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diff --git a/misc/network_servers/vtl/if.h b/misc/network_servers/vtl/if.h
new file mode 100644
index 0000000..03be171
--- /dev/null
+++ b/misc/network_servers/vtl/if.h
@@ -0,0 +1,67 @@
+#ifndef __IF_H
+#define __IF_H 1
+
+#include "util.h"
+#include "debug.h"
+#include "raw_ethernet_packet.h"
+
+
+
+#ifdef linux
+#include <libnet.h>
+#define LIBNET_ERRORBUF_SIZE 256
+#elif defined(WIN32)
+#define WPCAP
+#endif
+
+#include <pcap.h>
+
+#ifdef WIN32
+#include <Packet32.h>
+#endif
+
+
+typedef struct iface {
+  string *name;
+
+  pcap_t * pcap_interface;
+
+  char mode;
+
+#ifdef linux
+  int pcap_fd;
+
+  libnet_t * net_interface;
+#elif defined(WIN32)
+  HANDLE pcap_event;
+#endif
+
+} iface_t;
+
+#define IF_PACKET 1
+#define IF_BREAK 2
+#define IF_CONT 3
+
+
+#define IF_RD 0x1
+#define IF_WR 0x2
+#define IF_RW 0x3
+
+
+iface_t * if_connect(string if_name, char mode = IF_RW);
+int if_setup_filter(iface_t * iface, string bpf_str);
+
+#ifdef linux
+int if_get_fd(iface_t * iface);
+#elif WIN32
+HANDLE if_get_event(iface_t * iface);
+#endif
+
+int if_loop(iface_t * iface, RawEthernetPacket * pkt);
+void pkt_handler(u_char * pkt, const struct pcap_pkthdr * pkt_header, const u_char * pkt_data);
+
+int if_write_pkt(iface_t * iface, RawEthernetPacket * pkt);
+int if_read_pkt(iface_t * iface, RawEthernetPacket * pkt);
+
+
+#endif // !__IF_H