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@{ $netifaces->{ $_ } }{ @nets } = (1) x @nets for @eths;
   ^^^^^^^^^^ a hash reference
...

@{ ... }{ @nets } = (1) x @nets ...;
       is assigned ^ ^^^^^^^^^^^ a list of '1's the size of @nets

@{ $netifaces->{ $_ } }{ @nets } = (1) x @nets for @eths;