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UDP port monitoring

Posted on 2004-10-08
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Last Modified: 2008-03-10
I would like to build a simple program that will monitor different UDP ports on a number of servers I have employed.  I want the program to be run as a cronjob, and notify me of any downs that it detects.

The problem I'm having is getting a guarenteed UDP response when I need to detect if the port is responding or not.

 Do I need to setup a UDP client for each server that I expect to be on that port?   Or is there a guarenteed way to receive a UDP response indicating that there is a server responding on said port?  The types of UDP applications that I can expect to monitor are:

DNS server
Half Life/Counter Strike server
Team Speak server
echo server
daytime server

Thank you for your help.
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Question by:vancetech
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kandura earned 375 total points
ID: 12264625
Have you considered using nmap?

    nmap -sU -p 53 localhost

works nicely on my dns server.
It can take a list of ports after the -p, and a list of hosts.
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by:vancetech
ID: 12264689
I was hoping to use just default Perl modules to avoid any portability or re-installation work that would need to be done.  By default I don't have nmap installed on my linux system.

Thank you for that suggestion.
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Author Comment

by:vancetech
ID: 12264708
nmap does has an interesting description of UDP port monitoring that may be useful:

UDP scans: This method is used to determine which UDP (User Datagram Protocol, RFC 768) ports  are  open
              on  a  host.   The  technique  is  to send 0 byte udp packets to each port on the target machine.  If we
              receive an ICMP port unreachable message, then the port is closed.  Otherwise we assume it is open.
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Expert Comment

by:kandura
ID: 12264720
heh :)

You saved me from having to dive into IO::Socket::INET and udp, phew!
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