08-19-2008
TCP status question
There is a server and a client,when client send a message to server,server can send a reply to client. The status of server and client is ESTABLISHED.Then I halt the client,I find the server status is CLOSE_WAIT and the client status is FIN_WAIT_2. Many minutes passed,I find the the server status still is CLOSE_WAIT and the client status still is FIN_WAIT_2. Why the status of server and client isn't CLOSED? Anybody could tell me the reason? I am puzzled with TCP status for a very long time.
Thanks
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statd(1M) statd(1M)
NAME
statd, rpc.statd - network status monitor
SYNOPSIS
DESCRIPTION
is an RPC server. It interacts with to provide the crash and recovery functions for the locking services on NFS (see lockd(1M)).
keeps track of the clients with processes which hold locks on a server. When the server reboots after a crash, sends a message to the on
each client indicating that the server has rebooted. The client processes then informs the on the client that the server has rebooted.
The client then attempts to reclaim the lock(s) from the server.
on the client host also informs the on the server(s) holding locks for the client when the client has rebooted. In this case, the on the
server informs its that all locks held by the rebooting client should be released, allowing other processes to lock those files.
Options
recognizes the following options and command-line arguments:
This is an obsolete option. All messages and errors are logged to
WARNINGS
The crash of a server is only detected upon its recovery.
FILES
lists hosts and network addresses to be contacted after a reboot
lists hosts and network addresses that could not be contacted after last reboot
includes a number which changes during a reboot
AUTHOR
was developed by Sun Microsystems, Inc.
SEE ALSO
lockd(1M), fcntl(2), lockf(2), signal(2), sm(4).
statd(1M)