asterisk users - Jul 2006 - *****SPAM***** Load balenced (ADSL) network connections, is it possible?

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Vorschau: Hi List, I need to put an Asterisk server in a remote
  office where only ADSL is available. Maximum of 8meg downstream 646k
  upstream. I need to handle 20 concurrent calls over IAX preferably uLaw,
  so 64k per channel. [...] 

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From: "Chris Blunt" <chris.blunt@entropy-it.com>
Subject: [asterisk-users] Load balenced (ADSL) network connections,
	is it possible?
Date: Thu, 20 Jul 2006 14:10:37 +0100
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Chris Blunt wrote:
>
> Hi List,
>
> I need to put an Asterisk server in a remote office where only ADSL is
> available. Maximum of 8meg downstream 646k upstream.
>
> I need to handle 20 concurrent calls over IAX preferably uLaw, so 64k
> per channel.
>
> Is it possible to somehow have multiple NICs in the server each with a
> different IP address pointing to a different default gateway (router).
> But then some how load balanced into a virtual network connection?
>
> Any ideas or solutions would be appreciated ? just in case I have gone
> off at a wild tangent.
>
> Thanks
>
Well, for 20 channels over trunked IAX, you will need roughly 1300Kbps
up and downstream using G.711u (over 1500Kbps if not trunked).
With a pair of ADSL connections, with QoS, you still don't really have
anough bandwidth.
Are you sure using G.729 or G.723.1 (or even G.726) wouldn't be allowed?

Also, it's worth finding out if the local exchange is ADSL 2+ enabled
with any operator (16Mb/1Mb).

Also worth noting, that if you sign up to an 8Mbit service, and your
ADSL modem manages to sync at that speed (never seen it, but it's not
impossible). Your actual throughput will only be 7150Kbps (also upstream
will be less than stated by the sync rate). This is before you lower
these even more through use of QoS.

Chris,

Take in account that 64k on the RTP layer is about 108 kbit on DSL when sending
50 packets/s (20 ms samples)

ERik


Chris Blunt wrote:
> Hi List,
> 
>  
> 
> I need to put an Asterisk server in a remote office where only ADSL is 
> available.  Maximum of 8meg downstream 646k upstream.
> 
>  
> 
> I need to handle 20 concurrent calls over IAX preferably uLaw, so 64k 
> per channel.
> 
>  
> 
> Is it possible to somehow have multiple NICs in the server each with a 
> different IP address pointing to a different default gateway (router). 
> But then some how load balanced into a virtual network connection?
> 
>  
> 
> Any ideas or solutions would be appreciated ? just in case I have gone 
> off at a wild tangent.
> 
>  
> 
> Thanks
> 
>  
> 
> --
> 
>  
> 
> Chris Blunt
> 
> Entropy IT Ltd
> 
>  
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> --Bandwidth and Colocation provided by Easynews.com --
> 
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users


Erik Versaevel

On Thursday 20 July 2006 15:10, Chris Blunt wrote:
> I need to handle 20 concurrent calls over IAX preferably uLaw,
> so 64k per channel.
Now that Thomas has handled your current bandwidth limitations, 
I'll take a look at what you are trying to achieve...
> Is it possible to somehow have multiple NICs in the server
> each with a different IP address pointing to a different
> default gateway (router).


With routers to handle all your routing requirements, I haven't 
looked at pointing my default to more than one router. However, 
looking at http://www.clintoneast.com/articles/multihomed.php 
makes it seem like it can work.

Googl'ing 'linux multiple default routes' also turns up some 
interesting results. You might also look at running a routing 
protocols on the box.

> But then some how load balanced into 
> a virtual network connection?
Can you explain further - do you mean the single same connection 
coming through the single same router?

Mark.
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Unless my brain did melt down under the high heat here, there are a few
things I would share :

 

-          1 channel u-law uses at least 80k because of encapsulation

So, think about compression

-          You can never use 100% of a bandwidth. (80% is a good max)

-          The values given are maximum values, far from the guaranteed
values

-           

 

Instead of adsl, I would go for sdsl (symmetrical)

Where adsl is possible, sdsl is normally also possible

Sdsl is more expensive but you can demand sla, higher guaranteed bandwidth
(up to 50 or 100%)

 

Never forget that the guaranteed bandwidth is between your router and the
first equipment of your provider. 

You get NO warranty you have that bandwidth further away even on your isp
backbone.

 

Isp sales men always forget to talk about that

If they say you get 100% to use all the time, sign immediately IF they put
that WRITTEN alongside financial compensation if they fail.

Dear mister sales man, you do not have to worry about compensation since you
guaranteed it would not happen  ;-)

 

 

Other problems you will face with several IP?s :

 

Even if you can manage several IP?s for the outgoing traffic, you cannot for
incoming traffic as those are unaware of your situation

Or they need to put multiple entries for you asterisk and try those
sequentially

Or you could go up for incoming calls and down for outgoing calls

That is a simple solution, that will statistically work but NO warranty

NOT really a telco way 

 

Routing problems might occur

 

?

 

 

Regards,

 

T. Jacobson 

 

 

 

 


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Have you considered SDSL for higher bandwidth?  Also, a dual wan router
would help with your load balancing problem?  Just google'd and spotted one
that seems to be voip friendly.  For incoming calls you could ask your ISP
to bind your ADSL/SDSL feeds.

Hypothetical offcourse :-)


http://www.peplink.com/productsFeatures.php?productName=balance


Phil.


----- Message from "Chris Blunt" <chris.blunt@entropy-it.com> on
Thu, 20
Jul 2006 14:10:37 +0100 -----
                                                                           
      To: <asterisk-users@lists.digium.com>
                                                                           
 Subject: [asterisk-users] Load balenced (ADSL) network connections, is it 
          possible?                                                        
                                                                           

Hi List,

I need to put an Asterisk server in a remote office where only ADSL is
available.  Maximum of 8meg downstream 646k upstream.

I need to handle 20 concurrent calls over IAX preferably uLaw, so 64k per
channel.

Is it possible to somehow have multiple NICs in the server each with a
different IP address pointing to a different default gateway (router). But
then some how load balanced into a virtual network connection?

Any ideas or solutions would be appreciated ? just in case I have gone off
at a wild tangent.

Thanks

--

Chris Blunt
Entropy IT Ltd

>
> > I need to put an Asterisk server in a remote office where only ADSL is
> > available.  Maximum of 8meg downstream 646k upstream.
> >
Is this an adsl2 line ?
If yes ask your provider if it supports channel bonding. You could use 2
adsl lines as one. All "load balancing" etc is done at the dslam side.
Also if annex M is supported you can get up to 3,5 mbits of upload
(theoreticaly, usually is close to 2mbits, heavily depends on distance and
line conditions)
If you need to load balance at your side (ie the office) it can be done but
would require setting up 2 * servers connected to each other and using some
form of round robing the dns so that requests reach both servers.
If the dsl line is also used for other purposes than voip, make sure that
you use qos or you will be facing problems with the quality of the calls.

Stelios

> Is it possible to somehow have multiple NICs in the server each with a
> different IP address pointing to a different default gateway (router).
But
> then some how load balanced into a virtual network connection?
> 
> Any ideas or solutions would be appreciated - just in case I have gone
off
> at a wild tangent.
I have successfully tested a MultiLink PPPoE connection with DSL tails.
If your ISP supports this then that would be the best way to do it. If
they can supply a 512/512 DSL connection then just aggregate these
together until you have the required amount of bandwidth.

James