The newer addressing.
WHY IT EXISTS
IPv4 addresses ran out.
WHAT IT PROVIDES
Enough addresses for every device, removing the need for sharing.
WHAT THAT CHANGES
Devices can have globally routable addresses.
WHAT THAT MEANS PRACTICALLY
Address sharing becomes unnecessary Some applications work more directly Filtering becomes more important, since devices are directly addressable
THAT LAST POINT
Without address sharing, a firewall does the work that sharing did incidentally.
WHAT TO CHECK
Whether your provider offers it Whether your equipment supports it Whether your services are reachable over it
WHAT MOST SMALL BUSINESSES NEED TO DO
Little, for now.
Both run alongside each other.
WHAT TO ENSURE
That your firewall applies to both.
A rule set covering only the older protocol leaves a gap.
WHAT TO TEST
Whether your site is reachable over both, if you have enabled it.
WHAT NOT TO DO
Enable it without configuring filtering.
