From: Sanford Reed=20
> 2. DNS - This is where most of the problems lay. Due to the time=20
> (3 to 5 days) needed for DNS changes to propagate you could=20
> have some connectivity issues unless you can 'mirror' the=20
> Public services onto both address subnets for a short period.=20


Or plan enough ahead (i.e. greater than your current TTL) and lower the
TTL in your affected DNS zones to make the propagation faster (at the
expense of more DNS queries due to the lower TTL).

Jeff
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