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Re: [K12OSN] OT: Using multiple DSL connections

I have a talk here in France with many provider...
They all recommend to use 2 ADSL, one for phone/voice and the other for data
That is because local ISP doesn't do any QOS... so when they have to drop
packet, they start to do it on heavily charged line...
No matter about the type of traffic !

As for voice, losing packet can significantly degrade phone conversation,
they all push them to take an over line and keep it very uncharged to make sure to don't have
any packet drop as well as to have low delay (ping)....

You must remenber that load balancing need to keep the same conversation
on the same phone....
And if you want to switch, Asterisk can be server part open solution...

----- Original Message ----- From: "Huck" <dhuckaby paasda org>
To: "Support list for open source software in schools." <k12osn redhat com>
Sent: Thursday, January 31, 2008 8:02 PM
Subject: Re: [K12OSN] OT: Using multiple DSL connections

PepLink also has a device...that handles 2-5 connections...

Rob Asher wrote:
I'd look at load balancing the two DSL connections using something like Mikrotik: http://www.mikrotik.com/ You could do the same with any linux machine but MT just happens to be my weapon of choice. Also, MT provides for very good QoS for things like VoIP via packet marking/mangle. Here are couple of things on their wiki that might pertain to what you're wanting to do: http://wiki.mikrotik.com/wiki/Load_Balancing_Persistent http://wiki.mikrotik.com/wiki/Two_gateways_failover_with_load_balancing HTH,

Rob Asher
Network Systems Technician
Paragould School District
(870)236-7744 Ext. 169

Peter Scheie <peter scheie homedns org> 1/31/2008 8:00 AM >>>
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?


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