I'm looking looking for information related to seemingly random log messages that I've started to see on one of our C150's.

Jul 29 21:59:35 AST : Fib6Spf_ProcNbr: NDPM sent Nbr deletion msg for Nbr a00:1:: with incorrect flag 6
Jul 29 21:59:35 AST : Fib6Spf_ProcNbr: NDPM sent Nbr deletion msg for Nbr d876:9cb7:: with incorrect flag 6
Jul 29 21:59:35 AST : Fib6Spf_ProcNbr: NDPM sent Nbr deletion msg for Nbr cceb:d00d:: with incorrect flag 6
Jul 29 21:59:35 AST : Fib6Spf_ProcNbr: NDPM sent Nbr deletion msg for Nbr cceb:d00b:: with incorrect flag 6

The messages appear to indicate Network Data Management Protocol traffic but I haven't been able to find the source.

 Does anyone have any more information on this or how I could track down where this traffic is coming from?