diff --git a/src/Network/network.c b/src/Network/network.c
new file mode 100644
index 0000000..6a29d30
--- /dev/null
+++ b/src/Network/network.c
@@ -0,0 +1,41 @@
+#include "network.h"
+
+Maybe knIPV4Address_fromStr(char* addrStr){
+    char* addrStr_src=addrStr;
+    char* errmsg_extra="wrong char";
+    uint8 c;
+    knIPV4Address addr;
+    addr.address=0;
+    uint16 n=0;
+    for(uint8 i=0; i<4; ){
+        c=*addrStr++;
+        switch (c){
+            case '\0':
+                if(i<3) {
+                    errmsg_extra="end of string";
+                    goto default_case;
+                }
+            case '.':
+                addr.bytes[i++]=n;
+                n=0;
+                break;
+            case '0': case '1': case '2': case '3': case '4':
+            case '5': case '6': case '7': case '8': case '9':
+                n=n*10+c-'0';
+                if(n>255) {
+                    errmsg_extra="one part of address > 255";
+                    goto default_case;
+                }
+                break;
+            default_case:
+            default:
+                uint32 errmsgL=cptr_length(addrStr) + 80;
+                char* errmsg=malloc(errmsgL);
+                IFWIN(sprintf_s(errmsg, errmsgL, "wrong ip address string: %s\n   %s", addrStr_src, errmsg_extra), 
+                      sprintf(  errmsg,          "wrong ip address string: %s\n   %s", addrStr_src, errmsg_extra));
+                safethrow(errmsg,;);
+                break;
+        }
+    }
+    return SUCCESS(Uni(UInt64, (uint64)addr.address));
+}
\ No newline at end of file
diff --git a/src/Network/network.h b/src/Network/network.h
index f877cac..d55b38d 100644
--- a/src/Network/network.h
+++ b/src/Network/network.h
@@ -6,7 +6,12 @@ extern "C" {
 
 #include "../Hashtable/Hashtable.h"
 
-#if defined(_MSC_VER) || defined(_WIN64) || defined(_WIN32)
+
+#if defined(_MSC_VER) || defined(_WIN64) || defined(_WIN32) || 1
+    #define KN_USE_WINSOCK 1
+#endif
+
+#if KN_USE_WINSOCK
     #include "winsock.h"
 #else
     #include "../Hashtable/Hashtable.h"
@@ -16,28 +21,96 @@ extern "C" {
     #include <netdb.h> 
 #endif
 
-#define KNPAC_MAX_DATA_SIZE 65503
+#define KNPAC_MAX_DATA_SIZE (65535-sizeof(knPackage)+sizeof(uint8*))
 
-typedef struct knPackage{
+
+typedef enum __attribute__((__packed__)) knPacVersion {
+    knPac_V1
+} knPacVersion;
+
+typedef struct knPackage {
     char header[5];             // knpac
-    uint8 version;              // protocol version
-    uint16 data_size;           // size of data block in bytes (1-)
+    knPacVersion version;       // protocol version
+    uint16 data_size;           // size of data block in bytes (1-KNPAC_MAX_DATA_SIZE)
     uint32 package_num;         // number in sequence of sent packages
     uint32 destination_hash;    // hash32 of knDestination.name
     uint64 data_hash;           // hash64 of data
     uint8* data;                // ptr to data
 } knPackage;
 
-typedef struct knDestination{
-    char* name;
+typedef struct knPackageQueueElem knPackageQueueElem;
+struct knPackageQueueElem {
+    union{
+        knPackage;
+        knPackage package;
+    };
+    knPackageQueueElem* previousElem;
+    knPackageQueueElem* nextElem;
+};
+
+typedef struct knDestination {
+    knPackageQueueElem* queueStart;
 
 } knDestination;
 
+typedef union knIPV4Address {
+    uint32 address;
+    char bytes[4];
+} knIPV4Address;
+
+#define knIPV4Address_fromBytes(A, B, C, D) (knIPV4Address){.bytes={A,B,C,D}}
+
+///@return Maybe<uint64> as Maybe<knIPV4Address>
+Maybe knIPV4Address_fromStr(char* addrStr);
+
+typedef uint16 knPort;
+
+typedef struct __attribute__((__packed__)) knIPV4Endpoint {
+    knIPV4Address address;
+    knPort port;
+} knIPV4Endpoint;
+
+#define knIPV4Endpoint_create(ADDR, PORT) (knIPV4Endpoint){ADDR, PORT}
+
+typedef enum __attribute__((__packed__)) knSockType {
+    knSockType_TCP, knSockType_UDP 
+} knSockType;
+
 typedef struct knSocket {
-    Hashtable* destinations;
+    knDestination* destinations;
     int socketfd;
+    knSockType type;
+    knIPV4Endpoint localEndpoint;
+    knIPV4Endpoint remoteEndpoint;
 } knSocket;
 
+///@returns Maybe<knSocket*> new socket
+Maybe knSocket_open(knSockType sockType);
+
+///@return Maybe<void> error or nothing
+Maybe knSocket_close(knSocket* socket);
+
+///sets socket local endpoint
+///@return Maybe<void> error or nothing
+Maybe knSocket_bind(knSocket* socket, knIPV4Endpoint localEndp);
+
+///sets socket remote endpoint
+///@return Maybe<void> error or nothing
+Maybe knSocket_connect(knSocket* socket, knIPV4Endpoint remoteEndp);
+
+///@return Maybe<knSocket*> new socket connected to client
+Maybe knSocket_accept(knSocket* socket);
+
+///@param dataLength 0-4294967295
+///@return Maybe<void>
+Maybe knSocket_send(knSocket* socket, uint8* data, uint32 dataLength);
+
+///@param buffer buffer for recieving data
+///@param bufferLength 0-4294967295
+///@return Maybe<uint64> recieved bytes amount
+Maybe knSocket_recieve(knSocket* socket, uint8* buffer, uint32 bufferLength);         
+
+
 #if __cplusplus
 }
 #endif
\ No newline at end of file