[mrtg] Re: Untraceable traffic spikes

Isaac Grover isaac at coe.engr.sjsu.edu
Tue Dec 5 20:21:18 MET 2000

Hey everyone,

Apparently I miscommunicated my problem in yesterday's message.  There's multiple reasons
for traffic spikes: network backups, large file transfers, DoS attacks, the list goes on.
But all those situations have an in/out = out/in correlation on the graphs.  My situation
doesn't correlate well.

I've attached two GIFs that represent opposite sides of the same pair of fiber.  This is
what I saw just minutes ago, so I'd appreciate any insight.


Isaac Grover wrote:

> Hey everyone,
> I've been watching these spikes for the past couple weeks trying
> to find the source of the traffic spikes in the graph, but I'm
> not getting anywhere.
> This device is a Xylan OmniSwitch Router with an ASX-622 ATM
> uplink (the source of the graph) with one ESX 10/100 blade.  The
> device on the other end of the fiber is a Xylan OmniSwitch 9-slot
> chassis with ASM-622 ATM uplinks.  I've been watching every
> interface on both the OS/R and the OSW/9, but the only interface
> that shows these spikes is the ASX-622; even the ASM-622 on the
> other end of the fiber shows no spikes.
> Here's a copy of my cfg for this particular interface (mrtg 2.9.2
> on FreeBSD 4.1.1-i386 BTW):
> ---8<---
> Options[^]: growright, bits,
> #---------------------------------------------------------------
> # System Name: OSR-237
> Target[192.168.x.x.2001]:
> at 192.168.x.x*53
> MaxBytes[192.168.x.x.2001]: 77750000
> Title[192.168.x.x.2001]: OSR-237 CSM-155 to OSW9-204
> ---8<---
> Not only do I have no idea where this data is coming from, but
> it's very out of the ordinary on this network to see anything
> larger than 4Mbps so these traffic spikes are hindering the
> visual "normalcy" of my graphs.  =)
> Has anyone else seen something like this before?
> P.S. Please don't pester me about the GIF image.  Steve's
> routers.cgi v1.2 did GIFs by default, and I'm in the process of
> transitioning to v1.5 which creates PNGs.  Thank you.  =)

Isaac Grover - isaac at coe.engr.sjsu.edu
SJSU College of Engineering, ECS / Networking
ENG 237, (408) 924-4074

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