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zZyXx

Member

Registered: 2008-06-26

Posts: 7

[solved] cli tool that repeatedly checks a host on a specified port

can anyone recommend a command line tool that repeatedly checks a host on a specified tcp port?

what i do now:
- I reboot a server
- I ping the host; when I see it replies, I know its networking is up
- I use "nmap -PN -p 25 host" from time to time to check when the smtp service comes up

I'm looking for a tool that does this port check repeatedly, like ping repeatedly checks for icmp echo replies...

Last edited by zZyXx (2010-03-29 13:56:30)

evol

Member

From: Ireland

Registered: 2007-06-27

Posts: 53

Website

Re: [solved] cli tool that repeatedly checks a host on a specified port

would "watch" suffice for your needs?

watch -n 60 nmap -PN -p 25 xx.xx.xx.xx

Where 60 is however many seconds you want to wait before repeating.

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zZyXx

Member

Registered: 2008-06-26

Posts: 7

Re: [solved] cli tool that repeatedly checks a host on a specified port

thanks. that should provide the desired functionality. I was looking for another tool because for some reason nmap takes a few seconds on this machine. I remembered reading about some tool that provided the functionality I described.
I found it again: it was nping, a new development related to nmap, still alpha however...
http://nmap.org/nping/

jamesbond007

Member

From: Germany

Registered: 2009-06-14

Posts: 150

Re: [solved] cli tool that repeatedly checks a host on a specified port

What about this?

watch netcat -vz -w 1 <ip> 25