6to4: easing the IPv6 transition
6to4 for labs; native dual-stack for database endpoints you care about.
6to4 gives IPv6 connectivity from public IPv4 via automatic tunnels — useful when native prefixes are unavailable.
Fine for
- Lab dual-stack experiments
- Early “can monitoring speak IPv6?” checks
Not for primary OLTP paths
Public 6to4 relays are an availability lottery. Prefer native dual-stack or a tunnel broker you control.
Database notes
- Grants and
bind-addressmust match the protocol clients use - Replication must not silently prefer a flaky 6to4 path
- Label experimental interfaces as such
Bridge for learning. Do not stake primary database endpoints on relays you do not operate.