Allows connections from :attr:`source_cidr`.

        :param str source_cidr:  The source IP range from which to allow
            connections.

def grant(self, source_cidr):
        """
        Allows connections from :attr:`source_cidr`.

        :param str source_cidr:  The source IP range from which to allow
            connections.

        """
        self.manager.api.secgroup_rules.create(self.id, source_cidr)