Amos Shapira wrote:
On Sun, Jul 19, 2009 at 09:36:47AM +1000, Amos Shapira wrote:
I'm looking for an Ethernet hub to be used for network troubleshooting
(trying to find which of our hosts is involved in the load on our
office uplink)
Hi Amos,
I might be a little late now... if you've progressed this far with the
hub option you might as well go all the way now...
However, you are doing this the hard way. You don't need an ethernet
hub if you already know where the traffic is going. All you need to do
is investigate the traffic on your office uplink. Its possible that the
device you use for the uplink already might give you this info... but if
it doesn't, you should replace the uplink device with a Linux PC and
just sniff the traffic from there. Starting from scratch this should
take about 2 hours to complete (assuming it takes an hour to install
your favourite flavour of Linux and you're not using mesh VPNs or other
complex configurations). Ideally you would configure the Linux PC to be
the local gateway, and then reconfigure the existing uplink device to
provide the link between the Linux PC and outside.
If you want to really get your hands dirty, you could configure the
Linux box with 2 interfaces as a bridge and simply insert it in between
your switch and your office uplink. This would allow you to sniff the
traffic without needing to change any IP configs on the existing
network. (Ah, I see Rob Collins said something like this last week -
"you can make a trivial two port switch out of a linux machine with
brtools").
Cheers,
Marty
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