[mrtg] Re: MRTG Validity

[Paul C. Williamson]

A ping test doesn't show any kind of traffic, just how fast the interface is able to respond.  Trust MRTG.  Here's a little story...

About 6 months ago, we had a single T1 for browsing and a single T1 
for our VPN and e-mail.  Then we upgraded to dual T1's for both.  During 
the change, our outbound traffic for browsing (which was only about 5%), 
suddenly jumped to sustained use of about 20%, with peaks of about 95%.
Previous peaks were no larger than 15%.  I thought it was strange, so I 
cantacted our routers guys.  Before they were believers, they used to 
doubt what MRTG reported.  This single event made them believers. 
We looked, and no other interface had changed traffic patterns, and volume on every other interface had dropped to half.  That's what I expected.  
After some real digging, we discovered that our ISP was advertising 
our internet routers as BGP routers to the general internet.  Tons of 
outgoing traffic, but very low incoming traffic.  There is something 
up with that router.  What is cpu load like?  Ours jumped from 10% to over 50% - that was another indicator that something was wrong...

Paul

ps - Diebold?  When are you guys going to get off OS/2 for Automatic 
Teller machines???


>>> "Gerlak, Matthew" <GerlakM at diebold.com> 11/19/01 08:22AM >>>



Hello all,

             I have been running MRTG for the last 4 months. I have run into a situation
Were are graphs were showing a certain link running at about 20% for the last month then 
All of the sudden it started running at 98% on incoming traffic. Our networking group claims 
That our graphs are wrong because the say that the are doing a ping test and that there is no
Traffic on the link. 

   How good is a ping test and how reliable is the data from the ping test compared to Mrtg.

matt

--
Unsubscribe mailto:mrtg-request at list.ee.ethz.ch?subject=unsubscribe 
Archive     http://www.ee.ethz.ch/~slist/mrtg 
FAQ         http://faq.mrtg.org    Homepage     http://www.mrtg.org 
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi 



--
Unsubscribe mailto:mrtg-request at list.ee.ethz.ch?subject=unsubscribe
Archive     http://www.ee.ethz.ch/~slist/mrtg
FAQ         http://faq.mrtg.org    Homepage     http://www.mrtg.org
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi