This article is contributed by @Cang_Household .
This article details some standard and advanced knowledge. The official support may not cover the knowledge detailed here. As usual, (the lawyers would argue that) you are responsible for all the changes made on your devices and plans. This article does not provide warranties of any kind. By following the knowledge detailed in this article, you agree to hold both the article authors and Verizon harmless.
Router Address Family Features
| Feature / Address Family | IPv4 | IPv6 | Models (G3100, CR1000A/B) |
| Static Routing | any prefix length, excluding quad zeros | No auto-update from /56 block changes *next hop better to be link-local | |
| Static NAT | netmap LAN IPv4 to WAN IPv4 | not supported | |
| Port Forwarding | TCP, UDP, +AH, ESP, GRE | only TCP, UDP, or both | |
| Multicast Querier | IGMPv3, 60 seconds | MLDv2, 125 seconds | CR1000A/B not sending MLDv2? |
| Multicast Snooping | ??? | ??? | Likely is flooding all unregistered multicast |
Gateway Router (GWR) IP Services
| IP Service / Address Family | IPv4 | IPv6 |
| Lease time | 2 hr | 2 hr |
| DHCP | one /24 address | one /56 block |
| Active MAC Limit | 1 | 1 |
| Active Lease Limit | 2 | 1 |
| DNS | two addresses, Cloudfare based | not provided, use IPv4 DNS |
Given these, it is theoretically possible to put a L2 switch after the ONT to separate the address family stacks. You can put one router that does IPv4 address family and another router that does IPv6 address family.
GWR will count based on address family how many active MACs it sees.