All Archives / aussie-isp / 2002-12
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Date: Tue, 03 Dec 2002 10:03:48 +1030
From: John Edwards
To: Jamie
Cc: aussie-isp
Message-Id: <3DEBEDDC.7020809@adam.com.au>
References: <003901c29a06$10f220a0$0100a8c0@jamie>
Subject: Re: [Oz-ISP] Load balance two dsl connections on cisco 1751 - point me in the right direction
Followups:

<008501c29ad7$d5f62640$0100a8c0@jamie>


Jamie wrote:

>
>Have a Cisco 1751 router with 2 ADSL cards in it. The connections will be
>brought up and assigned a different /32 address. I need to load balance
>traffic between the two links evenly.
>
Do you need to load balance inbound or outbound or both?
Are the dual links for greater bandwidth or redundancy?
Are the links to the same provider?
Does the provider(s) use Telstra L3, L2, or other?
Is the router doing NAT outbound to these links?

You can achieve simple outbound load balancing by simply putting an
equal default route to each interface, but I suspect that isn't what you
want. You can also be a bit more consistent by routing 0.0.0.0/1 out of
one link and 128.0.0.0/1 out the other. To get some sort of inbound load
balancing with an indifferent upstream, you're probably going to need
NAT or some kind of proxy device.

John Edwards






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