Hi all .
My openwrt wan6 use dhcpv6 and conntected to isp's lan port which have statefull enable.
Isp give ipv6 prefix /56, and openwrt get ipv6 address and ipv6 prefix /64, all clients in br-lan work fine .
But when isp changed ipv6 prefix, openwrt wan6 get new ipv6 prefix and all clients get new ipv6, that's fine .
The problem is: the openwrt wan6 lost ipv6 address. the old ipv6 prefix also keeped. and br-lan also keeped old ipv6 address and old prefix. all clients also keeped old ipv6 address.
Isp lan port donnot keep old ipv6 address. So my clients has connection problems when using ipv6 address.
The old prefix and address should delete.
I have to restart network to make openwrt and every client to update new ipv6 address.