1. I have installed two Linux6 OSs on virtual machine.
A. Server having ip=192.168.0.1 255.255.255.0 and hostname=server.com
B. Client having ip=192.168.0.2 255.255.255.0 and hostname=client.com
2. /etc/hosts made changes 192.168.0.1 server.com
192.168.0.2 client.com at both sides
3. On the virtual machine I selected as Bridged networking for both.

3.rpcbind and xnited is running iptables is disabled

But the question is server and client ping themselves, but not each other?
What is remaining?
when I ping client to server or server to client getting host unreachable

What's your virtual machine, vmware?

Gateway the same on both hosts?

Its vmware

Its vmware

Do you have one machine with two VMs or two machines each with their own VM?
What does the rest of your network look like? Is everything on the 192.168.0.x subnet, or are they on another subnet and 192.168.0.x is dedicated to these VMs?

one laptop->one VMware workstation -> two Linux os installed
Linux 1 I gave ip 192.168.0.1 ###.server.com
Linux 2 ip 192.168.0.2 ###.client.com

Hi,

As you have selected NAT as netwoking on both the instances it is not possible to ping each other.

If you want to ping client/server you should select Bridged networking or Internal networking

Reference https://www.virtualbox.org/manual/ch06.html

He did select bridged networking, it says so in the OP. I'm not sure where you saw that he was running NAT.

And what about the rest of the network?

I assume like. One VNware workstation is host and two Linux OS is guest. That means you request communication between host and guest.
The VMCI need be enabled to allow communication.