no -a and tcp_keepint ?? Post: 302297594

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Operating Systems AIX no -a and tcp_keepint ?? Post 302297594 by bakunin on Friday 13th of March 2009 11:33:48 PM

03-14-2009

Registered User

In principle: a TCP connection is a so-called "virtual channel", think of it like a telephone call: you ring someone, he picks up the call - until one of you ends this call you are connected. The same principle applies to TCP: a connection is initiated, established and after some time removed. You can monitor all this with the "netstat" utility.

After some time an idle connection is removed automatically to preserve resources of the network stack. How long the system waits and how it determines what comprises an "idle" connection is subject of the parameters you asked for. Most of the values are seconds or milliseconds.

There is an arcane fountain of knowledge you could tap for more information called the "man pages". In this case the man pages of "no", which explain the parameters in painstaking detail. I suggest you read a good book about TCP/IP concepts and protocol mechanics (i always suggest W. Richard Stevens "TCP/IP Illustrated" and Andrew Tanenbaums "Computer Networks") first.

I hope this helps.

bakunin

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tcp-env

tcp-env(1)                                                    General Commands Manual                                                   tcp-env(1)

NAME

       tcp-env - set up TCP-related environment variables

SYNOPSIS

       tcp-env [ -rR ] [ -ttimeout ] program [ arg ...  ]

DESCRIPTION

       The  input  for  tcp-env  must be a TCP connection.  tcp-env finds out information about that connection, puts the information into several
       environment variables as described in tcp-environ(5), and runs program with the given arguments.

       Usually tcp-env is run from inetd.  It might instead be run from another server that already sets up the right  environment  variables;  if
       PROTO  is  set  to  TCP  when  tcp-env  is invoked, tcp-env assumes that all the other variables are set up properly, and it does not check
       whether the input is a TCP connection.

OPTIONS

       -r     (Default.)  Attempt to obtain TCPREMOTEINFO from the remote host.

       -R     Do not attempt to obtain TCPREMOTEINFO from the remote host.

       -ttimeout
              Give up on the TCPREMOTEINFO connection attempt after timeout seconds.  Default: 30.

SEE ALSO

       tcp-environ(5), inetd(8)

                                                                                                                                        tcp-env(1)