if addr == nil {
		return 0, 0, errMissingAddress
	}
	sa, err := addr.sockaddr(c.fd.family)
	if err != nil {
		return 0, 0, err
	}
	return c.fd.writeMsg(b, oob, sa)
}

func (sd *sysDialer) dialIP(ctx context.Context, laddr, raddr *IPAddr) (*IPConn, error) {
	network, proto, err := parseNetwork(ctx, sd.network, true)
	if err != nil {
		return nil, err
	}
	switch network {
	case "ip", "ip4", "ip6":

		} else {
			c, err = sd.dialTCP(ctx, la, ra)
		}
	case *UDPAddr:
		la, _ := la.(*UDPAddr)
		c, err = sd.dialUDP(ctx, la, ra)
	case *IPAddr:
		la, _ := la.(*IPAddr)
		c, err = sd.dialIP(ctx, la, ra)
	case *UnixAddr:
		la, _ := la.(*UnixAddr)
		c, err = sd.dialUnix(ctx, la, ra)
	default:

		{"DNSError.IsTemporary", Field, 6},
		{"DNSError.IsTimeout", Field, 0},
		{"DNSError.Name", Field, 0},
		{"DNSError.Server", Field, 0},
		{"DefaultResolver", Var, 8},
		{"Dial", Func, 0},
		{"DialIP", Func, 0},
		{"DialTCP", Func, 0},
		{"DialTimeout", Func, 0},
		{"DialUDP", Func, 0},
		{"DialUnix", Func, 0},
		{"Dialer", Type, 1},
		{"Dialer.Cancel", Field, 6},
		{"Dialer.Control", Field, 11},