Feature request: net.udp.port[<ip>, port]

[erisan500]

I don't know how easy/difficult it would be but it would come in handy if we had an item to check for UDP ports: net.udp.port[<ip>, port].

That would allow us to check for ex. Voip services.

I suppose net.tcp.port[<ip>, port] doesn't work with UDP ports ?

[sauron]

See RFC. We can test UDP only by application. It's not TCP.

[erisan500]

Well, this should help then:

Scanudp : http://www.geocities.com/fryxar/ (halfway down the page)

[sauron]

Scanudp:

This simple program written in C for Linux scan for UDP ports in remote hosts, determining which UDP services they are offering. All UDP scanners that I proved works under the following principle:

UDP datagram -> Closed Port -> ICMP Port Unreachable

UDP datagram -> Open Port -> No Reply (or application dependent)

ICMP answer can be switch off. It's very simple. If you need check work service in all situations, you need send proper packet for service.

[wschlich]

Ok, then you have to do it by application.
Any plans on supporting specific UDP applications?

Those pop to my mind:

Misc:
- DNS (53)
- Syslog (514)
- Portmap (111)
- NTP (123)
- Samba/NetBIOS (137, 138)
- DHCPD (67)
- OpenVPN (1194)

Asterisk/VoIP related:
- SIP (5060) -- Session Initiation Protocol
- IAX2 (4569) -- Inter Asterisk eXchange
- DUNDi (4520) -- Distributed Universal Number Discovery

[sauron]

- DNS (53)
- NTP (123)

Already supported. Check options.

[wschlich]

Ah, great.
What about the others anyway?

[abhi238]

What about SNMP Agent Status on UDP port 161 ?

If an SNMP Agent is down, we need to get a trigger/alert saying agent is down.
Presently simple checks don't support udp port

[Calimero]

What about SNMP Agent Status on UDP port 161 ?

If an SNMP Agent is down, we need to get a trigger/alert saying agent is down.
Presently simple checks don't support udp port

You could use the nodata() function on one of your SNMP items to check whether snmp agent on host is fine.

[abhi238]

Hi,

I tried with nodata() function for items ifInOctets or La_load15 but does not work well as it triggers the events for most of the systems even if it responds to snmp queries.


Trigger Expression given:
1. {MY_SNMP_DEVICE:ifInOctets.1.nodata(300)}=1
2. {MY_SNMP_DEVICE:la_load_15.nodata(300)}=1