diff --git a/OpenVPN Adapter/OpenVPNPacket.h b/OpenVPN Adapter/OpenVPNPacket.h
index 9e423dd..5b0bacc 100644
--- a/OpenVPN Adapter/OpenVPNPacket.h	
+++ b/OpenVPN Adapter/OpenVPNPacket.h	
@@ -11,11 +11,24 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OpenVPNPacket : NSObject
 
-@property (readonly, nonatomic) NSData *data;
+/**
+ Data that can be written to the VPN socket.
+ */
+@property (readonly, nonatomic) NSData *vpnData;
+
+/**
+ Data that can be written to the packet flow.
+ */
+@property (readonly, nonatomic) NSData *packetFlowData;
+
+/**
+ Protocol number (e.g. PF_INET or PF_INET6) of the packet.
+ */
 @property (readonly, nonatomic) NSNumber *protocolFamily;
 
 - (instancetype)init NS_UNAVAILABLE;
-- (instancetype)initWithData:(NSData *)data protocolFamily:(NSNumber *)protocolFamily NS_DESIGNATED_INITIALIZER;
+- (instancetype)initWithVPNData:(NSData *)data NS_DESIGNATED_INITIALIZER;
+- (instancetype)initWithPacketFlowData:(NSData *)data protocolFamily:(NSNumber *)protocolFamily NS_DESIGNATED_INITIALIZER;
 
 @end
 
diff --git a/OpenVPN Adapter/OpenVPNPacket.m b/OpenVPN Adapter/OpenVPNPacket.m
deleted file mode 100644
index 99aee01..0000000
--- a/OpenVPN Adapter/OpenVPNPacket.m	
+++ /dev/null
@@ -1,20 +0,0 @@
-//
-//  OpenVPNPacket.m
-//  OpenVPN Adapter
-//
-//  Created by Sergey Abramchuk on 15.01.2018.
-//
-
-#import "OpenVPNPacket.h"
-
-@implementation OpenVPNPacket
-
-- (instancetype)initWithData:(NSData *)data protocolFamily:(NSNumber *)protocolFamily {
-    if ((self = [super init])) {
-        _data = data;
-        _protocolFamily = protocolFamily;
-    }
-    return self;
-}
-
-@end
diff --git a/OpenVPN Adapter/OpenVPNPacket.mm b/OpenVPN Adapter/OpenVPNPacket.mm
new file mode 100644
index 0000000..f9344fb
--- /dev/null
+++ b/OpenVPN Adapter/OpenVPNPacket.mm	
@@ -0,0 +1,95 @@
+//
+//  OpenVPNPacket.m
+//  OpenVPN Adapter
+//
+//  Created by Sergey Abramchuk on 15.01.2018.
+//
+
+#import "OpenVPNPacket.h"
+
+#include <arpa/inet.h>
+
+#include <openvpn/ip/ip.hpp>
+
+@interface OpenVPNPacket () {
+    NSData *_data;
+    NSNumber *_protocolFamily;
+}
+
+@end
+
+@implementation OpenVPNPacket
+
+- (instancetype)initWithVPNData:(NSData *)data {
+    if ((self = [super init])) {
+#if TARGET_OS_IPHONE
+        // Get network protocol family from data prefix
+        NSUInteger prefix_size = sizeof(uint32_t);
+        
+        uint32_t protocol = PF_UNSPEC;
+        [data getBytes:&protocol length:prefix_size];
+        protocol = CFSwapInt32BigToHost(protocol);
+        
+        NSRange range = NSMakeRange(prefix_size, data.length - prefix_size);
+        NSData *packetData = [data subdataWithRange:range];
+#else
+        // Get network protocol family from packet header
+        uint8_t header = 0;
+        [data getBytes:&header length:1];
+        
+        uint32_t protocol = PF_UNSPEC;
+        
+        uint32_t version = openvpn::IPHeader::version(header);
+        switch (version) {
+            case 4:
+                protocol = PF_INET;
+                break;
+            case 6:
+                protocol = PF_INET6;
+                break;
+        }
+
+        NSData *packetData = data;
+#endif
+        
+        _data = packetData;
+        _protocolFamily = @(protocol);
+    }
+    return self;
+}
+
+- (instancetype)initWithPacketFlowData:(NSData *)data protocolFamily:(NSNumber *)protocolFamily {
+    if ((self = [super init])) {
+        _data = data;
+        _protocolFamily = protocolFamily;
+    }
+    return self;
+}
+
+- (NSData *)vpnData {
+#if TARGET_OS_IPHONE
+    // Prepend data with network protocol. It should be done because OpenVPN on iOS uses uint32_t prefixes containing network
+    // protocol.
+    uint32_t prefix = CFSwapInt32HostToBig(_protocolFamily.unsignedIntegerValue);
+    NSUInteger prefix_size = sizeof(uint32_t);
+    
+    NSMutableData *data = [NSMutableData dataWithCapacity:prefix_size + _data.length];
+    
+    [data appendBytes:&prefix length:prefix_size];
+    [data appendData:_data];
+    
+    return data;
+#else
+    return _data;
+#endif
+}
+
+- (NSData *)packetFlowData {
+    return _data;
+}
+
+- (NSNumber *)protocolFamily {
+    return _protocolFamily;
+}
+
+@end