What to do with a constant flow of attempts to login to my compuet?

[Gabor Szabo]

I just noticed someone bombarding my machine trying to login via ssh.
>From auth.log

Jan  3 06:31:48 s6 sshd[22774]: Failed password for invalid user
amavisd from 202.138.142.216 port 35172 ssh2
Jan  3 06:31:48 s6 sshd[22773]: Failed password for invalid user
clamav from 202.138.142.216 port 39941 ssh2
Jan  3 06:31:49 s6 sshd[22780]: Invalid user clamav from 202.138.142.216
Jan  3 06:31:49 s6 sshd[22780]: pam_unix(sshd:auth): check pass; user unknown
Jan  3 06:31:49 s6 sshd[22780]: pam_unix(sshd:auth): authentication
failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=202.138.142.216
Jan  3 06:31:49 s6 sshd[22781]: Invalid user appserver from 202.138.142.216
Jan  3 06:31:49 s6 sshd[22781]: pam_unix(sshd:auth): check pass; user unknown
Jan  3 06:31:49 s6 sshd[22781]: pam_unix(sshd:auth): authentication
failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=202.138.142.216
Jan  3 06:31:52 s6 sshd[22780]: Failed password for invalid user
clamav from 202.138.142.216 port 35699 ssh2
Jan  3 06:31:52 s6 sshd[22781]: Failed password for invalid user
appserver from 202.138.142.216 port 40470 ssh2


So what is your suggestion. What to do with it?

Gabor