  /etc/ssh/sshd_config

   /etc/ssh/sshd_config  , -
   ,    ,  
      .

 AllowUsers -.  - -
    ,   ,
       sshd.    -
  *  ?.       
^ .      ,   -
  ,    hostname.     -
,      ,        -
 OpenSSH.

 ClientAliveInterval .          -
,     . . ClientAliveCountMax. 
  0,      .
         
 IP- (. ).     KeepAlive, 
 TCP- keepalive    IP-.

 ClientAliveCountMax .      -
 ,         , 
sshd   . . ClientAliveInterval.   -
  3.

 HostbasedAuthentication yes | no.    yes,   -
 rhosts.        
( ).

 IgnoreRhosts yes | no.   .rhosts  .shosts  .
       /etc/hosts.equiv 
/etc/ssh/shosts.equiv.        (
).

 KeepAlive yes | no.  ,   , 
 yes ( ).   ,   ssh 
scp           
,      .      -
 ,     .
   TCP- keepalive,     -
  IP- (. ).     
  "ClientAliveInterval"  "  /ete/ssh/sshd_config"
 .

 LoginGraceTime .       ,  -
   .  0 ,    .  
 120.

 LogLevel .     . 

  QUIET, FATAL, ERROR, INFO  VERBOSE.    INFO.

598  V.     