What is this viewqwest newly created private ip?
Just trying to recontract with them, and they r charging now for static ip. Base on the customer service, the account will be under private ip if we opt out, will be unable to do any port forwarding.
so private ip is worst than a dynamic ip?
Private IP is CGNAT, and is much worse than dynamic IP.
Dynamic IP assigns an IP to your router, you control and have exclusive use of that IP until it changes - it might take days, weeks or even months before it changes. A static IP is the same, except that it won't change.
Under CGNAT, Instead of your devices sharing an IP assigned to your router, multiple customers now share an IP assigned to a router (cgnat gateway) operated by the ISP, located in one of their data centres outside of your control.
Because the router is operated by the ISP, you have no control over it and you cannot open up inbound ports. You cannot host any services, and you cannot fully use p2p protocols - if only one user uses CGNAT then that user can connect to the non-cgnat user, but if both users are stuck behind cgnat then you can't communicate directly with them. The more users are moved to cgnat, the worse this becomes until eventually p2p becomes totally impossible.
Because the IP is shared between multiple customers, if one of those customers gets it blacklisted then all users will be affected. Similarly with sites that allow a limited number of connections or downloads per IP - if another customer uses the slots, there are none left for you.
Because the IP is shared, you won't be able to use IP whitelisting on any services hosted elsewhere - as if you whitelist the shared IP, you will be allowing all customers of the ISP not just you.
The CGNAT gateway is an extra device in addition to the routers the ISP already has, it is also more complex and more expensive. It will likely be a performance bottleneck, and causes the ISP to incur additional cost (they will try to balance cost vs performance). The only reason such devices are used at all, is because the cost of IPv4 is now often even higher than the cost of buying and operating such devices.
CGNAT is bad, but it will become increasingly required until everything moves to IPv6. IPv6 is the proper solution, CGNAT is a temporary kludge required to keep legacy IPv4 working. The more the rollout of IPv6 is delayed, the more pain people are going to suffer as they are increasingly forced onto CGNAT. In some countries, CGNAT is already the only option available to consumers.
