Re: [cobalt-users] [OT] Dual Homing... How?

[Rickard Osser <ricky@xxxxxxxx>]

On Thu, 2 Nov 2000, Jeff Lasman wrote:

> rpaiz@xxxxxxxxxxxxxx wrote:
> 
> > I know this isn't Cobalt, but I need quick help and you guys/gals are it...
> > (thanks in advance, too!)
> 
> I don't think Cobalt will have the answers you're really looking for;
> they're NOT Cobalt-specific questions.
> 
> > I'm getting my little hosting business off the ground, and I've contracted
> > two totally independent links to the Internet. Totally independent means
> > different providers, routes, fiber, and even different satellites, which
> > makes me happy. Of course, each 256 Kbps link is going to cost me $650 per
> > month, so I need to make the best of them.
> 
> Redundancy from the beginning?  That's a wonderful start <smile>.
> 
> > Now the problem: I need the two links to give me redundancy (and ideally
> > load-balancing), but how the heck do I do that?
> 
> Very carefully <smile>.
> 
> > I *think* I need the following:
> > 
> > * Buy a router
> > * Contact ??? and get my own block of IP addresses
> > * Contact ??? and register as an Autonomous System
> > * Inform both ISP's of my addresses and set up routes
> > * Use BGP or ??? to route and load-balance
> 
> Yes to all of these above.  Join the "Internet Access List":
> 
> List archives can be found at: <http://www.moongroup.com/inet.php>
> Send 'subscribe' in the body to 'list-request@xxxxxxxxxxxxxxx' to
> subscribe.
> Eat sushi frequently.   inet@xxxxxxxxxxxxxxx is the human contact
> address.
> 
> And ask these questions there.  Welcome to the world of the "real" ISPs
> <smile>.
I can only say, I've done several test (during INTER-OPS) with
multi-homing and the consecus to all tests show 1 thing!!!

IT DOESN'T WORK IN PRACTICE!

There are places where it works (semi-works) but in the end you need to
set one access-ISP as primary and the other one as secondary, then get
your own AS, router and use BGP4 and use the IP-range from the secondary
ISP as your primary IP-range and get the first ISP to publish that range
through their AS and consequently breaking up the secondary ISP'S
CIDER-block... And then hope the secondary ISP set the cost of route
higher than the primary ISP otherwise it won't work...
What do we learn from this??? Do multi-homing, but with the same ISP but
to 2 different physical locations and hope the ISP has more than 1
connection to the Internet...

Politics is stronger than practice...
 
Rickard Osser
Manager
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