"First, we ran into an issue where our FreeBSD content cache appliances, processing a significant amount of IPv6 traffic (in some cases, 8Gbps), would eventually panic and hang. We found a reference leak in the IPv6 code that wasn't apparent until you had processed 2^32 packets."
The ISPs’ costs, however, to deliver a marginal gigabyte, which is about an hour of viewing, from one of our regional interchange points over their last mile wired network to the consumer is less than a penny, and falling, so there is no reason that pay-per-gigabyte is economically necessary. で