Method: NetAddr::IPv4#multicast_mac

Defined in:
lib/ipv4.rb

#multicast_mac ⇒ Object

multicast_mac returns the EUI48 multicast mac-address for this IP. It will return the zero address for IPs outside of the multicast range 224.0.0.0/4.



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# File 'lib/ipv4.rb', line 45

def multicast_mac
	mac = 0
	if (@addr&0xf0000000 == 0xe0000000) # within 224.0.0.0/4 ?
		# map lower 23-bits of ip to 01:00:5e:00:00:00
		mac = (@addr&0x007fffff) | 0x01005e000000
	end
	return EUI48.new(mac)
end