With the setup you explained it is impossible
either ingressing or egressing. Both your ISP's
would assign you a different global IP. On a
connection-oriented protocol like TCP this is not
going to work too well.

To load balance ingress traffic from both ADSL
providers would be impossible, especially with two
differnet global IP addresses as the destination.
To do something alonmg these lines you need to
peer with your providers, advertise your own
routes to the upstream providers (or be allowed to
advertise each providers IP address through the
others network). In this day and age BGP is the
only option, but the protocol itself has
limitations as you will easily see traffic
becoming assymetrical, as the best path to your
network would be decided by the source not you
(the destination).

Finally, what do you mean with load balancing? A
common misconception regarding this term is that
it refers to euqal distribution of the traffic
load. In a network under a single administration,
equal distribution of traffic can be very elusive.
On the IP cloud (internet, internetwork, or
whatever you want to call it) traffic will pass
through multiple networks under different
administrators before even reaching you
(destination). On the internet, and when peering
with multiple providers one must be aware that
load balancing will be affected (ingress) by how
you advertise your AS, and (egress) by routing
updates received from peering AS. Manipulating
MEDs and numerous other tricks are out there to
get some form of BEST UTILIZATION from your links
(or what others would like to call load balancing)
but these are feasible only on the internet with
BGP peers.

G>

----- Original Message -----
From: "L. V. Lammert" <lvlomnitec.net>
To: <ziga.huskiczejn.si>; <miscopenbsd.org>
Sent: Tuesday, October 22, 2002 2:14 PM
Subject: Re: 2 ADSL / load balancing problem(?)

At 02:08 PM 10/22/02, Ziga Huskic wrote:

>Hi,
>
>I have 2 ADSL lines as uplink for small office,
how can I set OpenBSD
>to use both of those for outgoing/incomming
traffic?

Outgoing is doable, .. but you will not be able to
split incoming traffic
without cooperation of the upstream ISP in
broadcasting the IP address
(which you are most likely not going to get with
an ADSL connection).

         Lee

============================================
    Leland V. Lammert
lvlomnitec.net
       Chief Scientist
Omnitec Corporation
   Network/Internet Consultants
www.omnitec.net
============================================

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