SSH hank attempts… bad?

Wade Preston Shearer lists at
Tue Apr 11 20:55:56 MDT 2006

My server can get up ~12,000 [1] failed log in attempts recorded in  
my server's logs in one day. How much of a concern should this be? I  
am aware of restricting shell access to certain IPs. Will that  
restrict the handshake or will I still see the attempts in my logs?  
Are there any ways to restrict the attempts?

[1] Generally, ~3-20 on against standard system accounts (root, news,  
squid, apache, etc), ~5,000 against unknown, and ~12,000 against  
"unmated entries."

Wade Preston Shearer

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