diff --git a/public/api/snmp_status.php b/public/api/snmp_status.php
index ea85338..4d26b23 100644
--- a/public/api/snmp_status.php
+++ b/public/api/snmp_status.php
@@ -38,6 +38,18 @@ function log_msg(string $msg): void {
     @file_put_contents($logFile, "[$timestamp] $msg\n", FILE_APPEND);
 }
 
+function rotate_log_if_needed(): void {
+    global $logFile;
+    $maxSize = 500 * 1024; // 500 KB (anpassbar)
+    
+    if (file_exists($logFile) && filesize($logFile) > $maxSize) {
+        $backupFile = $logFile . '.old';
+        @rename($logFile, $backupFile);
+        log_msg('=== Log rotiert (alte Datei: .old) ===');
+    }
+}
+
+
 $configPath = __DIR__ . '/../../config/config.php';
 if (!is_readable($configPath)) {
     log_msg('ERROR: config.php nicht lesbar');
@@ -48,6 +60,8 @@ if (!is_readable($configPath)) {
 $config = require $configPath;
 $snmp = $config['snmp'] ?? [];
 
+rotate_log_if_needed();
+
 log_msg('--- SNMP-Abfrage gestartet ---');
 
 // === Cache-Logik (Datei) ===