Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 843
  • Last Modified:

UDP port monitoring

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.
0
vancetech
Asked:
vancetech
  • 2
  • 2
1 Solution
 
kanduraCommented:
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.
0
 
vancetechAuthor Commented:
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.
0
 
vancetechAuthor Commented:
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.
0
 
kanduraCommented:
heh :)

You saved me from having to dive into IO::Socket::INET and udp, phew!
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

  • 2
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now