RE: Any good method to check network overload?

["David Gillett" <gillettdavid () fhda edu>]

  A significant difficulty with locating load-detection on
the equipment itself is that (a) the presence of load is
likely to interfere with the operation of the load-detection,
and (b) we've found that in some cases, the *presence* of
load-detection cuts into the load-carrying capacity of the
device -- sometimes by up to 30%!

  So I think the most the device can contribute to the task
is something like a heartbeat packet, which becomes slowed 
or missing as the device nears overload.  The detection of
this case and logging or alerting of the condition still
really has to be done off-device.

David Gillett


> -----Original Message-----
> From: swin [mailto:swin () student dlut edu cn]
> Sent: March 4, 2003 21:47
> To: gillettdavid () fhda edu
> Cc: security-basics () securityfocus com
> Subject: RE: Any good method to check network overload?
>
>
> David Wrote:
> > This suggests that if ping times are consistently more than
> some value,
> > or are timing out, then the network is probably overloaded.  (Pings
> > will also time out if the router is down, but you probably
> want to alert
> > for that, too.  If you need to distinguish between the two
> cases, compare
> > pings OF the router with pings THROUGH the router.)
>
>   What we want is an reliable way to check overload ,and we
> especially
> accentuate it should be reliable,this method sounds a lttle
> rough,indeed
> it can check if system is overload,but is it very reliable
> for automatic
> check?and we hope to install the check program on the server
> or router itself,if so ,is it different?
>
>   Thanks for you suggestion!
>
>   swin. wang