ssh
StrictHostKeyChecking no
Host 192.168.0.* StrictHostKeyChecking no UserKnownHostsFile=/dev/null
http://d.hatena.ne.jp/yohei-a/20100214/1266112027
http://superuser.com/questions/125324/how-can-i-avoid-sshs-host-verification-for-known-hosts
http://linuxcommando.blogspot.jp/2008/10/how-to-disable-ssh-host-key-checking.html