[hobbit] UDP Port Testing

[Jeff Stuart]

Henrik Stoerner wrote:
> On Thu, Nov 24, 2005 at 12:09:02AM -0500, Jeff Stuart wrote:
>   
>> Does anyone know of a plugin (or a way) to test a UDP port?  Yes, I know
>> that may sound strange (IE UDP IS stateless) but I need to be able to
>> basically test if a port responds or not. 
>>     
>
> Since there's no handshake in UDP, there is no general way of testing
> a random UDP port like you can with TCP. What you *can* do is send a
> packet to the UDP port, and see if you get an ICMP error message back - 
> if you do, then you can safely assume that there is no service running
> on that port.
>
> The problem is that in many cases you just won't get a reply, in which
> case you cannot tell for sure if there is a service running or not.
>
> You can run the nmap port scanner in UDP mode and see what is says, but
> the only really sure way of testing a UDP port is to talk to the service
> that is supposed to run there, and see if any sensible response comes
> back to you.
>
>
> Regards,
>
> Henrik
Yeah, thx Henrik.. ;)  Kinda what I figured... ahh well... time to write
my qstat plugin then. :D

-- 
Jeff Stuart
Network Admin 
MyInternetServices.com
1-800-300-HOST



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