changed the default "keepalive" value to 300 seconds.

This is more important now that oplocks are being used.

docs/manpages/smb.conf.5

@@ -1666,13 +1666,8 @@ between 'keepalive' packets. If this parameter is zero, no keepalive packets
 will be sent. Keepalive packets, if sent, allow the server to tell whether a
 client is still present and responding.
 
-Keepalives should, in general, not be needed if the socket being used
-has the SO_KEEPALIVE attribute set on it (see "socket
-options"). Basically you should only use this option if you strike
-difficulties.
-
 .B Default:
- 	keep alive = 0
+ 	keep alive = 300
 
 .B Example:
  	keep alive = 60

source/include/local.h

@@ -159,6 +159,8 @@
 #define LONG_CONNECT_TIMEOUT 30
 #define SHORT_CONNECT_TIMEOUT 5
 
+/* the default netbios keepalive timeout */
+#define DEFAULT_KEEPALIVE 300
 
 /* the directory to sit in when idle */
 /* #define IDLE_DIR "/" */

source/param/loadparm.c

@@ -89,7 +89,7 @@ extern pstring myname;
 #define LP_SNUM_OK(iService) (((iService) >= 0) && ((iService) < iNumServices) && iSERVICE(iService).valid)
 #define VALID(i) iSERVICE(i).valid
 
-int keepalive=0;
+int keepalive=DEFAULT_KEEPALIVE;
 extern BOOL use_getwd_cache;
 
 extern int extra_time_offset;