I need a simple utility that allow me to check if a PC, attached to a local network, is able to reach a specified address:port using specified protocol like TCP or UDP
Machine's OS I will use to do the check is Windows XP.
I need a simple utility that allow me to check if a PC, attached to a local network, is able to reach a specified address:port using specified protocol like TCP or UDP
Machine's OS I will use to do the check is Windows XP.
Use simply telnet
:
telnet hostname port
If you get a connection, something replies on that port.
If you get an error message, no program is listening on that port, or the hostname is invalid:
Connecting To hostname...Could not open connection to the
host, on port <port>: Connect failed
You can use iperf to check if UDP ports are reachable or not.
Example: Testing if port 5093 UDP is open on remote server 10.0.0.1
C:\>iperf -u -p 5093 -c 10.0.0.1
------------------------------------------------------------
Client connecting to 10.0.0.1, UDP port 5093
Sending 1470 byte datagrams
UDP buffer size: 8.00 KByte (default)
------------------------------------------------------------
[320] local 10.16.61.182 port 54574 connected with 10.0.0.1 port 5093
[ ID] Interval Transfer Bandwidth
[320] 0.0-10.0 sec 1.25 MBytes 1.05 Mbits/sec
[320] **Sent 893 datagrams**
As you can see the client successfully transferred 893 datagrams meaning the port is open indeed. In case the firewall was blocking the port, you should read a message like this:
Read failed: Connection reset by peer