Why dual-stack is its own topic
CGNAT still multiplexes thousands of homes onto one public IPv4. IPv6 can give your CPE a unique prefix — but many earn clients still prefer Happy Eyeballs toward IPv4, or brands score only the v4 reputation they already know.
Pair with fiber-vs-dsl-earn-rates-europe-2026 and isp-fair-use-bandwidth-europe-2026; stacking noise is dual-bandwidth-app-same-ip-stacking-conflicts-europe-2026.
Dual-stack hygiene checklist
IPv6 uniqueness does not erase a polluted CGNAT IPv4 neighbour graph overnight.
- Confirm WAN mode: dual-stack vs DS-Lite vs CGNAT-only in the ISP modem UI
- From the earn device, visit an IP-echo that shows both v4 and v6; note which address the browser used
- If the earn app has a “connection type / IP quality” panel, screenshot before and after router reboot
- Avoid forcing VPN/IPv6 tunnels that exit on datacenter space — vpn-while-earning-online
- One calm stack per household IP reputation — shared-ip-household-bandwidth-2026
- After ISP “IPv6 enable” tickets, expect a cool-down before rates recover — isp-throttle-cool-down-staged-restart-europe-2026
When rates still look limited
Public IPv4 add-ons remain a last resort after hygiene — see cgnat-vs-public-ip-earn-rates-europe-2026. Overnight stacking on the same LAN still shares reputation regardless of v6 prefix length.
Document ISP plan name + dual-stack status in your notes so future support chats are factual.
Tonight
Echo both IPs from the earn PC; note v4 shared vs v6 prefix; screenshot the earn quality panel. Hub: /guides/bandwidth-safety/. Start: /en/start/.