Host old-rhel5                                                                                                                                                                                                
  Hostname 192.168.1.20                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
  KexAlgorithms +diffie-hellman-group1-sha1,diffie-hellman-group14-sha1                                                                                                                                          
  HostKeyAlgorithms +ssh-rsa                                                                                                                                                                                     
  PubkeyAcceptedKeyTypes +ssh-rsa