, Nmap uses a default which is equivalent to the -PE -PS443 -PA80 -PP arguments for Windows or privileged (root) Unix users. Attentive readers know that this means an ICMP echo request, a TCP SYN packet, a TCP ACK ...


Problem was on Server, it has changed default gateway and unfortunately it also has routing configured. Therefore communication happened for one way.


It's called static routing. Here is an example of how it works: "mine having a private address of" "other LAN PC having a private address of say" Add the following configuration to your router protocols [ static [ route [ next-hop [ ] ] ] ] From your ...

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