[K12OSN] networking question

William Fragakis william at fragakis.com
Wed Feb 19 15:03:25 UTC 2014

(btw, hope all is well) big thanks to both you and Scott for your
exhaustive answers.

We seem to be doing okay on the bandwidth internally, nothing is hanging
or lagging even with a few clients playing Pandora and a bunch of
internal rdesktop sessions. I think I'll downstream lower bandwidth
devices like printers, secondary vms, etc to a second inexpensive

Off topic  - heard on NPR how Los Angeles schools thought it would be a
good idea to get each student an iPad at about $700/device so they could
"all have computers". That was about the price of my latest kvm server
with an AMD 8 core CPU, 24GB RAM and 240GB  SSDs in a RAID 1. Not to
mention the iPads are getting broken/stolen which makes the whole
process even more expensive. Not that we don't have iPads in our own
househould. Just that LTSP continues to make a ton of sense.

again, my thanks and best regards to all,
William Fragakis

> Message: 2
> Date: Mon, 17 Feb 2014 13:04:01 -0500
> From: Jim Kinney <jim.kinney at gmail.com>
> To: "Support list for open source software in schools."
> 	<k12osn at redhat.com>
> Subject: Re: [K12OSN] networking question
> Message-ID:
> 	<CAEo=5PzBCO90EcRGrc-w7fwWgknLaYA5NnAyH7YPvvJskKmMFQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
> my ordering for solution:
> 1) bigger switch (big assumption is existing network is not overloaded now)
> 2) add a secondary "smart" switch above the existing switch if the existing
> switch supports "upstream" port
> 3) add a second switch downstream with a bonded or aggregate connection for
> more bandwidth (if "smart" primary switch)
> 4) add a secondary switch with Gbit upstream and 100M ports and set primary
> switch to 100M except for new switch port
> 5) add a secondary switch upstream with bonded/aggregate connections to
> multiple nics on server
> 6) add a second switch off second nic on separate subnet and split the
> load. This requires a split subnet with dual gateways (each nic) (no smart
> switch required)
> On Mon, Feb 17, 2014 at 10:30 AM, William Fragakis <william at fragakis.com>wrote:
> > Our k12linux installation is out-growing our present, very primitive,
> > networking structure.
> >
> > Currently, our ltsp server - which also behaves as the firewall for a
> > number of kvm servers and their vms - connects to 16 or so thin clients.
> > Between the clients, internal servers and printers, the switch to which
> > the ltsp server is connected to is at capacity (It's a basic 24 port
> > gigabit).
> >
> > We now need to add the n+1 client that exceeds switch capacity. Do we
> > buy
> > a) a larger switch to replace the current one
> > b) a second switch daisy chained to the current one
> > c) a second switch connected to a second NIC using the same internal
> > ip/dhcp range (and if so, the recommended manner)
> > d) a more obvious, elegant, simple, cheaper method that I haven't
> > considered because I don't know squat (American slang for "not much")
> > about this stuff.
> >
> > thanks to all,
> > William Fragakis
> >
> > _______________________________________________
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> > K12OSN at redhat.com
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> > For more info see <http://www.k12os.org>
> >
> -- 

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