[c-nsp] Fwd: Load Balancing two different ISP's

[Joe Maimon]

Chris Hale wrote:

> Only way to get close without BGP is to use a Fatpipe or Radware Linkproof
> box of some sort.
> 
> It's basically DNS trickery (IMHO) by shortening the TTL on the IPs you
> advertise through DNS.
> 
> Chris

There is another way.

Ask each ISP to each to do a fallback GRE tunnel terminated at the CPE's 
other connection to the router.

You could also evolve this by arranging the tunnels with a third ISP if 
neither ISP is cooperative.

In such a situation, you would use the third ISP's /29, which would be 
balanced and redundant across both links.

Use policy routing so that only /29 traffic needs to be routed over the 
tunnel, the rest can be natted directly at the CPE. Hint: route-map and 
match interface.