Why Mikrotik is not marked in the trace?

Question

network hardware

Hi friends.
There are 2 networks with Mikrotik and a fleet of machines.
When I trace one wheelbarrow from another, Mikrotik is not marked in it. What in the firewall settings can block it? icmp is not blocked. If you need to clarify something from the parameters - tell me what) Please help)

I also do not have tracing even when tracing to another zone (via GRE). Now from computer 192.168.101.51 I am tracing computer 192.168.102.51. Between them there are two microtics connected by a GRE tunnel via the Internet (192.168.101.1 and 192.168.102.1, respectively). There is only 1 (one) step in the trace - immediately comp 192.168.102.51. All.

Answer 1

Problem solved. Everything was banal and simple (although probably still not banal). On Mikrotiks (both), a rule was configured in Mangle with an increase in the TTL of all packets by 1 (apparently to mask it from the provider).