[c-nsp] Application issue over ISP

[Vincent C Jones]

On Mon, 2009-12-14 at 12:44 +0100, Peter Rathlev wrote:
> On Mon, 2009-12-14 at 19:57 +0900, Erik Fairbanks wrote:
> > On Sun, 2009-12-13 at 11:53 -0500, Vincent C Jones wrote:
> > > "Ping based routing" may do the job if your user application can
> > > tolerate changing public IP addresses.
> >
> > Out of curiosity, what is ping based routing?
> 
> I think Vincent means static routing with RTR/IP SLA tracking to
> invalidate a route if the next hop is unreachable. Cisco calls it
> "Reliable Static Routing Backup Using Object Tracking".
> 
> http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html

Correct. It has been marketed under a variety of names over the years by
Cisco and others. 

DISCLAIMER: I have not had a client with a need for this in years, but I
recommend testing carefully before putting any solution into production.
The last time I took serious look at using ping based routing (back when
Cisco had it under the "Response Time Recorder" umbrella) I found wide
variations in reliability and robustness between implementations,
including between releases from the same vendor, and we gave up on the
idea.

-- 
Dr. Vincent C. Jones, PE
Networking Unlimited, Inc.
Phone: +1 201 568-7810
V.Jones at NetworkingUnlimited.com