[lug] Detect remote IP Address

[John Hernandez]

Try using nc from cron to tickle a port and trip a firewall log entry.  nc = netcat.  You can use -w to adjust timeout values.

-John

Ferdinand Schmid wrote:

> HI,
> I have a remote system that I am trying to check in with on a regular 
> basis. This system connects to the Internet on demand and receives a 
> dynamically assigned IP address.
> 
> My current way of identifying this system is to have an on site person 
> initiate an ssh connection to one of my systems that doesn't accept ssh 
> and then I look up the IP address in my firewall logs.
> 
> Now I would like to have a cron job that does the above for me once a 
> day.  But I can't get ssh or telnet or ftp... to limit their connection 
> attempts.  I experimented with ssh's ConnectionAttempts parameter with 
> no luck.
> 
> I don't really want to send out an e-mail with the remote system's IP 
> address to myself every time the system becomes available.
> 
> Any ideas?  I could send a few random IP packets to trip my firewall - 
> but I haven't ever had to do that and don't know - and if this approach 
> would be appropriate anyway.  So I am open for suggestions.
> 
> Thanks,
> Ferdinand
> 
> -- 
> Ferdinand Schmid
> http://www.archenergy.com
> 303-444-4149 x231
> 
> _______________________________________________
> Web Page:  http://lug.boulder.co.us
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   - John Hernandez - Network Engineer - 303-497-6392 -
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