Re: 2 adsl connections load balancing with natd/ipfw

gus_at_pbx.org

Date: Mon, 7 Jun 2004 00:22:16 -0400
To: "Mitch (bitblock)" <mitch@bitblock.com>


-- 
	
	gus huber <gus@pbx.org>
	pbx labs
On Sun, Jun 06, 2004 at 11:38:11AM -0700, Mitch (bitblock) wrote:
> Hi Rene!
> 
> That concept was recently suggested to me by a friend on another project - I
> haven't had a chance to try it yet though - any pointers on a starter rule
> set greatly appreciated...
> 
> thanks.
> 
> m/
> 
> > -----Original Message-----
> > From: Rene de Vries [mailto:rene@canyon.xs4all.nl]
> > Sent: Sunday, June 06, 2004 10:47 AM
> > To: Mitch (bitblock)
> > Cc: 'Joe Hamelin'; freebsd-isp@freebsd.org; David J. Hughes
> > Subject: Re: 2 adsl connections load balancing with natd/ipfw
> >
> >
> > Mitch,
> >
> > Why so complicated.
> >
> > Simply start two different natd instances one for each ADSL line. Make
> > one of the ADSL lines the default route. Then based on the source
> > address (just modified by natd) fast-route traffic which tries to leave
> > via the default route over the wrong interface to the other interface's
> > next hop (using ipfw).
> >
> > You could apply various methods of determining over which ADSL line the
> > traffic will leave, e.g. source port, source address, dest address
> > etc...
> >
> > This solution doesn't require provider assistance and would even work
> > when you have two different providers.
> >
> > Ren?
> >
> > On May 26, 2004, at 2:59, Mitch (bitblock) wrote:
> >
> > > Hey David - didn't see your reply before I replied to Joe there - any
> > > more
> > > info appreciated - I have both ends of the solution (I think) - just
> > > need to
> > > know the best way to config!
> > >
> > > Consider these ip's and interfaces... what do I do? Is ISPF lighter
> > > weight
> > > than BGP (considering the limited deployment?)
> > >
> > > Client A <-----\
> > >     X.X.X.2     \
> > >                  ----------> Router <------------->
> > >                  / / X.X.X.1         X.X.Y.2
> > >       X.X.X.3   / /
> > > Client B <-----/ /
> > >          <------/
> > >       X.X.X.4
> > >
> > > Router is FreeBSD based, and Client A and Client B are also FreeBSD
> > > based,
> > > and have a second interface to the internal networks at Client A and
> > > Client
> > > B.
> > >
> > > I'm wondering if my other problem (the fact that Client A can't see
> > > Client B
> > > as there is an ATM path for it to Router, but as Client B's addresses
> > > are on
> > > the same subnet, and not bounced off the Router (and there is no
> > > direct ATM
> > > path) there is no connection...
> > >
> > > Any help or advice greatly appreciated.
> > >
> > > Thanks.
> > >
> > > m/
> > >
> > >> -----Original Message-----
> > >> From: owner-freebsd-isp@freebsd.org
> > >> [mailto:owner-freebsd-isp@freebsd.org]On Behalf Of David J. Hughes
> > >> Sent: Tuesday, May 25, 2004 4:08 PM
> > >> To: 'Joe Hamelin'; freebsd-isp@freebsd.org
> > >> Subject: RE: 2 adsl connections load balancing with natd/ipfw
> > >>
> > >>
> > >>
> > >> Actually, that isn't quite correct.  You do not need a virtual IP
> > >> address (such as an HSRP or VRRP setup).  You just need equal cost
> > >> paths from the ISP to you.
> > >>
> > >> To achieve this you will need to route an address range from your
> > >> ISP to your network.  It can be your address space, a small piece
> > >> of ISP provided space, or even a chunk of private space.  Just as
> > >> long as it's routed from the ISP to you via the DSL tails.  The
> > >> ISP just needs to see equal cost paths to your prefix via BOTH
> > >> your DSL tails.  That way they will use both.
> > >>
> > >> There are several ways to do this (inc running eBGP or OSPF to them
> > >> from your equipment).  Have a chat with your ISP to see what options
> > >> they would consider.
> > >>
> > >>
> > >> David
> > >
> > > _______________________________________________
> > > freebsd-isp@freebsd.org mailing list
> > > http://lists.freebsd.org/mailman/listinfo/freebsd-isp
> > > To unsubscribe, send any mail to "freebsd-isp-unsubscribe@freebsd.org"
> > >
> > --
> > Ren? de Vries <rene@tunix.nl>
> > Tunix Internet Security & Training
> >
> >
> 
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Re: 2 adsl connections load balancing with natd/ipfw

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