On the qmail list [EMAIL PROTECTED] wrote:
>On Sun, 16 Jan 2000, Mike wrote:
>
>> If I set this up in DNS, what would happen if an outgoing server in the
>> cluster went down? Also how effective would the load balancing be?
>> >
>> > Then, initialize your DNS server and put 10 A records for this hostname.
>> > Each individual message will then be sent to a randomly chosen IP address,
>> > one out of 10, balancing the load.
[...]
>Note that most TCP/IP stacks will allow you to bind multiple IP addresses
>
>Of course, that machine will now get twice its regular load, so this
If you have lots of IP addresses to waste and nothing better to
do with your time than write administration scripts, you could
assign, say, 3 IP addresses to each server. That's a /24. Then
if one falls down, three others can share the load.
However, if nobody has a reliable free solution to do TCP-level
load balancing (nobody has done that??), there are $$$
solutions. To quote another one, FireWall-1 will permit what
you want. If you have to get a FW-1 for another reason, which
I agree is a big "if", that might be the way to go. But the
hardware solution would probably be more reliable, simply from a
hardware point of view (who wants to bet a large percentage of
FW-1 installations are on cheapo PC hardware?)
