[Cialug] Re: MAC addresses

[Dave Weis <djweis@xxxxxxxxxxxx>]

On Fri, 5 Apr 2002, Dave Hala wrote:
> That's interesting. I never thought of doing it that way. With the
> directed/nat type of clusters, they a use a "heart beart" accross the net to
> see if the server is alive, then direct the traffic via nat to a living a
> server.
> On the HA systems, how to they do know if a server has died?

check out www.linux-ha.org. there is a heart beat mechanism, either via
ethernet or serial. there's another protocol called vrrp that uses
multicast.

dave

> ----- Original Message -----
> From: "Daniel Wittenberg" <daniel-wittenberg@starken.com>
> To: <lug@cialug.org>
> Sent: Friday, April 05, 2002 9:25 AM
> Subject: [Cialug] Re: MAC addresses
> 
> 
> > typically I've seen this done on HA systems (High-Availability), so when
> > one system fails, the other takes it's MAC and IP and all is good...
> >
> > Dan
> >
> >
> > On Fri, 2002-04-05 at 08:52, edwardc wrote:
> > > Yea, I'd agree with the collision aspect.  Spoofing a mac address on a
> > > networked system would only lead to headaches for the admin.  So, while
> it's
> > > possible, it's more of a headache than calling up your isp and changing
> the
> > > mac address with them.  Of course, there's no problem if you are
> replacing a
> > > burned card or dead router.
> > >
> > > ed
> >
> >
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-- 
Dave Weis             "I believe there are more instances of the abridgement
djweis@sjdjweis.com   of the freedom of the people by gradual and silent
                      encroachments of those in power than by violent 
                      and sudden usurpations."- James Madison

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