Just configured a wAP LTE and a cAP AC behind it. The wAP gets an IPv6 prefix from the ISP. Two things that aren’t too clear to me:
If I add multiple addresses from the same prefix to the same interface, why is the route shown as reachable n times the number of addresses the interface has?
I just came to this because of adding the second IP address (2001:4bb8:248:2868::1/64), as the cAP AC says the first address (2001:4bb8:248:2868::/64) is NOT in the same subnet as it’s own address (2001:4bb8:248:2868::251/64), while the second address is…
Haven’t had the best sleep last night, so am I missing something here?
2001:4bb8:248:2868::/64 is a network address (similar to aaa.bb.cc.0/24 in IPv4) do setting this address as host address is invalid (ability to set it anyway is a bug, but then lots of IPv6 implementation in current ROS is buggy).
Well, not a network address like in IPv4, but a Router Anycast address, according to RFC 4291. I’m just wondering about this implementation, as MikroTik assigns this address itself (maybe 1 might be better), but a MikroTik “Client” says it is unreachable, although it is not. Technically it is on the same subnet, but as mentioned before, it’s an Anycast address?!
When the wAP connects to LTE, it receives the prefix via RA and assigns it to the interface selected in the APN config, but as 0.
Besides that I have seen the same behavior with PD, but as there have been additional issues a case is open regarding the DHCPv6 problems. Anyway, with the exact same config as you mentioned it also assigned a 0 address (6.44.5).
