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Re: RADWare Linkproof? (or better ways to multihome)

  • From: Mike Johnson
  • Date: Wed Nov 01 14:27:11 2000

Brantley Jones [[email protected]] wrote:
> Mike,
> I know exactly what you're talking about.  How much does the Linkproof 
> cost?  It could come down to a cost issue.  Looking at the Linkproof 
> documentation, it looks like you MAY still need a router.  It sounds like 
> the Linkproof is just a smart NAT box with some QOS features.  Are you 
> going to be advertising your IP block to both providers?  If one goes down, 
> will you still be routable globally?  If not, how could the Linkproof 
> possibly handle that?

The cost issue is one reason why I'm shopping around.

1 RADWare Linkproof: $10k list (we would buy two for redundancy)
1 Cisco 7206VXR/NPE300 with four Fast e-net links: $33k

I'm beginning to wonder if the 7206 is overkill for our needs.

Our connections will be via fast ethernet, so we don't need any serial
cards.  The LinkProof would esentially look like and endpoint node
on each of the two provider's networks.  It can act as a router,
albeit without OSPF or BGP (it'll do RIP).

We're not planning on getting our own IP block, rather we'd get one
block from each of the providers.  The LinkProof relies heavily on
DNS.  Assuming both providers are up, it sends out the IP address
that it thinks would get the client to the site the fastest.  IE,
if our site has connections with ISP A and B, and you come in through
B, the LinkProof tries to figure out if a path back through B is
fastest, or if A might be fastest.  It then responds with the IP
address (related to my DNS records) on A or B, depending on which
it thinks is best.  If B is down, the LinkProof will know this (it
monitors link state) and will only respond to DNS queires with IPs
from A.

So, it can handle it, but it does so with DNS tricks.  DNS tricks
won't always work, but for at least 75% of the clients that will
be connecting to us, DNS tricks should work.  And in this instance,
when DNS tricks fail, our site is still reachable, but it might
not be the best route. 
> Brantley

Mike Johnson
Network Engineer / iSun Networks, Inc.
Morrisville, NC
All opinions are mine, not those of my employer