diff --git a/CMakeLists.txt b/CMakeLists.txt
index a3507ef..2fc124d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -68,6 +68,7 @@ set(SERVER_SRCS
 	src/server/rccpp.cpp
 	src/impl/fs.cpp
 	src/impl/event.cpp
+	src/impl/tcpsocket.cpp
 )
 add_executable(${SERVER_EXE_NAME} ${SERVER_SRCS})
 TARGET_LINK_LIBRARIES(${SERVER_EXE_NAME}
diff --git a/design.txt b/design.txt
index 4e8cb37..dec0b16 100644
--- a/design.txt
+++ b/design.txt
@@ -49,3 +49,6 @@ name->type registry is used for determining numeric packet types.
 
 Data is freeform. Types 0...100 are reserved for initialization.
 
+Core uses cereal's portable binary serialization.
+
+
diff --git a/share/builtin/network/server/init.cpp b/share/builtin/network/server/init.cpp
new file mode 100644
index 0000000..2369a89
--- /dev/null
+++ b/share/builtin/network/server/init.cpp
@@ -0,0 +1,48 @@
+#include "interface/module.h"
+#include "interface/server.h"
+#include "interface/event.h"
+#include "interface/tcpsocket.h"
+//#include "network/include/api.h"
+#include <iostream>
+
+using interface::Event;
+
+namespace network {
+
+struct Module: public interface::Module
+{
+	interface::Server *m_server;
+	sp_<interface::TCPSocket> m_socket;
+
+	Module(interface::Server *server):
+		m_server(server),
+		m_socket(interface::createTCPSocket())
+	{
+		std::cout<<"network construct"<<std::endl;
+
+		ss_ address = "any";
+		ss_ port = "20000";
+
+		if(!m_socket->bind_fd(address, port)){
+			std::cerr<<"Failed to bind to "<<address<<":"<<port<<std::endl;
+		} else {
+			std::cerr<<"Listening at "<<address<<":"<<port<<std::endl;
+		}
+	}
+
+	~Module()
+	{
+		std::cout<<"network destruct"<<std::endl;
+	}
+
+	void event(const interface::Event &event)
+	{
+	}
+};
+
+extern "C" {
+	EXPORT void* createModule_network(interface::Server *server){
+		return (void*)(new Module(server));
+	}
+}
+}
diff --git a/src/impl/tcpsocket.cpp b/src/impl/tcpsocket.cpp
new file mode 100644
index 0000000..a00c756
--- /dev/null
+++ b/src/impl/tcpsocket.cpp
@@ -0,0 +1,295 @@
+#include "interface/tcpsocket.h"
+#include <iostream>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h> // strerror()
+#include <netinet/in.h>
+#include <iomanip>
+#include <netdb.h>
+
+namespace interface {
+
+const unsigned char prefix[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xFF, 0xFF};
+
+bool sockaddr_to_bytes(const sockaddr_storage* ptr, sv_<uchar>& to)
+{
+	if(ptr->ss_family == AF_INET)
+	{
+		uchar* u = (uchar*)&((struct sockaddr_in*)ptr)->sin_addr.s_addr;
+		to.assign(u, u + 4);
+		return true;
+	}
+	else if(ptr->ss_family == AF_INET6)
+	{
+		uchar* u = (uchar*)&((struct sockaddr_in6*)ptr)->sin6_addr.s6_addr;
+		if(memcmp(prefix, u, sizeof(prefix)) == 0){
+			to.assign(u + 12, u + 16);
+			return true;
+		}
+		to.assign(u, u + 16);
+		return true;
+	}
+
+	return false;
+};
+
+std::string address_bytes_to_string(const sv_<uchar> &ip)
+{
+	std::ostringstream os;
+	for(size_t i=0; i<ip.size(); i++){
+		if(ip.size() == 4){
+			os<<std::dec<<std::setfill('0')<<std::setw(0)
+					<<((uint32_t)ip[i]&0xff);
+			if(i < ip.size()-1)
+				os<<".";
+		} else {
+			os<<std::hex<<std::setfill('0')<<std::setw(2)
+					<<((uint32_t)ip[i]&0xff);
+			i++;
+			if(i < ip.size())
+				os<<std::hex<<std::setfill('0')<<std::setw(2)
+						<<((uint32_t)ip[i]&0xff);
+			if(i < ip.size()-1)
+				os<<":";
+		}
+	}
+	return os.str();
+}
+
+
+struct CTCPSocket: public TCPSocket
+{
+	int m_fd = 0;
+
+	int fd() const
+	{
+		return m_fd;
+	}
+	bool good() const
+	{
+		return (m_fd != -1);
+	}
+	void close_fd()
+	{
+		if(m_fd != -1)
+			close(m_fd);
+		m_fd = -1;
+	}
+	bool listen_fd()
+	{
+		if(m_fd == -1)
+			return false;
+		if(listen(m_fd, 5) == -1){
+			std::cerr<<"TCPSocket::listen_fd(): "<<strerror(errno)<<std::endl;
+			return false;
+		}
+		return true;
+	}
+	bool connect_fd(const ss_ &address, const ss_ &port)
+	{
+		close_fd();
+
+		struct addrinfo hints;
+		struct addrinfo *res0 = NULL;
+		memset(&hints, 0, sizeof(hints));
+		hints.ai_family = AF_UNSPEC;
+		hints.ai_socktype = SOCK_STREAM;
+		hints.ai_protocol = IPPROTO_TCP;
+		if(address == "any")
+			hints.ai_flags = AI_PASSIVE; // Wildcard address
+		const char *address_c = (address == "any" ? NULL : address.c_str());
+		const char *port_c = (port == "any" ? NULL : port.c_str());
+		int err = getaddrinfo(address_c, port_c, &hints, &res0);
+		if(err){
+			std::cerr<<"getaddrinfo: "<<gai_strerror(err)<<std::endl;
+			return false;
+		}
+		if(res0 == NULL){
+			std::cerr<<"getaddrinfo: No results"<<std::endl;
+			return false;
+		}
+
+		// Try to use one of the results
+		int fd = -1;
+		int i=0;
+		for(struct addrinfo *res = res0; res != NULL; res = res->ai_next, i++)
+		{
+			std::cerr<<"Trying addrinfo #"<<i<<std::endl;
+			int try_fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+			if(try_fd == -1){
+				std::cerr<<"socket: "<<strerror(errno)<<std::endl;
+				continue;
+			}
+			if(connect(try_fd, res->ai_addr, res->ai_addrlen) == -1){
+				std::cerr<<"connect: "<<strerror(errno)<<std::endl;
+				close(try_fd);
+				continue;
+			}
+			fd = try_fd;
+			break;
+		}
+		freeaddrinfo(res0);
+
+		if(fd == -1){
+			std::cerr<<"Failed to create and connect socket"<<std::endl;
+			return false;
+		}
+
+		int val = 1;
+		setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
+
+		// Set this so that forked child processes don't prevent re-opening the
+		// same port after crash
+		if(fcntl(fd, F_SETFD, FD_CLOEXEC) != 0){
+			std::cerr<<"Failed to set socket FD_CLOEXEC"<<std::endl;
+			return false;
+		}
+
+		m_fd = fd;
+		return true;
+	}
+	bool bind_fd(const ss_ &address, const ss_ &port)
+	{
+		close_fd();
+
+		struct addrinfo hints;
+		struct addrinfo *res0 = NULL;
+		memset(&hints, 0, sizeof(hints));
+		hints.ai_family = AF_UNSPEC;
+		hints.ai_socktype = SOCK_STREAM;
+		hints.ai_protocol = IPPROTO_TCP;
+		std::string address1 = address;
+		if(address1 == "any4"){
+			address1 = "any";
+			hints.ai_family = AF_INET;
+		}
+		if(address1 == "any6"){
+			address1 = "any";
+			hints.ai_family = AF_INET6;
+		}
+		if(address1 == "any"){
+			hints.ai_flags = AI_PASSIVE; // Wildcard address
+		}
+		const char *address_c = (address1 == "any" ? NULL : address1.c_str());
+		const char *port_c = (port == "any" ? NULL : port.c_str());
+		int err = getaddrinfo(address_c, port_c, &hints, &res0);
+		if(err){
+			std::cerr<<"getaddrinfo: "<<gai_strerror(err)<<std::endl;
+			return false;
+		}
+		if(res0 == NULL){
+			std::cerr<<"getaddrinfo: No results"<<std::endl;
+			return false;
+		}
+
+		// Try to use one of the results
+		int fd = -1;
+		int i=0;
+		for(struct addrinfo *res = res0; res != NULL; res = res->ai_next, i++)
+		{
+			//std::cerr<<"Trying addrinfo #"<<i<<std::endl;
+			int try_fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+			if(try_fd == -1){
+				//std::cerr<<"socket: "<<strerror(errno)<<std::endl;
+				continue;
+			}
+			int val = 1;
+			setsockopt(try_fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
+			if(res->ai_family == AF_INET6){
+				int val = 1;
+				setsockopt(try_fd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
+			}
+			if(bind(try_fd, res->ai_addr, res->ai_addrlen) == -1){
+				//std::cerr<<"bind: "<<strerror(errno)<<std::endl;
+				close(try_fd);
+				continue;
+			}
+			fd = try_fd;
+			break;
+		}
+		freeaddrinfo(res0);
+
+		if(fd == -1){
+			std::cerr<<"Failed to create and bind socket"<<std::endl;
+			return false;
+		}
+
+		// Set this so that forked child processes don't prevent re-opening the
+		// same port after crash
+		if(fcntl(fd, F_SETFD, FD_CLOEXEC) != 0){
+			std::cerr<<"Failed to set socket FD_CLOEXEC"<<std::endl;
+			return false;
+		}
+
+		m_fd = fd;
+		return true;
+	}	
+	bool accept_fd(const TCPSocket &listener)
+	{
+		close_fd();
+
+		if(!listener.good())
+			return false;
+
+		struct sockaddr_storage pin;
+		socklen_t pin_len = sizeof(pin);
+		int fd_client = accept(listener.fd(), (struct sockaddr *)  &pin, &pin_len);
+		if(fd_client == -1){
+			std::cerr<<"accept: "<<strerror(errno)<<std::endl;
+			return false;
+		}
+
+		int val = 1;
+		setsockopt(fd_client, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
+
+		m_fd = fd_client;
+		return true;
+	}
+	bool send_fd(const ss_ &data)
+	{
+		if(m_fd == -1)
+			return false;
+		if(send(m_fd, &data[0], data.size(), 0) == -1){
+			std::cerr<<"send: "<<strerror(errno)<<std::endl;
+			return false;
+		}
+		return true;
+	}
+	ss_ get_local_address() const
+	{
+		if(m_fd == -1)
+			return "";
+		struct sockaddr_storage sa;
+		socklen_t sa_len = sizeof(sa);
+		if(getpeername(m_fd, (sockaddr*)&sa, &sa_len) == -1)
+			return "";
+		sv_<uchar> a;
+		if(!sockaddr_to_bytes(&sa, a))
+			return "";
+		return address_bytes_to_string(a);
+	}
+	ss_ get_remote_address() const
+	{
+		if(m_fd == -1)
+			return "";
+		struct sockaddr_storage sa;
+		socklen_t sa_len = sizeof(sa);
+		if(getsockname(m_fd, (sockaddr*)&sa, &sa_len) == -1)
+			return "";
+		sv_<uchar> a;
+		if(!sockaddr_to_bytes(&sa, a))
+			return "";
+		return address_bytes_to_string(a);
+	}
+};
+
+TCPSocket* createTCPSocket()
+{
+	return new CTCPSocket();
+}
+
+}
diff --git a/src/interface/server.h b/src/interface/server.h
index 8b5b5fa..fd26337 100644
--- a/src/interface/server.h
+++ b/src/interface/server.h
@@ -10,6 +10,7 @@ namespace interface
 		virtual ~Server(){}
 		virtual void load_module(const ss_ &module_name, const ss_ &path) = 0;
 		virtual ss_ get_modules_path() = 0;
+		virtual ss_ get_builtin_modules_path() = 0;
 		virtual Module* get_module(const ss_ &module_name) = 0;
 	};
 }
diff --git a/src/interface/tcpsocket.h b/src/interface/tcpsocket.h
new file mode 100644
index 0000000..1f81468
--- /dev/null
+++ b/src/interface/tcpsocket.h
@@ -0,0 +1,24 @@
+#pragma once
+#include "core/types.h"
+
+namespace interface
+{
+	struct TCPSocket
+	{
+		virtual ~TCPSocket(){}
+		virtual int fd() const = 0;
+		virtual bool good() const = 0;
+		virtual void close_fd() = 0;
+		virtual bool listen_fd() = 0;
+		virtual bool connect_fd(const ss_ &address, const ss_ &port) = 0;
+		// Special values "any4", "any6" and "any"
+		virtual bool bind_fd(const ss_ &address, const ss_ &port) = 0;
+		virtual bool accept_fd(const TCPSocket &listener) = 0;
+		virtual bool send_fd(const ss_ &data) = 0;
+		virtual ss_ get_local_address() const = 0;
+		virtual ss_ get_remote_address() const = 0;
+	};
+
+	TCPSocket* createTCPSocket();
+}
+
diff --git a/src/server/config.h b/src/server/config.h
index e39e62c..8676cd1 100644
--- a/src/server/config.h
+++ b/src/server/config.h
@@ -7,6 +7,7 @@ namespace server
 	{
 		ss_ rccpp_build_path = "../cache/rccpp_build";
 		ss_ interface_path = "../src/interface";
+		ss_ share_path = "../share";
 	};
 }
 
diff --git a/src/server/main.cpp b/src/server/main.cpp
index 044750a..f982449 100644
--- a/src/server/main.cpp
+++ b/src/server/main.cpp
@@ -12,13 +12,14 @@ int main(int argc, char *argv[])
 
 	std::string module_path;
 
-	const char opts[100] = "hm:r:i:";
+	const char opts[100] = "hm:r:i:S:";
 	const char usagefmt[1000] =
 	"Usage: %s [OPTION]...\n"
 	"  -h                   Show this help\n"
 	"  -m [module_path]     Specify module path\n"
 	"  -r [rccpp_build_path]Specify runtime compiled C++ build path\n"
 	"  -i [interface_path]  Specify path to interface headers\n"
+	"  -S [share_path]      Specify path to share/\n"
 	;
 
 	int c;
@@ -41,6 +42,10 @@ int main(int argc, char *argv[])
 			fprintf(stderr, "INFO: config.interface_path: %s\n", c55_optarg);
 			config.interface_path = c55_optarg;
 			break;
+		case 'S':
+			fprintf(stderr, "INFO: config.share_path: %s\n", c55_optarg);
+			config.share_path = c55_optarg;
+			break;
 		default:
 			fprintf(stderr, "ERROR: Invalid command-line argument\n");
 			fprintf(stderr, usagefmt, argv[0]);
diff --git a/src/server/state.cpp b/src/server/state.cpp
index a64e378..67f92ca 100644
--- a/src/server/state.cpp
+++ b/src/server/state.cpp
@@ -57,6 +57,11 @@ struct CState: public State, public interface::Server
 		return m_modules_path;
 	}
 
+	ss_ get_builtin_modules_path()
+	{
+		return g_server_config.share_path+"/builtin";
+	}
+
 	interface::Module* get_module(const ss_ &module_name)
 	{
 		auto it = m_modules.find(module_name);
diff --git a/test/testmodules/__loader/server/init.cpp b/test/testmodules/__loader/server/init.cpp
index 19c7315..945a058 100644
--- a/test/testmodules/__loader/server/init.cpp
+++ b/test/testmodules/__loader/server/init.cpp
@@ -2,7 +2,6 @@
 #include "interface/server.h"
 #include "interface/fs.h"
 #include "interface/event.h"
-//#include <cereal/archives/binary.hpp>
 #include <iostream>
 
 using interface::Event;
@@ -35,10 +34,13 @@ struct Module: public interface::Module
 
 	void load_modules()
 	{
+		m_server->load_module("network", m_server->get_builtin_modules_path()+"/network");
+
 		sv_<ss_> load_list = {"test1", "test2"};
 		for(const ss_ &name : load_list){
 			m_server->load_module(name, m_server->get_modules_path()+"/"+name);
 		}
+
 		/*// TODO: Dependencies
 		auto list = interface::getGlobalFilesystem()->list_directory(m_server->get_modules_path());
 		for(const interface::Filesystem::Node &n : list){