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Re: Alternative to BGP-4 for multihoming?
- From: Alex Pilosov
- Date: Wed Mar 01 15:49:43 2000
On Wed, 1 Mar 2000, David Israel wrote:
> The documentation is pretty vague on a few points, but it looks like
> all it does is NAT and (possibly, it's very bague on this point) resolve
> DNS for servers based on what it thinks is the best path to use. There's
> just a static route on your side; the customer gets a network from each
> ISP, and the LinkProof NATs to whichever network it thinks is best.
> Good points: He isn't peering with you. You don't need to do anything
> to support this. Just statically route him and let him do the rest.
> Bad points: He asked if you support it; ergo, he doesn't know how it
> works. Prepare your NOC/customer service folks for this guy to call
> in and bitch if the thing fails. It's also wasteful of IP addresses
> if the guy's got a big network back there, since he has to number
> every machine seperately for every connection he's got. Lastly, they're
> really vague in the online docs on how, exactly, they redirect traffic
> going to the customer. They just say they redirect it, and later say that
> the box will be "taking responsibility for... DNS support for resources
> that need to be accessed from the Internet." Sounds iffy to me.
> In short, if it were my customer, I'd say something like, "It's your
> funeral. Have a ball." Only I'd say it nicely.
Oy. This stuff seems similar to what I ran on my home network(NAT plus
smart DNS servers that gave out IPs on the links that were up). It worked
semi-decent, only that failover sometimes took ages because of all the DNS
caches in the world which don't care which TTL you set, or have a notion
of 'minimal TTL' below which they won't accept your records, end clients
caching records infinitely (well, until the next reboot/app restart).
All in all, I'd say it works in 95% of cases, and certainly good enough
for home network, but using it in enterprise connectivity is silly.
Alex Pilosov | http://www.acecape.com/dsl
Acecape, Inc. | AceDSL:The best ADSL in Bell Atlantic area
325 W 38 St. Suite 1005 |
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