[CentOS] How to find out what's eating the bandwidth

Mon Mar 29 19:59:18 UTC 2021
Matthew Miller <mattdm at mattdm.org>

On Sun, Mar 28, 2021 at 11:36:00AM -0600, Frank Cox wrote:
> It's a really basic setup "routers from Staples" (dlink and tplink brands I think) plugged into the ISP's modems.
> > You're right that you generally can't see everything from just any computer
> > on a network, at least if it's switched. You need to watch from your
> > gateway.
> Then I'm outta luck for doing this sort of thing since the gateways are
> the tplink and dlink routers. I thought that might be the case.

There are two options you could explore:

* putting openwrt or another open-source firmware on those devices, if they
  support them. 

* Use a CentOS (since that's the list!) box with two NICs as a bridge and
  configure that for snooping.

Or I guess option 3 would be to replace the routers with ones which do allow
you use an open firmware. You could even do that temporarily just for the

And finally, an option four: some router brands have their own proprietary
bandwidth monitor tools. Asus, for example. (Note that you probably can't
get full gigabit speeds with this enabled on an off-the-shelf consumer
router, though.)

Matthew Miller
<mattdm at fedoraproject.org>
Fedora Project Leader