Re: Clustering - how can I.......

What could be done is an RTR like system.

system 1 has THE IP that the router sends all HTTP transactions to.
system 1 then forwards the transaction to the least busy of the other 2
machines.

But you end up with a lot of overhead.

In the end, if you have a simple router, it is likely you'll have a
simple DSL line to feed your cluster, and chances are that even an all
mightly microvax II would have no problem service HTTP requests on that
line.


The way Failsafe IP works: when node X wants to take over the failsafe
ip 10.0.0.50, it sends a gratuitous ARP broadcast, hoping all machines
on the LAN will update their ARP table so that the next packet they need
to send to 10.0.0.50 gets sent to the new ethernet address.

(This happens to not work on my router, but it is just a netgear)

You can't really dynamically switch this easily. Consider some remote
user sending you a large picture as part of an HTTP request. This will
consist of a large number of TCPIP packets. If you change the ARP entry
midway, it means that the new host will start receiving the second half
of the transaction without any idea of the first half, and of course,
with no context on that TCPIP link.

.

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