10-21-2010
Many tcp listeners can be made to respond using telnet. I am not talking about logging in, telnet is just a trivial, general tcp client with some optional behaviors. Telnet to a web server port 80 and type 'GET / HTTP/1.0'+CR+CR. If you telnet to most servers, and they do not respond, still you know they are really listening, even if you do not know the magic bytes to make them talk. For instance, if inetd is the real listener, and the app is missing/crashing, the connection may take for an instant and they be broken off.
Make a file of good netstat -an listen lines and comm them to see if any disappeared.
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LEARN ABOUT DEBIAN
vdetelweb
VDETELWEB(1) General Commands Manual VDETELWEB(1)
NAME
vdetelweb - Virtual Distributed Ethernet Telnet and/or Web management module
SYNOPSIS
vdetelweb [ --web ] [ --telnet ] [ --nodename nodename ] [ --daemon ] [ --rcfile rcfile ] mgmt_socket
DESCRIPTION
vdetelweb implements a tiny telnet server and/or a tiny web server for the remote management of a VDE2 switch.
OPTIONS
-w, --web
start the web server. At least one of --web or --telnet must be set.
-t, --telnet
start the telnet server. At least one of --web or --telnet must be set.
-n, --nodename nodename
specify the nodename as seen from remote connections (e.g. in the command prompt or in the web page title). uname nodename is used
when this option is not specified.
-d, --daemon
run as a daemon, using syslog for logging.
-f, --rcfile rcfile
rc file to set the initial switch configuration. When not specified, vdetelweb searches for ~/.vde/vdetelwebrc and /etc/vde/vdetel-
webrc. At leas one rc file must exist and be readable.
-h, --help
print help. please use it for a more complete list of options.
mgmt_socket
is the managemnt socket used to communicate with the vde_switch. (This option must match the path used in the -M option for the
vde_switch).
NOTICE
Virtual Distributed Ethernet is not related in any way with www.vde.com ("Verband der Elektrotechnik, Elektronik und Informationstechnik"
i.e. the German "Association for Electrical, Electronic & Information Technologies").
SEE ALSO
vde_switch(1), vde_plug(1), vdeq(1). dpipe(1). unixterm(1).
AUTHOR
VDE is a project by Renzo Davoli <renzo@cs.unibo.it>
Virtual Distributed Ethernet June 16, 2008 VDETELWEB(1)