How to scan (or) listen all connection ?

[devi3000]

Dear All,

I would like to develop a network tools for my company.

That contain the feature that is tool can be scan or listen
all connection establish.

can be scan Application ID, connect IP and port..

Like Proxifier.


Thanks

[sessi4ml]

Hmmm, write a program that pings all IPs?
Read your own IP...then ping all others.
If the ping returns, you have something: PC, Router, printer, ?
Just a thought.

[DigiRev]

You can use the netstat command to get all established connections for TCP and UDP, or either one seperately.

I'm not sure how to get the application name for each connection though, but I'm pretty sure it can be done.

[TokersBall_CDXX]

XP+ systems

Displays protocol statistics and current TCP/IP network connections.

NETSTAT [-a] [-b] [-e] [-n] [-o] [-p proto] [-r] [-s] [-v] [interval]

  -a            Displays all connections and listening ports.
  -b            Displays the executable involved in creating each connection or
                listening port. In some cases well-known executables host
                multiple independent components, and in these cases the
                sequence of components involved in creating the connection
                or listening port is displayed. In this case the executable
                name is in [] at the bottom, on top is the component it called,
                and so forth until TCP/IP was reached. Note that this option
                can be time-consuming and will fail unless you have sufficient
                permissions.
  -e            Displays Ethernet statistics. This may be combined with the -s
                option.
  -n            Displays addresses and port numbers in numerical form.
  -o            Displays the owning process ID associated with each connection.
  -p proto      Shows connections for the protocol specified by proto; proto
                may be any of: TCP, UDP, TCPv6, or UDPv6.  If used with the -s
                option to display per-protocol statistics, proto may be any of:
                IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, or UDPv6.
  -r            Displays the routing table.
  -s            Displays per-protocol statistics.  By default, statistics are
                shown for IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, and UDPv6;
                the -p option may be used to specify a subset of the default.
  -v            When used in conjunction with -b, will display sequence of
                components involved in creating the connection or listening
                port for all executables.
  interval      Redisplays selected statistics, pausing interval seconds
                between each display.  Press CTRL+C to stop redisplaying
                statistics.  If omitted, netstat will print the current
                configuration information once.

[DigiRev]

You can use this code to properly get the output of the command prompt. As opposed to using: netstat > C:\output.txt

The commands would be:

For TCP:
netstat -banp tcp

For UDP:
netstat -banp udp

For both:
netstat -b

I think that's right.

Hope it works.