etc/ssh/ssh_config

   1 Host *
   2         #Compression yes
   3         #CompressionLevel 9
   4         #ControlMaster auto
   5         #ControlPath ~/var/run/ssh/sock/%h-%p-%r
   6         GSSAPIAuthentication no
   7         GSSAPIDelegateCredentials no
   8         HashKnownHosts yes
   9         IdentityFile ~/etc/ssh/id_dsa
  10         IdentityFile ~/etc/ssh/id_rsa
  11         IdentityFile ~/etc/ssh/identity
  12         SendEnv LANG LC_*
  13         StrictHostKeyChecking ask
  14         UserKnownHostsFile ~/etc/ssh/known_hosts