10-23-2001
The usual reason for asking this question is that you want to restart a server but can't because you get a message "can't bind to port". There are adb scripts to close a FIN_WAIT_2 socket, I don't understand why you're having trouble with it. HP also has a program called ndd which can close a connection. But you shouldn't have to do this. Instead you address the real problem which is that the server has a bug that should be fixed.
There are two ways to ignore FIN_WAIT_2 sockets under unix. First, a program like inetd can do the bind at boot-up time and pass off new connections to the server as they arrive. Second, the server can simply set the SO_REUSEADDR option to indicate that it would prefer to ignore them.
You must have a server that does not want to run under inetd and it doesn't set SO_REUSEADDR. Ask whoever wrote the server to fix that. It takes one line of code to set SO_REUSEADDR and then you will have no more problem.
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REDIR(1) General Commands Manual REDIR(1)
NAME
redir - redirect tcp connections
SYNOPSIS
redir [--laddr=incoming.ip.address] [--caddr=host] [--debug] [--syslog] [--name=str] [--timeout=n] [--bind_addr=my.other.ip.address] [--ftp=type]
[--transproxy] [--connect=host:port] --lport=port --cport=port [--bufsize=n] [--max_bandwidth=n] [--random_wait=n] [--wait_in_out=n]
redir --inetd [--caddr=host] [--debug] [--syslog] [--name=str] [--timeout=n] [--ftp=type] [--transproxy] [--connect=host:port] --cport=port
[--bufsize=n] [--max_bandwidth=n] [--random_wait=n] [--wait_in_out=n]
DESCRIPTION
Redir redirects tcp connections coming in to a local port to a specified address/port combination.
It may be run either from inetd or as a standalone daemon. Depending on how redir was compiled, not all options may be available.
OPTIONS
--lport
Specifies port to listen for connections on (when not running from inetd)
--laddr
IP address to bind to when listening for connections (when not running from inetd)
--cport
Specifies port to connect to.
--caddr
Specifies remote host to connect to. (localhost if omitted)
--inetd
Run as a process started from inetd, with the connection passed as stdin and stdout on startup.
--debug
Write debug output to stderr or syslog.
--name Specify program name to be used for TCP wrapper checks and syslog logging.
--timeout
Timeout and close the connection after n seconds of inactivity.
--syslog
Log information to syslog.
--bind_addr
Forces redir to pick a specific address/interface to bind to when it listens for incoming connections.
--ftp When using redir for an FTP server, this will cause redir to also redirect ftp connections. Type should be specified as
either "port", "pasv", or "both", to specify what type of FTP connection to handle. Note that --transproxy often makes one
or the other (generally port) undesirable.
--transproxy
On a linux system with transparent proxying enabled, causes redir to make connections appear as if they had come from their
true origin. (see /usr/share/doc/redir/transproxy.txt)
--connect
Redirects connections through an HTTP proxy which supports the CONNECT command. Specify the address and port of the proxy
using --caddr and --cport. --connect requires the hostname and port which the HTTP proxy will be asked to connect to.
--bufsize n
Set the bufsize (defaut 4096) in bytes. Can be used combined with --max_bandwidth or --random_wait to simulate a slow con-
nection.
--max_bandwidth n
Reduce the bandwidth to be no more than n bits/sec. The algorithme is basic, the goal is to simulate a slow connection, so
there is no pic acceptance.
--random_wait n
Wait between 0 and 2 x n milliseconds before each "packet". A "packet" is a bloc of data read in one time by redir. A
"packet" size is always less than the bufsize (see also --bufsize).
--wait_in_out n
Apply --max_bandwidth and --random_wait for input if n=1, output if n=2 and both if n=3.
SEE ALSO
inetd(1)
local REDIR(1)