diff --git a/include/osmocom/core/logging.h b/include/osmocom/core/logging.h
index 79eec10..36ce941 100644
--- a/include/osmocom/core/logging.h
+++ b/include/osmocom/core/logging.h
@@ -125,7 +125,8 @@
 #define DLMGCP		-17	/*!< Osmocom MGCP */
 #define DLJIBUF		-18	/*!< Osmocom Jitter Buffer */
 #define DLRSPRO		-19	/*!< Osmocom Remote SIM Protocol */
-#define OSMO_NUM_DLIB	19	/*!< Number of logging sub-systems in libraries */
+#define DLNS		-20	/*!< Osmocom NS layer */
+#define OSMO_NUM_DLIB	20	/*!< Number of logging sub-systems in libraries */
 
 /* Colors that can be used in log_info_cat.color */
 #define OSMO_LOGCOLOR_NORMAL NULL
diff --git a/include/osmocom/gprs/gprs_ns2.h b/include/osmocom/gprs/gprs_ns2.h
new file mode 100644
index 0000000..68484c1
--- /dev/null
+++ b/include/osmocom/gprs/gprs_ns2.h
@@ -0,0 +1,159 @@
+/*! \file gprs_ns2.h */
+
+
+#pragma once
+
+#include <stdint.h>
+#include <netinet/in.h>
+
+#include <osmocom/core/prim.h>
+
+struct osmo_sockaddr;
+
+struct gprs_ns2_inst;
+struct gprs_ns2_nse;
+struct gprs_ns2_vc;
+struct gprs_ns2_vc_bind;
+struct gprs_ns2_vc_driver;
+struct gprs_ns_ie_ip4_elem;
+struct gprs_ns_ie_ip6_elem;
+
+enum gprs_ns2_vc_mode {
+	NS2_VC_MODE_BLOCKRESET, /* The VC will use RESET/BLOCK/UNBLOCK to start the connection and do ALIVE/ACK */
+	NS2_VC_MODE_ALIVE, /* The will only use ALIVE/ACK */
+};
+
+/*! Osmocom NS primitives according to 48.016 5.2 Service primitves */
+enum gprs_ns2_prim {
+	PRIM_NS_UNIT_DATA,
+	PRIM_NS_CONGESTION,
+	PRIM_NS_STATUS,
+};
+
+/*! Osmocom NS primitives according to 48.016 5.2.2.4 Service primitves */
+enum gprs_ns2_congestion_cause {
+	NS_CONG_CAUSE_BACKWARD_BEGIN,
+	NS_CONG_CAUSE_BACKWARD_END,
+	NS_CONG_CAUSE_FORWARD_BEGIN,
+	NS_CONG_CAUSE_FORWARD_END,
+};
+
+/*! Osmocom NS primitives according to 48.016 5.2.2.6 Service primitves */
+enum gprs_ns2_affecting_cause {
+	NS_AFF_CAUSE_VC_FAILURE,
+	NS_AFF_CAUSE_VC_RECOVERY,
+	NS_AFF_CAUSE_FAILURE,
+	NS_AFF_CAUSE_RECOVERY,
+	/* osmocom own causes */
+	NS_AFF_CAUSE_SNS_CONFIGURED,
+	NS_AFF_CAUSE_SNS_FAILURE,
+};
+
+/*! Osmocom NS primitives according to 48.016 5.2.2.7 Service primitves */
+enum gprs_ns2_change_ip_endpoint {
+	NS_ENDPOINT_NO_CHANGE,
+	NS_ENDPOINT_REQUEST_CHANGE,
+	NS_ENDPOINT_CONFIRM_CHANGE,
+};
+
+struct osmo_gprs_ns2_prim {
+	struct osmo_prim_hdr oph;
+
+	uint16_t nsei;
+	uint16_t bvci;
+
+	union {
+		struct {
+			enum gprs_ns2_change_ip_endpoint change;
+			/* TODO: implement resource distribution
+			 * add place holder for the link selector */
+			long long _resource_distribution_placeholder1;
+			long long _resource_distribution_placeholder2;
+			long long _resource_distribution_placeholder3;
+		} unitdata;
+		struct {
+			enum gprs_ns2_congestion_cause cause;
+		} congestion;
+		struct {
+			enum gprs_ns2_affecting_cause cause;
+			/* 48.016 5.2.2.6 transfer capability */
+			int transfer;
+		} status;
+	} u;
+};
+
+/* instance */
+struct gprs_ns2_inst *gprs_ns2_instantiate(void *ctx, osmo_prim_cb cb, void *cb_data);
+void gprs_ns2_free(struct gprs_ns2_inst *inst);
+int gprs_ns2_dynamic_create_nse(struct gprs_ns2_inst *nsi, bool create_nse);
+
+/* Entrypoint for primitives from the NS USER */
+int gprs_ns2_recv_prim(struct gprs_ns2_inst *nsi, struct osmo_prim_hdr *oph);
+
+struct gprs_ns2_nse *gprs_ns2_nse_by_nsei(struct gprs_ns2_inst *nsi, uint16_t nsei);
+struct gprs_ns2_nse *gprs_ns2_create_nse(struct gprs_ns2_inst *nsi, uint16_t nsei);
+void gprs_ns2_free_nse(struct gprs_ns2_nse *nse);
+
+/* create vc */
+void gprs_ns2_free_nsvc(struct gprs_ns2_vc *nsvc);
+struct gprs_ns2_vc *gprs_ns2_nsvc_by_nsvci(struct gprs_ns2_inst *nsi, uint16_t nsvci);
+
+/* IP VL driver */
+int gprs_ns2_ip_bind(struct gprs_ns2_inst *nsi,
+		     struct osmo_sockaddr *local,
+		     int dscp,
+		     struct gprs_ns2_vc_bind **result);
+void gprs_ns2_bind_set_mode(struct gprs_ns2_vc_bind *bind, enum gprs_ns2_vc_mode mode);
+
+/* create a VC connection */
+struct gprs_ns2_vc *gprs_ns2_ip_connect(struct gprs_ns2_vc_bind *bind,
+					struct osmo_sockaddr *remote,
+					struct gprs_ns2_nse *nse,
+					uint16_t nsvci);
+
+struct gprs_ns2_vc *gprs_ns2_ip_connect2(struct gprs_ns2_vc_bind *bind,
+					 struct osmo_sockaddr *remote,
+					 uint16_t nsei,
+					 uint16_t nsvci);
+struct gprs_ns2_vc *gprs_ns2_ip_connect_inactive(struct gprs_ns2_vc_bind *bind,
+					struct osmo_sockaddr *remote,
+					struct gprs_ns2_nse *nse,
+					uint16_t nsvci);
+
+void gprs_ns2_free_bind(struct gprs_ns2_vc_bind *bind);
+
+/* create a VC SNS connection */
+int gprs_ns2_ip_connect_sns(struct gprs_ns2_vc_bind *bind,
+			    struct osmo_sockaddr *remote,
+			    uint16_t nsei);
+
+struct osmo_sockaddr *gprs_ns2_ip_vc_sockaddr(struct gprs_ns2_vc *nsvc);
+struct osmo_sockaddr *gprs_ns2_ip_bind_sockaddr(struct gprs_ns2_vc_bind *bind);
+int gprs_ns2_is_ip_bind(struct gprs_ns2_vc_bind *bind);
+int gprs_ns2_ip_bind_set_dscp(struct gprs_ns2_vc_bind *bind, int dscp);
+int gprs_ns2_find_vc_by_sockaddr(
+		struct gprs_ns2_vc_bind *bind,
+		struct osmo_sockaddr *saddr,
+		struct gprs_ns2_vc **result);
+
+int gprs_ns2_frgre_bind(struct gprs_ns2_inst *nsi,
+			struct osmo_sockaddr *local,
+			int dscp,
+			struct gprs_ns2_vc_bind **result);
+int gprs_ns2_is_frgre_bind(struct gprs_ns2_vc_bind *bind);
+
+struct gprs_ns2_vc *gprs_ns2_nsvc_by_sockaddr(struct gprs_ns2_nse *nsei,
+					      struct osmo_sockaddr *sockaddr);
+void gprs_ns2_start_alive_all_nsvcs(struct gprs_ns2_nse *nse);
+const char *gprs_ns2_cause_str(int cause);
+const char *gprs_ns2_ll_str(struct gprs_ns2_vc *nsvc);
+char *gprs_ns2_ll_str_buf(char *buf, size_t buf_len, struct gprs_ns2_vc *nsvc);
+char *gprs_ns2_ll_str_c(const void *ctx, struct gprs_ns2_vc *nsvc);
+
+/* vty */
+int gprs_ns2_vty_init(struct gprs_ns2_inst *nsi);
+int gprs_ns2_vty_create();
+void gprs_ns2_vty_force_vc_mode(bool force, enum gprs_ns2_vc_mode mode, char *reason);
+
+
+/*! @} */
diff --git a/include/osmocom/gprs/protocol/gsm_08_16.h b/include/osmocom/gprs/protocol/gsm_08_16.h
index 95efcb6..e035ebf 100644
--- a/include/osmocom/gprs/protocol/gsm_08_16.h
+++ b/include/osmocom/gprs/protocol/gsm_08_16.h
@@ -6,6 +6,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <arpa/inet.h>
 
 /*! \addtogroup libgb
  *  @{
@@ -26,6 +27,14 @@
 	uint8_t data_weight;
 } __attribute__ ((packed));
 
+/*! Section 10.3.2d List of IP6 Elements */
+struct gprs_ns_ie_ip6_elem {
+	struct in6_addr ip_addr;
+	uint16_t udp_port;
+	uint8_t sig_weight;
+	uint8_t data_weight;
+} __attribute__ ((packed));
+
 extern const struct value_string gprs_ns_pdu_strings[];
 
 /*! NS PDU Type (TS 08.16, Section 10.3.7, Table 14) */
diff --git a/include/osmocom/gsm/prim.h b/include/osmocom/gsm/prim.h
index 386b7d8..e7a60e3 100644
--- a/include/osmocom/gsm/prim.h
+++ b/include/osmocom/gsm/prim.h
@@ -14,4 +14,6 @@
 	SAP_BSSGP_LL,
 	SAP_BSSGP_NM,
 	SAP_BSSGP_PFM,
+
+	SAP_NS,
 };