Fixed off by one

1 files changed, 4 insertions, 4 deletions

diff --git a/dhcpv6/option_nii.go b/dhcpv6/option_nii.go
index 1df1579..85c9d4b 100644
--- a/dhcpv6/option_nii.go
+++ b/dhcpv6/option_nii.go
@@ -39,10 +39,10 @@ func (op *OptNetworkInterfaceId) Code() OptionCode {
 func (op *OptNetworkInterfaceId) ToBytes() []byte {
 	buf := make([]byte, 7)
 	binary.BigEndian.PutUint16(buf[0:2], uint16(OPTION_NII))
-	binary.BigEndian.PutUint16(buf[2:5], uint16(op.Length()))
-	buf[5] = op.type_
-	buf[6] = op.major
-	buf[7] = op.minor
+	binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
+	buf[4] = op.type_
+	buf[5] = op.major
+	buf[6] = op.minor
 	return buf
 }