/ip firewall mangle add action=change-mss chain=forward disabled=yes new-mss=1260 out-interface-list=Tunnel passthrough=yes protocol=tcp tcp-flags=syn \ tcp-mss=1261-65535
/ip firewall mangle add action=change-mss chain=forward disabled=yes new-mss=1260 out-interface-list=Tunnel passthrough=yes protocol=tcp tcp-flags=syn \ tcp-mss=1261-65535
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