yes, and this is strange, when start dc, on new IP, ...
look like udp known where he is, and packages end (punch) on his machine, and link back to 1000p/s.
one more thing, all UDP coming from internet, but packages are 3000p/s only between MT2-MT3, ... ?!
this is strange, why packages not increase on all link ... internet-MT1-MT2-MT3 ?
we have this problem 4-5 month ago , on otherone link to, packages go to 5000p/s , and 30mbps+ on link, and cpu go to 100%. we did not known at this time what is happend, we reboot this 2 router and packages stop, back to normal.
and strange this happend only between 2 MT , deep in network, but traffic comming from internet ?!
network have all public IP, MT to, but all service on all MT are OFF , only work winbox port, and MT discovery, and in log there is no stragne login to ruters.
btw, we have approximate 30 link in network, and this happend only on 2-3, but many users have p2p, and without prohibit, ... like you tell, strange to.
btw2, all router are 2.9.49