[asterisk-users] Dual Wan Router with Failover

[Matthew Rubenstein]

	There are several dual-WAN routers with load balancing and failover,
including the Xincom Twin-WAN series that I have tested OK with SIP (as
NAT): http://www.xincom.com/twinwan.php . Their other products probably
work, too.

	Keep in mind that load balancing on these devices assigns each TCP/IP
*connection* to its own WAN interface. So a large transfer on a single
connection is limited by the bandwidth of whichever interface it's
started on, even if the transfer starts slow enough to get assigned to a
smaller bandwidth interface, then expands to require the bandwidth from
the other WAN. The tech to de/multiplex streams works "well" only when
connecting to a single router endpoint, over relatively few hops that
can lengthen unpredictably the path some deplexed tackets travel. UDP
works better, but it still doesn't really work that well. What works
well is assigning different WANs to different apps' traffic, using
multiple WANs for failover, or just accepting that these techs are
better than nothing, and offer cheap ways to at least avoid a single
point of failure in the WAN scheme.


On Tue, 2006-11-14 at 08:07 -0700,
asterisk-users-request at lists.digium.com wrote:
> Date: Tue, 14 Nov 2006 10:07:41 -0500
> From: "Dean Collins" <Dean at cognation.net>
> Subject: RE: [asterisk-users] Dual Wan Router with Failover
> To: "Asterisk Users Mailing List - Non-Commercial Discussion"
>         <asterisk-users at lists.digium.com>
> Message-ID:
>         <677A75F88616F04E897D9D0E8397B10D06DC0F at cognationsvr1.Cognation.local>
> Content-Type: text/plain;       charset="US-ASCII"
> 
> Hi Jason,
> I was looking for an external solution outside of my asterisk box so
> that I can load balance my other website/email traffic as well.
> 
>  
> Cheers,
>  
> Dean
>  
> 
> > -----Original Message-----
> > From:
> asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> > bounces at lists.digium.com] On Behalf Of Jason
> > Sent: Tuesday, 14 November 2006 11:00 AM
> > To: Asterisk Users Mailing List - Non-Commercial Discussion
> > Subject: Re: [asterisk-users] Dual Wan Router with Failover
> > 
> > If you don't mind using linux, linux can do some fairly intense load
> > balancing all built in. Check out the Linux Virtual Server project.
> As
> > for WAN failover,  if you again don't mind using linux, you can
> script
> a
> > simple ping to the internet (I would ping at least 3 hosts) and if
> that
> > fails, fail to your second ISP.  You can also do some crazy fun
> stuff
> > with linux advance routing and bonding.
> > 
> > Jason
> > The place where you made your stand never mattered,
> > only that you were there... and still on your feet
> > 
> > 
> > 
> > Dean Collins wrote:
> > >
> > > Are you looking for load balancing or failover.
> > >
> > >
> > >
> > > Also is there a cheaper way of implementing load balancing than
> $845
> > > appliance?
> > >
> > >
> > >
> > >
> > >
> > > Cheers,
> > >
> > >
> > >
> > > Dean
> > >
> > >
> > >
> > >
> ------------------------------------------------------------------------
> > >
> > > *From:* asterisk-users-bounces at lists.digium.com
> > > [mailto:asterisk-users-bounces at lists.digium.com] *On Behalf Of
> *Todd-
> > > Asterisk
> > > *Sent:* Tuesday, 14 November 2006 9:26 AM
> > > *To:* Asterisk Users Mailing List - Non-Commercial Discussion
> > > *Subject:* Re: [asterisk-users] Dual Wan Router with Failover
> > >
> > >
> > >
> > > I've been looking for this as well..  I need to support up to 20
> VOIP
> > > phones over Internet as the Asterisk server is off-site.  We'll
> have
> > > multiple cable modems or DSL routers.
> > >
> > >
> > >
> > > I found this device which looks promising - does anyone have any
> > > experience with this?
> > >
> > >      http://www.peplink.com/productsLoader.php?productName=balance
> > >
> > >
> > >
> > >   Todd
> > >
> > >
> > >
> > > On Nov 13, 2006, at 8:49 PM, Dovid B wrote:
> > >
> > >
> > >
> > > Hi List,
> > >
> > > Does anyone know of a good dual wan router that can handle SIP
> well
> > > and can failover between connections if there is a SIP issue on
> one
> of
> > > the lines (meaning there still is a connection however there isnt
> > > enough bandwith or sip packets arent going thru etc.) ?
> > >
> > >
> > >
> > > Thanks.
> > >
> > >
> > >
> > > Dovid 
-- 

(C) Matthew Rubenstein