Mikrotik, mtr. Why are packets lost on the first hop?

Question

Ping

Gateway with three providers. Balancing using ECMP (equal cost multipath routing). All fw deny rules are disabled.
mtr ya.ru (1 ICMP packet passes. The rest is loss)

...
mtr -u ya.ru (all the rules on udp)

Guru, help me figure out why it is and how to overcome this?

Answer 1

Probably something is wrong with the routes and the response comes (in the end) from a different address of this router (or does not come at all). The first fails, because the packet is addressed specifically to the address of the router, the rest fall off, since they already pass through it and the answer to them is not direct.

Answer 2

because of what it

The router seems to have more important things to do than generate responses to ICMP requests (if mtr sends them, of course). Or it has a special function to limit such traffic in order to minimize the likelihood of a denial of service (DoS) situation.

how to overcome it?

If this does not affect the working traffic, then there is no need to deal with it.