So there are no technical limitations prohibiting the intentions of the
original poster. One man's "unnatural" is another man's knowing when or
when not to violate a rule of thumb. The latter being a non-technical
consideration. If the networking people are worth their salt, IMO, they
would code both the old subnet and the new subnet on the switch port
anyway to allow a graceful migration of the guests from the old subnet
to the new subnet so that a "flash cut" of the network and all guests
are not required at one time. That would certainly allow the new guests
to be immediately implemented while the old ones migrate on their own
schedule to the new subnet. Then the only question would really be, does
the old subnet go away or stay, a potentially separate question.

Harold Grovesteen

Alan Altmark wrote:

On Tuesday, 04/05/2005 at 08:27 EST, Harold Grovesteen
<[EMAIL PROTECTED]> wrote:


In a purely switch based networking configuration, mutliple subnets may
be defined on a single broadcast domain even if it is accessed by a
single access port (non-VLAN). The default gateway would need to be
configured with addresses for both subnets and for devices on the same
broadcast domain with different subnet addresses to communicate they
would need to go through the default gateway. Admittedly, this violates
the rule of thumb of one subnet per broadcast domain but is supported by
the technology.

What is the source of this restriction?



There isn't really a restriction, but it requires an ... unnatural ... configuration, liable to cause more problems than it solves. The problem areas will be getting it past the network security folks and routing.

Alan Altmark
z/VM Development
IBM Endicott

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