The upgrade of IP systems around the globe from version 4 to 6 is moving at snail-pace, despite the latter having been shown as superior in many regards. Nevertheless, adoption is happening in many places, with a number of advantages being cited as good reasons for the move. There are also some downsides to be aware of however; below are some of the main ones.
Most people link to IP addresses using domain names, while others bypass that bit and move straight to the address. Taking the latter route spares you the expense that comes with registering a domain, while also helping keep the network relatively hidden. IPv6 addresses, being much longer than ipv4 addresses, are also a lot harder to remember.
More Internet Traffic
Despite taking up very little space relative to media and websites, an IPv6 address can slow down address requests placed before a domain name server. On top of that, lots of pages link to external websites, which have their own addresses. Pulling those up as well can occupy more bandwidth. Users even end up spending more time writing down an IPv6 address than an IPv4 address, and often making mistakes while they are at it.
Most older networking devices carry no adaptability when it comes to moving to IPv6, and these are all that many businesses and organizations have. Getting them to the other side, so to speak, would require network hardware upgrades which run up the costs to impractical levels, especially for smaller businesses. Many businesses would also need to hire consultants to smoothen the transition.
Local Networking Changes
Local networking management usually covers the assignation of specific IP addresses to each device, which is very difficult to do manually. For that reason, many local networks prefer having an IPv4 addressing system for internal use, but that could easily cause confusion. In other words, bringing in IPv6 is bound to drag in complications in the local networking sphere.
Two IP Schemes
More confusion can occur when changing over to IPv6. If you have a high number of ISPs as well as other organizations eschewing it, you would need backwards compatibility, and also get saddled with the reality of juggling effectively dissimilar protocols, considering IPv4 is here to stay awhile longer.