[inconshreveable]

ngrok's value is for services that don't have public IP addresses (anything behind a NAT or firewall)

[ghayes]

Can IPv6 address help address this issue in some circumstances?

[inconshreveable]

Certainly, although even with complete adoption of ipv6, i suspect we'll still see most networks locked down to prevent incoming connections

[jdeb]

It will definitely be interesting to see how public internet providers (airports, coffee shops, etc) handle IPv6 in the future. Will they leave their LAN_IN firewall open and leave filtering to the client, or will we keep the status quo and filter at the router?