diff --git a/impacket/dcerpc/v5/drsuapi.py b/impacket/dcerpc/v5/drsuapi.py
index ecb6500bc4..b6eb72cdc8 100644
--- a/impacket/dcerpc/v5/drsuapi.py
+++ b/impacket/dcerpc/v5/drsuapi.py
@@ -234,6 +234,43 @@ def dump(self, msg=None, indent=0):
 DRS_EXT_RESERVED_FOR_WIN2K_OR_DOTNET_PART2 = 0x40000000
 DRS_EXT_RESERVED_FOR_WIN2K_OR_DOTNET_PART3 = 0x80000000
 
+
+class DRS_EXTENSIONS_INT_FLAGS(Enum):
+    DRS_EXT_BASE = 0x00000001
+    DRS_EXT_ASYNCREPL = 0x00000002
+    DRS_EXT_REMOVEAPI = 0x00000004
+    DRS_EXT_MOVEREQ_V2 = 0x00000008
+    DRS_EXT_GETCHG_DEFLATE = 0x00000010
+    DRS_EXT_DCINFO_V1 = 0x00000020
+    DRS_EXT_RESTORE_USN_OPTIMIZATION = 0x00000040
+    DRS_EXT_ADDENTRY = 0x00000080
+    DRS_EXT_KCC_EXECUTE = 0x00000100
+    DRS_EXT_ADDENTRY_V2 = 0x00000200
+    DRS_EXT_LINKED_VALUE_REPLICATION = 0x00000400
+    DRS_EXT_DCINFO_V2 = 0x00000800
+    DRS_EXT_INSTANCE_TYPE_NOT_REQ_ON_MOD = 0x00001000
+    DRS_EXT_CRYPTO_BIND = 0x00002000
+    DRS_EXT_GET_REPL_INFO = 0x00004000
+    DRS_EXT_STRONG_ENCRYPTION = 0x00008000
+    DRS_EXT_DCINFO_VFFFFFFFF = 0x00010000
+    DRS_EXT_TRANSITIVE_MEMBERSHIP = 0x00020000
+    DRS_EXT_ADD_SID_HISTORY = 0x00040000
+    DRS_EXT_POST_BETA3 = 0x00080000
+    DRS_EXT_GETCHGREQ_V5 = 0x00100000
+    DRS_EXT_GETMEMBERSHIPS2 = 0x00200000
+    DRS_EXT_GETCHGREQ_V6 = 0x00400000
+    DRS_EXT_NONDOMAIN_NCS = 0x00800000
+    DRS_EXT_GETCHGREQ_V8 = 0x01000000
+    DRS_EXT_GETCHGREPLY_V5 = 0x02000000
+    DRS_EXT_GETCHGREPLY_V6 = 0x04000000
+    DRS_EXT_GETCHGREPLY_V9 = 0x00000100
+    DRS_EXT_WHISTLER_BETA3 = 0x08000000
+    DRS_EXT_W2K3_DEFLATE = 0x10000000
+    DRS_EXT_GETCHGREQ_V10 = 0x20000000
+    DRS_EXT_RESERVED_FOR_WIN2K_OR_DOTNET_PART2 = 0x40000000
+    DRS_EXT_RESERVED_FOR_WIN2K_OR_DOTNET_PART3 = 0x80000000
+
+
 # dwFlagsExt
 DRS_EXT_ADAM = 0x00000001
 DRS_EXT_LH_BETA2 = 0x00000002
@@ -406,6 +443,12 @@ class PDRS_EXTENSIONS(NDRPOINTER):
     )
 
 
+class PPDRS_EXTENSIONS(NDRPOINTER):
+    referent = (
+        ('Data', PDRS_EXTENSIONS),
+    )
+
+
 # 5.39 DRS_EXTENSIONS_INT
 class DRS_EXTENSIONS_INT(Structure):
     structure = (
@@ -1927,8 +1970,8 @@ class DRSBind(NDRCALL):
 
 class DRSBindResponse(NDRCALL):
     structure = (
-        ('ppextServer', PDRS_EXTENSIONS),
-        ('phDrs', DRS_HANDLE),
+        ('ppextServer', PPDRS_EXTENSIONS),
+        ('phDrs', PDRS_HANDLE),
         ('ErrorCode', DWORD),
     )
 
diff --git a/impacket/dcerpc/v5/rpcrt.py b/impacket/dcerpc/v5/rpcrt.py
index a56bc1b030..f98953dc2c 100644
--- a/impacket/dcerpc/v5/rpcrt.py
+++ b/impacket/dcerpc/v5/rpcrt.py
@@ -26,6 +26,7 @@
 from Cryptodome.Cipher import ARC4
 
 from impacket import ntlm, LOG
+from impacket.dcerpc.v5.enum import Enum
 from impacket.structure import Structure,pack,unpack
 from impacket.krb5 import kerberosv5, gssapi
 from impacket.uuid import uuidtup_to_bin, generate, stringver_to_bin, bin_to_uuidtup
@@ -109,6 +110,15 @@
 RPC_C_AUTHN_NETLOGON      = 0x44
 RPC_C_AUTHN_DEFAULT       = 0xFF
 
+class AUTH_TYPES(Enum):
+    RPC_C_AUTHN_NONE = 0x00
+    RPC_C_AUTHN_GSS_NEGOTIATE = 0x09
+    RPC_C_AUTHN_WINNT = 0x0A
+    RPC_C_AUTHN_GSS_SCHANNEL = 0x0E
+    RPC_C_AUTHN_GSS_KERBEROS = 0x10
+    RPC_C_AUTHN_NETLOGON = 0x44
+    RPC_C_AUTHN_DEFAULT = 0xFF
+
 # Auth Levels
 RPC_C_AUTHN_LEVEL_NONE          = 1
 RPC_C_AUTHN_LEVEL_CONNECT       = 2