Linux Security: ssh keygen

[satya61229]

Someone is accessing my system.
Dump from ~/.ssh/known_hosts
192.168.0.88 ssh-rsa
192.168.0.92 ssh-rsa
192.168.0.101 ssh-rsa
192.168.0.78 ssh-rsa
192.168.0.60 ssh-rsa
192.168.0.91 ssh-rsa
192.168.0.108 ssh-rsa
192.168.0.112 ssh-rsa
192.168.0.246 ssh-rsa
satya ssh-rsa

Is it wrong. My system name is satya. but I come to know that same username can be used. other is 192... so it can be used for local net. Is that required also?

And tell about "satya ssh-rsa".

Please comment.

I have added ALL:ALL in hosts.deny file. I think it is enough for denying ssh connection. But still I am in trouble. And where is the log for ssh-rsa connection.
Thanks you.

[Motoma]

This is not people accessing your system, it is you accessing other systems.

Your known hosts file is a list of servers that you have connected to. Whenever you connect to a new server, you get a message about whether or not you want to add it to the list. Responding yes places it in the known_hosts file.

[satya61229]

This is not people accessing your system, it is you accessing other systems.

Your known hosts file is a list of servers that you have connected to. Whenever you connect to a new server, you get a message about whether or not you want to add it to the list. Responding yes places it in the known_hosts file.

Oh! Really.
Very important info for me.
Probabbly it is the host for testing server etc.

I have added ALL:ALL to my hosts.deny and in /log/secure file it show something like this:

Mar 30 20:35:28 satya sshd[1731]: Received signal 15; terminating.
Mar 31 11:59:00 satya sshd[1735]: Server listening on :: port 22.
Mar 31 11:59:00 satya sshd[1735]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use.
Mar 31 12:05:38 satya sshd[1735]: Received signal 15; terminating.
Mar 31 12:06:48 satya sshd[1728]: Server listening on :: port 22.
Mar 31 12:06:48 satya sshd[1728]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use.

And it looks no one is able to connect to my system.