Issues

Per-address notification, not per-port
Okay since TCP to anycast is always disallowed
Security
Malicious router can disconnect any TCP session
Problem is in ICMP, not new
Future update in anycast to allow TCP?
Implementations MUST make a flag to disable this

Need your experience for non-BSD TCP
Experiments welcome, at terminal room

UDP6 suffers from this problem too...
Example: nameserver on anycast addr