We were able to restore IPv4 and IPv6 connectivity. Performance is still not optimal, and connections are occasionally dropping. We've taken measures to try and maintain uptime overnight (with a certain probability).
Routes protected by iocaine (crawler protection) may return 503 errors. Currently, it appears that these packets are also occasionally being lost.
It's 2:30am, and we require a good night's sleep before we can look into this further.