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Is there a way with pf to block specific type of packets larger than specific size?

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up vote 3 down vote accepted

AFAIC, pf can't do this. You can use ipfw's iplen option:

 iplen len-list
         Matches IP packets whose total length, including header and data,
         is in the set len-list, which is either a single value or a list
         of values or ranges specified in the same way as ports.
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