check_udp error message

[Andreas Ericsson]

On 2013-09-03 12:33, Marco Borsani wrote:
> Hi all
>
> I need to control many UDP ports.
>
>
>
> I run the command:
>
> ./check_udp –H <IP_ADDRESS> –p 88
>
>
>
> I receive following error message (with state UNKNOWN) :
>
> With UDP checks, a send/expect string must be specified
>
>
>
> Can anyone help me to solve it?
>
> Those parameters should be optional..
>

UDP is a connection-less protocol. The "expect" string could indeed
be optional, and we could just expect to get something at all back
when we send something, but without sending anything we won't even
touch the network, so the remote host has no idea that we're trying
to talk to it and we won't know if the port is up.

That's why "send", at least, is not optional.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231

Considering the successes of the wars on alcohol, poverty, drugs and
terror, I think we should give some serious thought to declaring war
on peace.

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