2 files changed, 24 insertions, 20 deletions
diff --git a/dhcpv6/option_4rd.go b/dhcpv6/option_4rd.go
index 13d672a..d9ac0a4 100644
--- a/dhcpv6/option_4rd.go
+++ b/dhcpv6/option_4rd.go
@@ -8,7 +8,9 @@ import (
 )
 
 // Opt4RD represents a 4RD option. It is only a container for 4RD_*_RULE options
-type Opt4RD Options
+type Opt4RD struct {
+	Options
+}
 
 // Code returns the Option Code for this option
 func (op *Opt4RD) Code() OptionCode {
@@ -17,20 +19,20 @@ func (op *Opt4RD) Code() OptionCode {
 
 // ToBytes serializes this option
 func (op *Opt4RD) ToBytes() []byte {
-	return (*Options)(op).ToBytes()
+	return op.Options.ToBytes()
 }
 
 // String returns a human-readable representation of the option
 func (op *Opt4RD) String() string {
-	return fmt.Sprintf("Opt4RD{%v}", (*Options)(op))
+	return fmt.Sprintf("Opt4RD{%v}", op.Options)
 }
 
 // ParseOpt4RD builds an Opt4RD structure from a sequence of bytes.
 // The input data does not include option code and length bytes
 func ParseOpt4RD(data []byte) (*Opt4RD, error) {
-	var opt Options
-	err := opt.FromBytes(data)
-	return (*Opt4RD)(&opt), err
+	var opt Opt4RD
+	err := opt.Options.FromBytes(data)
+	return &opt, err
 }
 
 // Opt4RDMapRule represents a 4RD Mapping Rule option
diff --git a/dhcpv6/option_4rd_test.go b/dhcpv6/option_4rd_test.go
index 1251b13..ad72445 100644
--- a/dhcpv6/option_4rd_test.go
+++ b/dhcpv6/option_4rd_test.go
@@ -141,22 +141,24 @@ func TestOpt4RDMapRuleString(t *testing.T) {
 func TestOpt4RDRoundTrip(t *testing.T) {
 	var tClass uint8 = 0xaa
 	opt := Opt4RD{
-		&Opt4RDMapRule{
-			Prefix4: net.IPNet{
-				IP:   net.IPv4(100, 64, 0, 238).To4(),
-				Mask: net.CIDRMask(24, 32),
+		Options: Options{
+			&Opt4RDMapRule{
+				Prefix4: net.IPNet{
+					IP:   net.IPv4(100, 64, 0, 238).To4(),
+					Mask: net.CIDRMask(24, 32),
+				},
+				Prefix6: net.IPNet{
+					IP:   net.ParseIP("2001:db8::1234:5678:0:aabb"),
+					Mask: net.CIDRMask(80, 128),
+				},
+				EABitsLength:  32,
+				WKPAuthorized: true,
 			},
-			Prefix6: net.IPNet{
-				IP:   net.ParseIP("2001:db8::1234:5678:0:aabb"),
-				Mask: net.CIDRMask(80, 128),
+			&Opt4RDNonMapRule{
+				HubAndSpoke:  true,
+				TrafficClass: &tClass,
+				DomainPMTU:   9000,
 			},
-			EABitsLength:  32,
-			WKPAuthorized: true,
-		},
-		&Opt4RDNonMapRule{
-			HubAndSpoke:  true,
-			TrafficClass: &tClass,
-			DomainPMTU:   9000,
 		},
 	}