From: Jay Hennigan (jay@west.net)
Date: Wed Jan 14 2004 - 05:04:37 GMT-3
On Wed, 14 Jan 2004, David Heaton wrote:
> The answer depends on your application requirements...
>
> If the application requires continues connectivity, but can deal with
> changing of IP address (i.e. usual WEB browsing) then all you need is a
> box which provides redundant NAT availability such as
> http://www.radware.com/content/products/lpb/default.asp (you can get
> similar functionality at about half the price). All this products work
> similarly, they can NAT into either provider IP space, but then they
> check each link for health (not just link light) and choose one of 2
> spaces, even loadbalancing is supported. Obviously no protection
> against box itself failing but this is not what you looking for, right?
>
> If application requires persistent IP then setup is a little more
> difficult but not impossible. Usually it is achieved with BGP, but it
> is not an option. What you can do though:
>
> * you need a secondary site (such as your home office) where you have
> highly reliable Internet connectivity
>
> * then you put one of the loadbalancers at your reliable site and
> another at your CEO home office
>
> * then you run VPN tunnel between 2 boxes, the boxes will be able
> to make the tunnel available as long as at least one path exists
>
> * then you tunnel all IP traffic via VPN to your reliable site and
> send it to Internet from there
>
> This way high availability from CEO home office is only provided to
> reliable site, but from there it is much easier to send it reliably to
> Internet keeping same IP. Packets will make 2 Internet trips one to
> your reliable site and another to the ultimate destination.
>
> Best regards,
> Alexei
>
> P.S. Cisco does not have an easy solution for ether of 2 options, you
> get to go third party but the technology was around for a while and
> works well.
Actually Cisco does, but it's not mainstream Cisco. Very cool box
that can be configured for either scenario:
http://www.linksys.com/products/product.asp?prid=589&scid=29
-- Jay Hennigan - CCIE #7880 - Network Administration - jay@west.net WestNet: Connecting you to the planet. 805 884-6323 WB6RDV NetLojix Communications, Inc. - http://www.netlojix.com/
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