diff --git a/backend/src/utilities/capture_pipeline.py b/backend/src/utilities/capture_pipeline.py
index 86087f4..df96bde 100644
--- a/backend/src/utilities/capture_pipeline.py
+++ b/backend/src/utilities/capture_pipeline.py
@@ -13,6 +13,21 @@ from src.config import settings
 logger = logging.getLogger("capture_pipeline")
 
 
+def _run_checked(cmd: list[str]) -> subprocess.CompletedProcess[str]:
+    """Run a command and surface stdout/stderr in raised errors."""
+    try:
+        return subprocess.run(cmd, check=True, capture_output=True, text=True)
+    except subprocess.CalledProcessError as exc:
+        stdout = (exc.stdout or "").strip()
+        stderr = (exc.stderr or "").strip()
+        if stdout:
+            logger.error("Command stdout for %s:\n%s", cmd[0], stdout)
+        if stderr:
+            logger.error("Command stderr for %s:\n%s", cmd[0], stderr)
+        detail = stderr or stdout or str(exc)
+        raise RuntimeError(detail) from exc
+
+
 class CapturePipelineManager:
     """Reference-count mirrored capture pipelines per bridge."""
 
@@ -107,7 +122,7 @@ class CapturePipelineManager:
             mirror_if,
             capture_if,
         )
-        subprocess.run(cmd, check=True, capture_output=True, text=True)
+        _run_checked(cmd)
         self._active[bridge] = {
             "mirror_if": mirror_if,
             "capture_if": capture_if,
@@ -134,7 +149,7 @@ class CapturePipelineManager:
             mirror_if,
             capture_if,
         )
-        subprocess.run(cmd, check=True, capture_output=True, text=True)
+        _run_checked(cmd)
 
     def _repo_root(self) -> Path:
         return Path(__file__).resolve().parents[3]
diff --git a/tools/setup_bridge_capture.sh b/tools/setup_bridge_capture.sh
index 30ea623..303ac87 100755
--- a/tools/setup_bridge_capture.sh
+++ b/tools/setup_bridge_capture.sh
@@ -36,8 +36,13 @@ if [[ -z "$BRIDGE" ]]; then
   exit 1
 fi
 
-if ! command -v tc >/dev/null 2>&1 || ! command -v clang >/dev/null 2>&1; then
-  echo "Missing required tools: tc and clang must be installed." >&2
+if ! command -v tc >/dev/null 2>&1 || ! command -v clang >/dev/null 2>&1 || ! command -v ip >/dev/null 2>&1 || ! command -v bridge >/dev/null 2>&1; then
+  echo "Missing required tools: tc, clang, ip, and bridge must be installed." >&2
+  exit 1
+fi
+
+if ! ip link show "$BRIDGE" >/dev/null 2>&1; then
+  echo "Bridge interface not found: $BRIDGE" >&2
   exit 1
 fi
 
@@ -46,9 +51,16 @@ SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 SRC_DIR="$SCRIPT_DIR/ebpf"
 MARK_OBJ="$BUILD_DIR/mark_packet_id.o"
 CAPTURE_OBJ="$BUILD_DIR/prepend_capture_header.o"
+MULTIARCH_INCLUDE=""
+if command -v gcc >/dev/null 2>&1; then
+  GCC_TRIPLE="$(gcc -dumpmachine 2>/dev/null || true)"
+  if [[ -n "$GCC_TRIPLE" && -d "/usr/include/$GCC_TRIPLE" ]]; then
+    MULTIARCH_INCLUDE="-I/usr/include/$GCC_TRIPLE"
+  fi
+fi
 
-clang -O2 -g -target bpf -c "$SRC_DIR/mark_packet_id.c" -o "$MARK_OBJ"
-clang -O2 -g -target bpf -c "$SRC_DIR/prepend_capture_header.c" -o "$CAPTURE_OBJ"
+clang -O2 -g -target bpf ${MULTIARCH_INCLUDE:+$MULTIARCH_INCLUDE} -c "$SRC_DIR/mark_packet_id.c" -o "$MARK_OBJ"
+clang -O2 -g -target bpf ${MULTIARCH_INCLUDE:+$MULTIARCH_INCLUDE} -c "$SRC_DIR/prepend_capture_header.c" -o "$CAPTURE_OBJ"
 
 if ! ip link show "$MIRROR_IF" >/dev/null 2>&1; then
   ip link add "$MIRROR_IF" type veth peer name "$CAPTURE_IF"