The documentation says:

ethset

is a method for set an ethernet parameters in the current object. The given parameters must look like parameters for the ethnew without a $device.

So for your manipulation, it expects the new header to be given in the ethset call as ip => { header keys and values }

update: you might also want to check whether your calls are returning a true value i.e.

$n->methodname(parms)
    or die "Net::RawIP->methodname failed";

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In reply to Re^3: Net::RawIP question by anonymized user 468275
in thread Net::RawIP question by mark200

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