Is there a way to tell if a port # is open?

SurferdudeHBSurferdudeHB Member Posts: 199 ■■■□□□□□□□
in CCNA & CCENT
Just wondering if you can test that, thanks.
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  • hypnotoadhypnotoad Banned Posts: 915
    Yes. Assuming you're talking about a Windows machine, go to start > cmd > and type "netstat"
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  • maumercadomaumercado Member Posts: 163
    in a linux machine is netstat -ltpu or -lntpu

    the n is for number without n shows you the name of the service running!
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  • nelnel Member Posts: 2,859 ■□□□□□□□□□
    yep netstat -a
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  • TherhinoTherhino Member Posts: 122
    could always telnet to the port
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  • itdaddyitdaddy Member Posts: 2,089 ■■■■□□□□□□
    Better yet
    go to insecure.com and download the program n-M-a-p (nnnnnmap)
    and do a scan on your LAN's ip address and you can see allyour ports
    open
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  • networker050184networker050184 Mod Posts: 11,962 Mod
    If you are talking about on a Cisco router you can use "show ip sockets" on some devices and on others you can just use "show udp/tcp."
    An expert is a man who has made all the mistakes which can be made.
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  • itdaddyitdaddy Member Posts: 2,089 ■■■■□□□□□□
    I mean using N - Ma -p from a remote machine to the device.
    you can run n ma -p on your local machine..it just shows a nice
    list of what is going on...
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