diff --git a/repos/os/include/net/arp.h b/repos/os/include/net/arp.h
index 1b9d8e7c0..1feae1352 100644
--- a/repos/os/include/net/arp.h
+++ b/repos/os/include/net/arp.h
@@ -69,79 +69,17 @@ class Net::Arp_packet
 
 	public:
 
-		/********************
-		 ** ARP parameters **
-		 ********************/
-
-		enum Protocol_address_type { IPV4 = 0x0800 };
+		enum Protocol_address_type {
+			IPV4 = 0x0800,
+		};
 
 		enum Hardware_type {
-			ETHERNET                = 0x0001,
-			EXP_ETHERNET            = 0x0002,
-			AX_25                   = 0x0003,
-			TOKEN_RING              = 0x0004,
-			CHAOS                   = 0x0005,
-			IEEE802_NET             = 0x0006,
-			ARCNET                  = 0x0007,
-			HYPERCHANNEL            = 0x0008,
-			LANSTAR                 = 0x0009,
-			AUTONET                 = 0x000A,
-			LOCALTALK               = 0x000B,
-			LOCALNET                = 0x000C,
-			ULTRA_LINK              = 0x000D,
-			SMDS                    = 0x000E,
-			FRAME_RELAY             = 0x000F,
-			ATM_1                   = 0x0010,
-			HDLC                    = 0x0011,
-			FIBRE_CHANNEL           = 0x0012,
-			ATM_2                   = 0x0013,
-			SERIAL_LINE             = 0x0014,
-			ATM_3                   = 0x0015,
-			MIL_STD_188_220         = 0x0016,
-			METRICOM                = 0x0017,
-			IEEE1394                = 0x0018,
-			MAPOS                   = 0x0019,
-			TWINAXIAL               = 0x001A,
-			EUI_64                  = 0x001B,
-			HIPARP                  = 0x001C,
-			IP_AND_ARP_OVER_ISO7816 = 0x001D,
-			ARPSEC                  = 0x001E,
-			IPSEC_TUNNEL            = 0x001F,
-			INFINIBAND              = 0x0020,
-			TIA_102                 = 0x0021,
-			WIEGAND_INTERFACE       = 0x0022,
-			Pure_IP                 = 0x0023,
-			HW_EXP1                 = 0x0024,
-			HFI                     = 0x0025,
-			HW_EXP2                 = 0x0100,
+			ETHERNET = 0x0001,
 		};
 
 		enum Opcode {
-			REQUEST                 = 0x0001,
-			REPLY                   = 0x0002,
-			REQUEST_REVERSE         = 0x0003,
-			REPLY_REVERSE           = 0x0004,
-			DRARP_REQUEST           = 0x0005,
-			DRARP_REPLY             = 0x0006,
-			DRARP_ERROR             = 0x0007,
-			INARP_REQUEST           = 0x0008,
-			INARP_REPLY             = 0x0009,
-			ARP_NAK                 = 0x000A,
-			MARS_REQUEST            = 0x000B,
-			MARS_MULTI              = 0x000C,
-			MARS_MSERV              = 0x000D,
-			MARS_JOIN               = 0x000E,
-			MARS_LEAVE              = 0x000F,
-			MARS_NAK                = 0x0010,
-			MARS_UNSERV             = 0x0011,
-			MARS_SJOIN              = 0x0012,
-			MARS_SLEAVE             = 0x0013,
-			MARS_GROUPLIST_REQUEST  = 0x0014,
-			MARS_GROUPLIST_REPLY    = 0x0015,
-			MARS_REDIRECT_MAP       = 0x0016,
-			MAPOS_UNARP             = 0x0017,
-			OP_EXP1                 = 0x0018,
-			OP_EXP2                 = 0x0019
+			REQUEST = 0x0001,
+			REPLY   = 0x0002,
 		};
 
 
diff --git a/repos/os/include/net/dhcp.h b/repos/os/include/net/dhcp.h
index 6b8446dd3..081f2a9bd 100644
--- a/repos/os/include/net/dhcp.h
+++ b/repos/os/include/net/dhcp.h
@@ -134,18 +134,10 @@ class Net::Dhcp_packet
 					BROADCAST_ADDR = 28,
 					REQ_IP_ADDR    = 50,
 					IP_LEASE_TIME  = 51,
-					OPT_OVERLOAD   = 52,
 					MSG_TYPE       = 53,
 					SERVER         = 54,
-					REQ_PARAMETER  = 55,
-					MESSAGE        = 56,
 					MAX_MSG_SZ     = 57,
-					RENEWAL        = 58,
-					REBINDING      = 59,
-					VENDOR         = 60,
 					CLI_ID         = 61,
-					TFTP_SRV_NAME  = 66,
-					BOOT_FILE      = 67,
 					END            = 255,
 				};
 
diff --git a/repos/os/include/net/ipv4.h b/repos/os/include/net/ipv4.h
index d9ac2fb74..c5fc6b0fd 100644
--- a/repos/os/include/net/ipv4.h
+++ b/repos/os/include/net/ipv4.h
@@ -113,17 +113,6 @@ class Net::Ipv4_packet
 		Genode::uint8_t  _dst[ADDR_LEN];
 		unsigned         _data[0];
 
-		/**
-		 * Bitmasks for differentiated services field.
-		 */
-		enum Differentiated_services {
-			PRECEDENCE  = 0x7,
-			DELAY       = 0x8,
-			THROUGHPUT  = 0x10,
-			RELIABILITY = 0x20,
-			COST        = 0x40
-		};
-
 	public:
 
 		enum class Protocol : Genode::uint8_t
@@ -132,22 +121,6 @@ class Net::Ipv4_packet
 			UDP = 17,
 		};
 
-		enum Precedence {
-			NETWORK_CONTROL      = 7,
-			INTERNETWORK_CONTROL = 6,
-			CRITIC_ECP           = 5,
-			FLASH_OVERRIDE       = 4,
-			FLASH                = 3,
-			IMMEDIATE            = 2,
-			PRIORITY             = 1,
-			ROUTINE              = 0
-		};
-
-		enum Flags {
-			NO_FRAGMENT    = 0x2,
-			MORE_FRAGMENTS = 0x4
-		};
-
 		struct Bad_data_type : Genode::Exception { };
 
 		template <typename T> T const *data(Genode::size_t data_size) const