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Full Discussion: TCP status question
Top Forums Programming TCP status question Post 302226765 by chihung on Tuesday 19th of August 2008 08:45:15 PM
Old 08-19-2008
I am no expert in TCP, but I know that if you 'abort' your client, the server is doing a 'passive close' and the server will go into 'CLOSE_WAIT' state. The time interval for close_wait will depend on the system.

In Solaris, you can find out all these time interval settings
Code:
$ for i in `ndd /dev/tcp \? | awk '/interval/{print $1}'`
  do
  echo "$i=`ndd /dev/tcp $i`"
  done
tcp_time_wait_interval=60000
tcp_ip_abort_cinterval=180000
tcp_ip_abort_linterval=180000
tcp_ip_abort_interval=480000
tcp_ip_notify_cinterval=10000
tcp_ip_notify_interval=10000
tcp_keepalive_interval=7200000
tcp_rexmit_interval_initial=3000
tcp_rexmit_interval_max=60000
tcp_rexmit_interval_min=400
tcp_deferred_ack_interval=100
tcp_fin_wait_2_flush_interval=675000
tcp_rexmit_interval_extra=0
tcp_co_timer_interval=20
tcp_local_dack_interval=50
tcp_ndd_get_info_interval=1000
tcp_push_timer_interval=50
tcp_close_wait_interval(obsoleted-=name is non-existent for this module
for a list of valid names, use name '?'

Recently I talked about the TIME_WAIT in my blog.
Chi Hung Chan: Lots of TIME_WAIT in Your Netstat
See the attached TCP state diagram to understand the relationship of various states.
 

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LEARN ABOUT REDHAT

netdump

NETDUMP-CLIENT(8)						  System Programs						 NETDUMP-CLIENT(8)

NAME

       netdump - send oops data and memory dumps over the network

SYNOPSIS

       /etc/init.d/netdump (start|stop|status|restart|propagate)

DESCRIPTION

       Loads and configures the netdump kernel modules. Once these are loaded, when the kernel crashes it will send the oops message and a dump of
       physical memory to the machine that runs the netdump-server. This can then be used to debug the problem using gdb and a kernel image.

OPTIONS

       start  Starts the netdump client service. Loads the kernel modules with the right options.

       stop   Unloads the kernel modules.

       status Shows the status of the netdump client

       restart
	      Restarts the netclient modules with new configurations.

       propagate
	      Sends the ssh public key needed to update the random key for each netdump session to the netdump server.

FILES

       /etc/sysconfig/netdump
	      Configuration for the netdump client. You need to at least specify the address of the machine running the netdump server here.

       /etc/sysconfig/netdump_id_dsa.pub
	      Public key for this machine. Used by the server to authenticate the client.  This must be installed on the server, possibly by using
	      the the propagate capability of the netdump init script, which does:
	      cat /etc/sysconfig/netdump_id_dsa.pu | ssh netdump@$NETDUMPADDR cat '>>' /var/crash/.ssh/authorized_keys2
	      Where $NETDUMPADDR is the ip or name of the machine running the netdump server.

SEE ALSO

       netdump-server(8), init(8)

BUGS

       Report any bugs you find to http://bugzilla.redhat.com/bugzilla

AUTHOR

       Alexander Larsson <alexl@redhat.com>

Linux								    14 Feb 2002 						 NETDUMP-CLIENT(8)
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