I have suddenly started getting lots of messages like the following in my /var/log/messages:-
Aug 5 06:59:01 home sshd[7886]: Connection from 193.128.168.195 port 63433 Aug 5 07:14:02 home sshd[7890]: Connection from 193.128.168.195 port 63995 Aug 5 07:29:01 home sshd[7893]: Connection from 193.128.168.195 port 64515 Aug 5 07:44:01 home sshd[2451]: Generating new 768 bit RSA key. Aug 5 07:44:01 home sshd[2451]: RSA key generation complete. Aug 5 07:44:02 home sshd[7897]: Connection from 193.128.168.195 port 65110
I can't see any other activity as a result, no attempted logins or odd processes running. Should I be worried? The IP address 193.128.168.195 seems to be unidentified.
I get the occasional login attempt from other places but these are fairly obvious and my passwords are close to unguessable so they don't worry me too much.