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Port forwarding and nmap.

  • 22-05-2007 7:44am
    #1
    workaccount
    Closed Accounts Posts: 2,460 ✭✭✭


    At the moment we are using a dsl router with port forwarding setup to terminal service into machines etc.

    Things like 443 and 25 are port forwared as well as 3389.

    Im just trying to see what it would like like to a scanner outside so I just ran a portscan with nmap. Its doesn't give me any results though on the forwarded ports. How is this?


Comments

  • #2
    Martyr
    Closed Accounts Posts: 1,567 ✭✭✭Martyr


    good question, i would guess the router only forwards requests to internal ip addresses for the ports you mention (not open on router)
    there probably is a tool to discover if those ports are being forwarded, hping maybe.somebody knows hehe :)


  • #3
    koloughlin
    Closed Accounts Posts: 97 ✭✭koloughlin


    workaccount wrote:
    At the moment we are using a dsl router with port forwarding setup to terminal service into machines etc.

    Things like 443 and 25 are port forwared as well as 3389.

    Im just trying to see what it would like like to a scanner outside so I just ran a portscan with nmap. Its doesn't give me any results though on the forwarded ports. How is this?

    Did you run nmap from inside your network? More than likely the port forwarding is only active on your external IP address so you may not see it from inside your network. Try running nmap from a friend's ip/work/internet cafe etc. against your external IP. Another option is to go here https://www.grc.com/x/ne.dll?bh0bkyd2 and run their test. You'll have to run a special test for the remote desktop port since Gibson's test only does up to 1024 or thereabouts.

    By the way consider tunneling your remote desktop traffic over ssh (like described here http://knowledge.twocell.com/index.php?title=Secure_Remote_Desktop_with_Cygwin_and_SSHD) rather than having the port open. You can use compression and encryption and probably make your setup a good bit more secure.


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