Entries in /var/log/messages

[geisj at pagestation.com (Jerry Geis)]

I have quite a few entries in /var/log/messages for connection attempts. 
Is there anything other
than ignoring them I can do? Example is below.

Aug 21 15:48:19 machine sshd(pam_unix)[17903]: check pass; user unknown
Aug 21 15:48:19 machine sshd(pam_unix)[17903]: authentication failure; 
logname= uid=0 euid=0 tty=ssh ruser=
rhost=wsip-24-234-149-156.lv.lv.cox.net

THanks,

Jerry