If I understand it correctly, this response is causing MikroTik router to give up and announce the entire prefix to be duplicate address and render IPv6 unusable.

I was able to see Neighbor Solicitation message going to ff02::1:ff0:0 for entire /64 prefix assigned by LMT and one device responding with Neighbor Advertisement confirming that it has this prefix assigned. Downloaded packet dump and opened in Wireshark. Logs (including radvd logs) didn't show anything suspicious when issue occurred.įinally, I decided to analyze network traffic and set /tools/sniffer/filter-ip-protocol to icmpv6 and started packet sniffer and restarted lte interface (causing the router to re-negotiate IPv6 address). Called LMT support, but they didn't see any issue on their side. Sometimes I'm able to fix it by restarting MikroTik router and sometimes it doesn't help and I manage to fix it by disabling lte interface and enabling it few minutes later.

Lately (for several months) I'm facing an intermittent problem: IPv6 connectivity stops working due to Duplicate Address Detected issue: 2a03:xxxx:xxxx:xxxx::/64 address (assigned by LMT) gets DIG status (I meaning invalid) and 'Duplicate Address Detected' error. I have LMT 5G MikroTik router and a static IPv6 /64 prefix assigned by LMT (provider in Latvia).

Mikrotik sniffer wireshark