How do I find out which ports are open on my network?

Issue by DPUCCIO: How do I discover out which ports are open on my network?
I am trying to use port forwarding to view safety cameras over the net. My digital camera technique, making use of DHCP, has an IP deal with of 192.168..a hundred. The info is set to come out of port 1026. The camera system is plugged into a hub with an IP address of 192.168..one (set statically). That hub is, in turn, plugged into a DSL modem (which can also function as a Wireless Hub/DHCP server) with the internal deal with of 192.168..2 and an exterior tackle of 71.38.68.47. Internally, I can see all gadgets on the network whether or not I am plugged into the hub or have linked to the wireless modem. I have set port forwarding on the DSL modem to forward 192.168..100 port 1026 for equally TCP and UDP protocols. It seems like I have accomplished every little thing right. I have set-up a similar arrangement in the past with good results. But presently, I are unable to call the WAN IP tackle of the modem : port quantity of the cameras and get the photo. Perhaps it is in how the modem and wired hup are connected. Value any help.


Best solution:

Reply by nicey_zzzz
On the *nix box in question sort:
netstat -anp | grep Listen

and it'll display you all the open ports.

From yet another box use the nmap system (locate on Yahoo! lookup) to scan for open ports on your boxes.

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