Fasttrack not working on RB5009

[un9edsda]

Mangle and fasttrack are not compatible.

Even in the case of the NPTv6 pair of rules that @Sob has provided?

/ipv6 firewall mangle
add chain=postrouting action=snpt src-address=fd00:1234:5678:9a00::/56 src-prefix=fd00:1234:5678:9a00::/56 dst-prefix=publ:icpr:efix:b700::/56
add chain=prerouting action=dnpt dst-address=publ:icpr:efix:b700::/56 src-prefix=publ:icpr:efix:b700::/56 dst-prefix=fd00:1234:5678:9a00::/56

Which makes it possible to have stable (ULA) IPv6 addresses and multihoming on a SOHO network despite regularly changing IPv6 prefixes.