Method: NetAddr::IPv6Net#summ

Defined in:

lib/ipv6net.rb

#summ(other) ⇒ Object

summ creates a summary address from this IPv6Net and another. It returns nil if the two networks are incapable of being summarized.

# File 'lib/ipv6net.rb', line 202

def summ(other)
	if (!other.kind_of?(IPv6Net))
		raise ArgumentError, "Expected an IPv6Net object for 'other' but got a #{other.class}."
	end
	
	# netmasks must be identical
	if (self.netmask.prefix_len != other.netmask.prefix_len)
		return nil
	end
	
	# merge-able networks will be identical if you right shift them by the number of bits in the hostmask + 1
	shift = 128 - self.netmask.prefix_len + 1
	addr = self.network.addr >> shift
	otherAddr = other.network.addr >> shift
	if (addr != otherAddr)
		return nil
	end
	return self.resize(self.netmask.prefix_len - 1)
end