Hi,
I want to investigate a problem with ipv6-prefixes that change when changing the mtu of an interface in ND (neighbor discovery). At least that’s what I want to prove, because I think that’s what I experienced when doing so.
I don’t want to do that on my live router, because that did mess up my network 
. And mikrotik wants a config from before and after.
I have a spare hEX and I would like it to behave like it got a /56-prefix from the isp, and I want to hand out /64-addresses with slaac. Without connecting the wan-port to the isp.
Any references I could read ?
Thanks.