That is the Mikrotik Neighbor Discovery Protocol (MNDP). Of course, it should be turned of for tunnel interfaces (it is enabled by default on all interfaces). 73s de Marius, YO2LOJ -----Original Message----- From: 44net-bounces+marius=yo2loj.ro(a)hamradio.ucsd.edu [mailto:44net-bounces+marius=yo2loj.ro@hamradio.ucsd.edu] On Behalf Of Don Moore Sent: Saturday, April 11, 2015 15:25 To: AMPRNet working group Subject: [44net] (no subject) (Please trim inclusions from previous messages) _______________________________________________ Whoever owns 44.131.160.1 you need to check your system configuration. It cannot do anything with 255.255.255.255 Below what I am seeing 8:20:25.632390 IP 81.174.253.193 > 192.168.1.150: IP 44.131.160.1.5678 > 255.255.255.255.5678: UDP, length 120 (ipip-proto-4) 08:20:25.635667 IP 192.168.1.150 > 81.174.253.193: IP 44.135.90.2 > 44.131.160.1: ICMP host 255.255.255.255 unreachable, length 36 (ipip-proto-4) -- cheers, Don ? - ve3zda-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://hamradio.ucsd.edu/mailman/private/44net/attachments/20150411/bd873efb/attachment.html> _________________________________________ 44Net mailing list 44Net(a)hamradio.ucsd.edu http://hamradio.ucsd.edu/mailman/listinfo/44net