[K12OSN] OT: Using multiple DSL connections

Steven Santos steven at simplycircus.com
Thu Jan 31 17:12:57 UTC 2008

Something like this will work for two connections:

If you have to balance more than two connections, it gets harder.

Steven Santos
Director, Simply Circus, Inc.
Email: Steven at SimplyCircus.com
 Mail: 14 Pierrepont Road
       Newton, MA 02462
Phone: 617-527-0667
  Web: www.SimplyCircus.com <http://www.SimplyCircus.com>

> -----Original Message-----
> From: k12osn-bounces at redhat.com [mailto:k12osn-bounces at redhat.com]On
> Behalf Of Peter Scheie
> Sent: Thursday, January 31, 2008 9:00 AM
> To: Support list for open source software in schools.
> Subject: [K12OSN] OT: Using multiple DSL connections
> I have a client site where we've installed K12LTSP-5EL with a
> single gig NIC,
> connected to a switch (which in turn has another switch daisy
> chained off it via
> gigabit connection).  The clients all have 100Mb connections.
> The clients are a
> mix of thins, Windows, and Macs.  They have Vonage phones, which
> according to my
> reading, each require about 90K of bandwidth.  I think they have
> 4-6 such phones
> now and anticipate adding more, although I don't know what the
> upper limit is yet.
> Because of the bandwidth requirements of the Vonage phones, and
> anticipated
> growth in the number of phones, they have installed two DSL
> lines.  I have not
> had a chance to test the lines to see what kind of bandwidth, up
> & down, they
> each provide.  As it stands right now, the LTSP server provides
> DHCP, but points
> to only one of the two DSL bridges as the default gateway.  IOW,
> at the moment,
> the second DSL line isn't being utilized.
> My question is whether anyone has any suggestions about how to
> utilize/share/combine the bandwidth of both DSL lines so that all
> computers and
> all phones can make use of either/both lines.  I could put the
> phones onto a
> separate physical network and confine phones to one DSL line and
> the computers
> to the other, but that seems inefficient and inflexible, and it
> means they will
> have to make sure they pay attention to which network they plug
> into (which they
> won't understand and therefore will do incorrectly).  Depending
> on the time of
> day, computer traffic will decline as phone traffic increases,
> and vice-versa,
> although the nature of their respective traffic patterns is
> different (i.e.,
> computer traffic tends to be bursty).  What I'd really like is to setup a
> dedicated linux box to act as the gateway for the network, put
> three NICs in it,
> one for the internal network and one for each DSL line, and have it load
> balance/round robin the traffic between the DSL lines.  Any suggestions?
> Peter
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