Mikrotik TCP MSS Dynamic

[admin@MikroTik] /ip firewall mangle> print
Flags: X - disabled, I - invalid, D - dynamic
 0  D chain=forward action=change-mss new-mss=1410 passthrough=yes tcp-flags=syn
      protocol=tcp out-interface=all-ppp tcp-mss=1411-65535 log=no
      log-prefix=""

 1  D chain=forward action=change-mss new-mss=1410 passthrough=yes tcp-flags=syn
      protocol=tcp in-interface=all-ppp tcp-mss=1411-65535 log=no log-prefix=""