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In several parts of the Mikrotik API Manual there are references to the passthrough=no and passthrough=yes.

Manual: Transparent Traffic Shaper
Manual: "/ ip firewall mangle"

But nowhere have I seen a complete description of what this attribute does! Can someone link to documentation or give a complete description of the behavior of this attribute?

(Please note that I am NOT referring to the similarly named action: action=passthrough.)

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In my experience, when you use passthrough=yes, for example in a mangle rule, then the packet if it gets matched by that rule it's processed by the subsequent rules.

Where in case you use passthrough=no, if the packet gets matched by that rule, it will not get processed by the subsequent rules which can be useful to save some CPU as stated at the bottom of the manual page you posted.

There are certain types of configurations that passthrough=yes is needed, but in most cases I believe that it's safe to use passthrough=no unless you need otherwise.

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In the older 2.9 version of the Documentation there is a reference to the passthrough option. passthrough (yes | no; default: yes) - whether to let the packet to pass further (like action passthrough) after marking it with a given mark (property only valid if action is mark packet, connection or routing mark) – Cha0s May 26 '13 at 16:48

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