Solved

UDP port monitoring

Posted on 2004-10-08
4
835 Views
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.
0
Comment
Question by:vancetech
  • 2
  • 2
4 Comments
 
LVL 18

Accepted Solution

by:
kandura earned 125 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.
0
 

Author Comment

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.
0
 

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.
0
 
LVL 18

Expert Comment

by:kandura
ID: 12264720
heh :)

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

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
perl split by | 2 91
Exchange 2010 Transport Rule Regex 28 96
PERL - Find newest folder 12 118
XPath Syntax help in conjunction with perl XML::LibXML 18 104
Many time we need to work with multiple files all together. If its windows system then we can use some GUI based editor to accomplish our task. But what if you are on putty or have only CLI(Command Line Interface) as an option to  edit your files. I…
Email validation in proper way is  very important validation required in any web pages. This code is self explainable except that Regular Expression which I used for pattern matching. I originally published as a thread on my website : http://www…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

27 Experts available now in Live!

Get 1:1 Help Now