Re: Transperant HTTP Redundancy.

From: Javier Puche. CSIC RedIRIS <>
Date: Wed, 25 Mar 1998 10:56:52 +0100


 A very simple way of getting the redundancy you are looking for is:

- Set just one next-hop IP at the router. Let's say we have IP x.x.x.x
for the proxy-cache service.
- Have two or more machines in the same ethernet segment and IP subnet.
Let's call them 1 and 2.
- Have both machines with IP addresses different than x.x.x.x but with
the ability to listen to x.x.x.x with a virtual interface when needed.
- When machine 1 attending x.x.x.x falls down, have the other machine
(2) detect that situation and set up a virtual interface for attending
x.x.x.x , do it also the other way around.
- Make sure that if either machine goes up again doesn't listen to IP
x.x.x.x before checking that the other machine is not doing that

 I know how to set up virtual interfaces with Solaris and Linux via
ifconfig, I suppose most other unix flavors can also do it.


Javier Puche.
Received on Wed Mar 25 1998 - 02:03:06 MST

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