diff --git a/.gitignore b/.gitignore
index da8b9cb1..af06926f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,6 @@
 # Build directory (out-of-tree build)
 /build/
 build-win/
-cross-build-win.sh
 tools/chatgui/build/
 
 # Build outputs
diff --git a/cross-build-win.sh b/cross-build-win.sh
new file mode 100755
index 00000000..f9c5ffdc
--- /dev/null
+++ b/cross-build-win.sh
@@ -0,0 +1,284 @@
+#!/bin/bash
+# cross-build-win.sh — кросс-компиляция uTun для Windows 10 из Linux
+# Использование: ./cross-build-win.sh [--clean]
+set -euo pipefail
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+CYAN='\033[0;36m'
+NC='\033[0m'
+
+step()  { echo -e "${CYAN}===${NC} $*"; }
+ok()    { echo -e "${GREEN}[OK]${NC} $*"; }
+warn()  { echo -e "${YELLOW}[WARNING]${NC} $*"; }
+fatal() { echo -e "${RED}FATAL:${NC} $*" >&2; exit 1; }
+
+trap 'fatal "script failed at line $LINENO (exit code: $?)"' ERR
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+BUILD_DIR="$SCRIPT_DIR/build-win"
+PREFIX="$BUILD_DIR/prefix"
+
+MINGW_CC="x86_64-w64-mingw32-gcc"
+MINGW_AR="x86_64-w64-mingw32-ar"
+MINGW_RANLIB="x86_64-w64-mingw32-ranlib"
+
+MINGW_PKGS="gcc-mingw-w64-x86-64-posix g++-mingw-w64-x86-64-posix"
+OPENSSL_VER="3.0.16"
+OPENSSL_URL="https://github.com/openssl/openssl/releases/download/openssl-${OPENSSL_VER}/openssl-${OPENSSL_VER}.tar.gz"
+
+# -------------------------------------------------------------------
+# 0. Аргументы
+# -------------------------------------------------------------------
+CLEAN=0
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        --clean) CLEAN=1; shift ;;
+        *) fatal "unknown option: $1" ;;
+    esac
+done
+
+if [ "$CLEAN" -eq 1 ]; then
+    echo -e "${YELLOW}Cleaning build directory: $BUILD_DIR${NC}"
+    rm -rf "$BUILD_DIR"
+fi
+
+echo -e "${CYAN}==============================================${NC}"
+echo -e "${CYAN}  uTun Cross-Compilation for Windows 10${NC}"
+echo -e "${CYAN}==============================================${NC}"
+echo ""
+
+# -------------------------------------------------------------------
+# 1. Проверка системы
+# -------------------------------------------------------------------
+step "Checking system..."
+if [ "$(uname -s)" != "Linux" ]; then
+    fatal "This script only runs on Linux. Detected: $(uname -s)"
+fi
+if [ "$(uname -m)" != "x86_64" ]; then
+    fatal "This script requires x86_64 architecture. Detected: $(uname -m)"
+fi
+
+if ! command -v apt-get &>/dev/null; then
+    fatal "apt-get not found. Only Debian/Ubuntu are supported."
+fi
+ok "System: Linux x86_64 with apt"
+
+# -------------------------------------------------------------------
+# 2. Установка пакетов
+# -------------------------------------------------------------------
+step "Installing required packages..."
+
+need_install=()
+for pkg in $MINGW_PKGS; do
+    if ! dpkg -s "$pkg" &>/dev/null 2>&1; then
+        need_install+=("$pkg")
+    fi
+done
+if ! command -v wget &>/dev/null && ! command -v curl &>/dev/null; then
+    need_install+=("wget")
+fi
+
+if [ ${#need_install[@]} -gt 0 ]; then
+    echo "  Installing: ${need_install[*]}"
+    sudo apt-get update -qq || fatal "apt-get update failed"
+    sudo apt-get install -y -qq "${need_install[@]}" || fatal "apt-get install failed"
+    ok "Packages installed: ${need_install[*]}"
+else
+    ok "All packages already installed"
+fi
+
+# Проверка компилятора
+for tool in "$MINGW_CC" "$MINGW_AR" "$MINGW_RANLIB"; do
+    if ! command -v "$tool" &>/dev/null; then
+        fatal "$tool not found after package installation"
+    fi
+done
+ok "Cross-compiler: $($MINGW_CC --version | head -1)"
+
+# -------------------------------------------------------------------
+# 3. Кросс-компиляция OpenSSL
+# -------------------------------------------------------------------
+OPENSSL_SRC="$BUILD_DIR/openssl-${OPENSSL_VER}"
+LIBCRYPTO="$PREFIX/lib/libcrypto.a"
+
+if [ -f "$LIBCRYPTO" ]; then
+    ok "OpenSSL already built: $LIBCRYPTO"
+else
+    step "Building OpenSSL ${OPENSSL_VER} for Windows..."
+
+    mkdir -p "$BUILD_DIR"
+
+    TARBALL="$BUILD_DIR/openssl-${OPENSSL_VER}.tar.gz"
+    if [ ! -f "$TARBALL" ]; then
+        echo "  Downloading OpenSSL ${OPENSSL_VER}..."
+        if command -v wget &>/dev/null; then
+            wget -q --show-progress -O "$TARBALL" "$OPENSSL_URL" || fatal "wget download failed for $OPENSSL_URL"
+        else
+            curl -L --progress-bar -o "$TARBALL" "$OPENSSL_URL" || fatal "curl download failed for $OPENSSL_URL"
+        fi
+        ok "Downloaded: $TARBALL"
+    fi
+
+    if [ ! -d "$OPENSSL_SRC" ]; then
+        echo "  Extracting..."
+        tar xzf "$TARBALL" -C "$BUILD_DIR" || fatal "tar extract failed"
+    fi
+
+    echo "  Configuring OpenSSL for mingw64..."
+    cd "$OPENSSL_SRC"
+    ./Configure --cross-compile-prefix=x86_64-w64-mingw32- \
+        mingw64 no-shared no-tests \
+        --prefix="$PREFIX" --libdir="$PREFIX/lib" --openssldir="$PREFIX/ssl" \
+        || fatal "OpenSSL configure failed (see output above)"
+    ok "OpenSSL configured"
+
+    echo "  Compiling OpenSSL..."
+    make -j"$(nproc)" || fatal "OpenSSL make failed"
+    echo "  Installing OpenSSL..."
+    make install_sw >/dev/null || fatal "OpenSSL make install_sw failed"
+    cd "$SCRIPT_DIR"
+
+    # OpenSSL может установить в lib64/ вместо lib/ — поправим
+    if [ ! -f "$LIBCRYPTO" ] && [ -f "$PREFIX/lib64/libcrypto.a" ]; then
+        ln -sf lib64 "$PREFIX/lib" 2>/dev/null || cp -r "$PREFIX/lib64" "$PREFIX/lib" 2>/dev/null || true
+    fi
+    if [ ! -f "$LIBCRYPTO" ]; then
+        fatal "libcrypto.a was not found at $PREFIX/lib/ or $PREFIX/lib64/"
+    fi
+    ok "OpenSSL built: $LIBCRYPTO"
+fi
+
+# -------------------------------------------------------------------
+# 4. Сборка libuasync.a
+# -------------------------------------------------------------------
+step "Building libuasync.a..."
+
+LIB_OBJDIR="$BUILD_DIR/lib-objs"
+mkdir -p "$LIB_OBJDIR"
+
+# Все .c файлы из lib/Makefile.am + myip.c (реализация get_my_ip)
+LIB_SOURCES=(
+    u_async.c ll_queue.c memory_pool.c debug_config.c timeout_heap.c
+    sha256.c mem.c serialize.c swm_min.c getmyip.c radix.c tcp_io.c
+    myip.c platform_compat.c socket_compat.c
+    liblmdb/mdb.c liblmdb/midl.c
+)
+
+LIB_CFLAGS="-D_ISOC99_SOURCE -DDEBUG_OUTPUT_STDERR -DUSE_OPENSSL"
+LIB_CFLAGS+=" -I$SCRIPT_DIR/lib -I$SCRIPT_DIR/src -I$SCRIPT_DIR/lib/liblmdb"
+LIB_CFLAGS+=" -I$PREFIX/include"
+LIB_CFLAGS+=" -g -O2 -Wno-deprecated-declarations"
+
+for src in "${LIB_SOURCES[@]}"; do
+    obj="$LIB_OBJDIR/$(basename "${src%.c}.o")"
+    echo "  CC lib/$src"
+    "$MINGW_CC" $LIB_CFLAGS -c "$SCRIPT_DIR/lib/$src" -o "$obj" \
+        || fatal "compilation failed: lib/$src"
+done
+
+"$MINGW_AR" crs "$BUILD_DIR/libuasync.a" "$LIB_OBJDIR"/*.o \
+    || fatal "ar failed for libuasync.a"
+"$MINGW_RANLIB" "$BUILD_DIR/libuasync.a" 2>/dev/null || true
+ok "libuasync.a ($(wc -c < "$BUILD_DIR/libuasync.a") bytes)"
+
+# -------------------------------------------------------------------
+# 5. Сборка объектных файлов для utun.exe
+# -------------------------------------------------------------------
+step "Compiling utun source files..."
+
+SRC_OBJDIR="$BUILD_DIR/src-objs"
+mkdir -p "$SRC_OBJDIR"
+
+# Все .c файлы из src/Makefile.am (utun_CORE_SOURCES)
+SRC_SOURCES=(
+    utun.c utun_instance.c config_parser.c config_updater.c
+    route_lib.c route6_lib.c route_bgp.c route_ping.c
+    route_node.c route_node_lmdb.c route_connectivity.c conn_mgr.c
+    routing.c tun_if.c tun_route.c tun_linux.c tun_freebsd.c tun_windows.c
+    etcp.c etcp_connections.c etcp_bbr.c etcp_loadbalancer.c
+    etcp_debug.c etcp_dump.c secure_channel.c crc32.c
+    stcp_link.c stcp.c stcp_server.c stcp_client.c
+    pkt_normalizer.c packet_dump.c etcp_api.c
+    control_server.c msg_transport.c
+    firewall.c eim_nat.c nat_transport.c dummynet.c
+    etcp_router.c
+    proxy/udp_proxy.c proxy/socks_proxy.c
+    lwip_tcp/lwip_pbuf.c
+)
+
+SRC_CFLAGS="-DUSE_OPENSSL"
+SRC_CFLAGS+=" -I$SCRIPT_DIR/src -I$SCRIPT_DIR/lib -I$SCRIPT_DIR/lib/liblmdb"
+SRC_CFLAGS+=" -I$SCRIPT_DIR/tinycrypt/lib/include -I$SCRIPT_DIR/tinycrypt/lib/source"
+SRC_CFLAGS+=" -I$PREFIX/include"
+SRC_CFLAGS+=" -g -O2 -Wno-deprecated-declarations"
+
+TOTAL=${#SRC_SOURCES[@]}
+CURRENT=0
+FAILED=()
+
+for src in "${SRC_SOURCES[@]}"; do
+    CURRENT=$((CURRENT + 1))
+    # Имя объектного файла: заменяем / на _ (для proxy/ и lwip_tcp/)
+    obj_name="$(echo "$src" | tr '/' '_')"
+    obj="$SRC_OBJDIR/${obj_name%.c}.o"
+    printf "  [%3d/%3d] CC src/%s\n" "$CURRENT" "$TOTAL" "$src"
+    if ! "$MINGW_CC" $SRC_CFLAGS -c "$SCRIPT_DIR/src/$src" -o "$obj" 2>&1; then
+        FAILED+=("src/$src")
+    fi
+done
+
+if [ ${#FAILED[@]} -gt 0 ]; then
+    echo ""
+    fatal "compilation failed for: ${FAILED[*]}"
+fi
+ok "All $TOTAL source files compiled"
+
+# -------------------------------------------------------------------
+# 6. Линковка utun.exe
+# -------------------------------------------------------------------
+step "Linking utun.exe..."
+
+"$MINGW_CC" -o "$SCRIPT_DIR/utun.exe" \
+    "$SRC_OBJDIR"/*.o \
+    "$BUILD_DIR/libuasync.a" \
+    "$LIBCRYPTO" \
+    -lws2_32 -liphlpapi -ladvapi32 -lbcrypt -lcrypt32 -lpthread -lm \
+    -static \
+    || fatal "linking failed (see undefined references above)"
+
+ok "utun.exe ($(wc -c < "$SCRIPT_DIR/utun.exe") bytes)"
+
+# -------------------------------------------------------------------
+# 7. Копирование wintun.dll и финал
+# -------------------------------------------------------------------
+echo ""
+if [ -f "$SCRIPT_DIR/lib/wintun.dll" ]; then
+    cp "$SCRIPT_DIR/lib/wintun.dll" "$SCRIPT_DIR/"
+    ok "wintun.dll copied to project root"
+else
+    warn "wintun.dll not found in lib/ — place it manually alongside utun.exe"
+fi
+
+echo ""
+echo -e "${GREEN}==============================================${NC}"
+echo -e "${GREEN}  Build successful!${NC}"
+echo -e "${GREEN}  Binary: utun.exe${NC}"
+echo -e "${GREEN}==============================================${NC}"
+echo ""
+
+if [ -f "$SCRIPT_DIR/lib/wintun.dll" ]; then
+    echo "Run on Windows:"
+    echo "  1. Install Wintun driver (https://www.wintun.net)"
+    echo "  2. Copy utun.exe + wintun.dll to the same directory"
+    echo "  3. Run: utun.exe -f -p utun.pid -l utun.log"
+else
+    echo "Run on Windows:"
+    echo "  1. Install Wintun driver (https://www.wintun.net)"
+    echo "  2. Copy utun.exe + wintun.dll to the same directory"
+    echo "  3. Run: utun.exe -f -p utun.pid -l utun.log"
+fi
+echo ""
+
+exit 0