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List:       inet-access
Subject:    Re: web caching
From:       Ivan Kohler <ivan-inet-access () sisd ! com>
Date:       1999-04-30 22:07:46
[Download RAW message or body]

On Fri, Apr 30, 1999 at 02:58:12PM -0400, Eric Stern wrote:
> On Thu, 29 Apr 1999, Ivan Kohler wrote:
> 
> > On Wed, Apr 28, 1999 at 06:42:32PM -0600, Travis Johnson wrote:
> > > >
> > > > > > 3minutes?  That is nothing to brag about.  Most l4 switches can do it in
> > > > > > seconds.
> > > > > >
> > > > >
> > > > > nope, but it is better than nothing, and MUCH cheaper than a L4 switch :)
> > > >
> > > > how does it work then?  If users are set to point to ip address "A", and
> > > > the machine "A" blows up.  How are they automagically directed to ip
> > > > address "B"?  Does your redundancy depend on the operating system still
> > > > functioning?
> > > >
> > > 
> > > The second machine "assumes" the IP address of the failed machine... :)
> > 
> > What do you do if the original machine doesn't crash hard, but reboots?
> 
> Same question as "what happens when you fix the original and turn it back
> on?" And the answer is, the second machine will detect the original
> machine coming back up and stop "assuming" its address. Everything goes
> back to normal.

Specifically, how?

Detecting an IP address going away is easy; ping or similar, then ifconfig
the new IP address up locally.

How do you detect it coming back?

(Perhaps you can use a non-duplicate `base' IP address for each machine,
and have them alias any IP a customer would connect to... but I'm asking
how *you* are doing it.) 

-- 
Ivan Kohler <ivan@sisd.com> - finger for PGP key - <moc.dsis@navi> Relhok Navi
Open-source billing and administration for ISPs - http://www.sisd.com/freeside
20 4,16 * * * saytime # please don't be surprised if you find me dreaming too
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