We wish to bypass the known_host file when we connect to the remote host. One way to do that is to set the SrictKeyHostChecking to no and you will not be prompted with any message everytime you connect to the system.
If you login to remotehost , an entry will be made to known_host and if you reinstall the new host , and then try to re-connect to remote host again , since known_host already has the old key for the remotehost , it again give the warning message saying that Key is changed. So here the StrictHost option is not working here.

Can we avoid the warning message in this scenario or Any way we can bypass the known_host file itself.

Please suggest.

sachinh, I don't know what exactly you are up to, but it must stop. First, you vandalized a thread. Then, you opened a new one (and you are already receiving help there). Why on Earth would you need to open up yet another one to ask the same question when you have a perfectly good thread going already? Your actions aren't making any sense at all.