[K12OSN] OT: Using multiple DSL connections

[Olivier Mugnier]

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 at paasda.org>
To: "Support list for open source software in schools." <k12osn at 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
>>
>>
>> -------------------------------------
>> Rob Asher
>> Network Systems Technician
>> Paragould School District
>> (870)236-7744 Ext. 169
>>
>>
>>>>> Peter Scheie <peter at 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?
>>
>> Peter
>>
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