I have not any idea how to construct a packet to send/receive...I did not thing was necessary to use that plugin......
>From yesterday evening there are a couple of udp/port that goes up/down in 5/10 minutes...Using old version , check_udp (nagios-plugins 1.3.1) 1.4.2.1 , without any strings. How can be possible? The port is always open. Using nmap command I see all the UDP/ports open.. Must I use that command to monitor my UDP/ports ??? Marco -----Messaggio originale----- Da: frank [mailto:ra...@they.org] Inviato: giovedì 5 settembre 2013 20:24 A: Nagios Users List Cc: Marco Borsani Oggetto: Re: [Nagios-users] R: check_udp error message You need to send a message that the listening daemon will understand. The check_snmp plugin speaks the SNMP language so it knows how to construct a packet that snmpd will understand. I imagine an OID is a requirement for check_snmp, as well as community string or security credentials, those are all part of the "send". If you want to use check_udp for this, then you have to construct that packet yourself. On the flip-side, you should know the expected response to a known query. If you make an SNMP request for .1.3.6.1.2.1.1.4.0 you should expect a string from the "syscontact" line from your snmpd.conf in response. Just like you would use check_http rather than check_tcp for an Apache service, it's probably best to use a custom program like check_dns rather than check_udp to check a DNS service. In the case of SNMP, I prefer to use or write scripts that are specific to what I'm polling rather than using a generic request/response program. For instance, a program like check_snmp_load.pl could be alot more robust than running "check_snmp -o .1.3.6.1.4.1.2021.10.1.3.1" alone. -f On Thu, 5 Sep 2013, Marco Borsani wrote: > Date: Thu, 5 Sep 2013 09:06:38 +0200 > From: Marco Borsani <m.bors...@it.net> > Reply-To: Nagios Users List <nagios-users@lists.sourceforge.net> > To: 'Andreas Ericsson' <a...@op5.se>, > 'Nagios Users List' <nagios-users@lists.sourceforge.net> > Subject: [Nagios-users] R: check_udp error message > > Ok, but what can I "send" and "receive" to/from the host? > > I also tried old version of check_udp (that does not need any string), > but I read : > No data was recieved from host! > No response from host on port XX > > Or simply: > No response from host on port XX > > I see another strange situation. > On port 161 I can use check_snmp (work correctly), but if I use > check_udp on port 161 it does not work at all ! > How can be possible ? > > Regards > > -----Messaggio originale----- > Da: Andreas Ericsson [mailto:a...@op5.se] > Inviato: marted? 3 settembre 2013 15:54 > A: Nagios Users List > Cc: Marco Borsani > Oggetto: Re: [Nagios-users] check_udp error message > > 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. > > ------------------------------------------------------------------------------ Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk _______________________________________________ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
