diff --git a/backend/server.js b/backend/server.js
index 96ec6bf..11d75ff 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -26,6 +26,35 @@ const s3 = new AWS.S3({
 const BUCKET_NAME = process.env.S3_BUCKET_NAME;
 const FILE_KEY = 'bgp_data/domains.txt';
 
+// Helper: build MikroTik nested if/else blocks (RouterOS v7 filter language does not support 'else if')
+function buildNestedGatewayBlocks(gatewayGroups, baseIndentSpaces = 4) {
+    const indent = (n) => ' '.repeat(n);
+    const entries = Object.entries(gatewayGroups);
+    if (entries.length === 0) return '';
+
+    function buildAt(index, pad) {
+        const [gateway, communities] = entries[index];
+        let s = '';
+        s += `${indent(pad)}if (\n`;
+        communities.forEach((community, i) => {
+            s += `${indent(pad + 4)}(bgp-communities includes ${community})`;
+            if (i < communities.length - 1) s += ' or \n';
+        });
+        s += `\n${indent(pad)})\n`;
+        s += `${indent(pad)}{\n${indent(pad + 8 - 4)}set gw ${gateway}; accept;\n${indent(pad)}}\n`;
+        if (index < entries.length - 1) {
+            s += `${indent(pad)}else\n${indent(pad)}{\n`;
+            s += buildAt(index + 1, pad + 4);
+            s += `\n${indent(pad)}}`;
+        } else {
+            s += `${indent(pad)}else\n${indent(pad)}{\n${indent(pad + 4)}reject;\n${indent(pad)}}`;
+        }
+        return s;
+    }
+
+    return buildAt(0, baseIndentSpaces);
+}
+
 // Get domains from S3
 app.get('/api/domains', async (req, res) => {
     const params = {
@@ -608,42 +637,8 @@ app.get('/api/filters/generate-config', async (req, res) => {
         config += `// Date: ${new Date().toISOString()}\n\n`;
         config += '/routing filter bgp-in-tmp {\n';
 
-        // Если есть только один gateway, создаем простую конфигурацию
-        if (Object.keys(gatewayGroups).length === 1) {
-            const [gateway, communities] = Object.entries(gatewayGroups)[0];
-            config += `    if (\n`;
-            communities.forEach((community, index) => {
-                config += `    (bgp-communities includes ${community})`;
-                if (index < communities.length - 1) {
-                    config += ` or \n`;
-                }
-            });
-            config += `\n    )\n    {\n        set gw ${gateway}; accept;\n    }\n    else\n    {\n     reject;\n    }\n`;
-        } else {
-            // Если несколько gateway, создаем каскадную структуру
-            const gatewayEntries = Object.entries(gatewayGroups);
-            gatewayEntries.forEach(([gateway, communities], gatewayIndex) => {
-                if (gatewayIndex === 0) {
-                    config += `    if (\n`;
-                } else {
-                    config += `    else if (\n`;
-                }
-                
-                communities.forEach((community, index) => {
-                    config += `    (bgp-communities includes ${community})`;
-                    if (index < communities.length - 1) {
-                        config += ` or \n`;
-                    }
-                });
-                config += `\n    )\n    {\n        set gw ${gateway}; accept;\n    }`;
-                
-                if (gatewayIndex === gatewayEntries.length - 1) {
-                    config += `\n    else\n    {\n     reject;\n    }\n`;
-                } else {
-                    config += `\n`;
-                }
-            });
-        }
+        // Строим вложенные if/else (RouterOS не поддерживает else if в данном контексте)
+        config += buildNestedGatewayBlocks(gatewayGroups, 4);
         
         config += '}\n';
 
@@ -698,42 +693,8 @@ app.post('/api/filters/export-config', async (req, res) => {
         config += `// Date: ${new Date().toISOString()}\n\n`;
         config += '/routing filter bgp-in-tmp {\n';
 
-        // Если есть только один gateway, создаем простую конфигурацию
-        if (Object.keys(gatewayGroups).length === 1) {
-            const [gateway, communities] = Object.entries(gatewayGroups)[0];
-            config += `    if (\n`;
-            communities.forEach((community, index) => {
-                config += `    (bgp-communities includes ${community})`;
-                if (index < communities.length - 1) {
-                    config += ` or \n`;
-                }
-            });
-            config += `\n    )\n    {\n        set gw ${gateway}; accept;\n    }\n    else\n    {\n     reject;\n    }\n`;
-        } else {
-            // Если несколько gateway, создаем каскадную структуру
-            const gatewayEntries = Object.entries(gatewayGroups);
-            gatewayEntries.forEach(([gateway, communities], gatewayIndex) => {
-                if (gatewayIndex === 0) {
-                    config += `    if (\n`;
-                } else {
-                    config += `    else if (\n`;
-                }
-                
-                communities.forEach((community, index) => {
-                    config += `    (bgp-communities includes ${community})`;
-                    if (index < communities.length - 1) {
-                        config += ` or \n`;
-                    }
-                });
-                config += `\n    )\n    {\n        set gw ${gateway}; accept;\n    }`;
-                
-                if (gatewayIndex === gatewayEntries.length - 1) {
-                    config += `\n    else\n    {\n     reject;\n    }\n`;
-                } else {
-                    config += `\n`;
-                }
-            });
-        }
+        // Строим вложенные if/else (RouterOS не поддерживает else if в данном контексте)
+        config += buildNestedGatewayBlocks(gatewayGroups, 4);
         
         config += '}\n';
 
@@ -977,42 +938,8 @@ app.post('/api/server-filters/generate-config', async (req, res) => {
     config += `// Date: ${new Date().toISOString()}\n\n`;
     config += '/routing filter bgp-in-tmp {\n';
 
-    // Если есть только один gateway, создаем простую конфигурацию
-    if (Object.keys(gatewayGroups).length === 1) {
-        const [gateway, communities] = Object.entries(gatewayGroups)[0];
-        config += `    if (\n`;
-        communities.forEach((community, index) => {
-            config += `    (bgp-communities includes ${community})`;
-            if (index < communities.length - 1) {
-                config += ` or \n`;
-            }
-        });
-        config += `\n    )\n    {\n        set gw ${gateway}; accept;\n    }\n    else\n    {\n     reject;\n    }\n`;
-    } else {
-        // Если несколько gateway, создаем каскадную структуру
-        const gatewayEntries = Object.entries(gatewayGroups);
-        gatewayEntries.forEach(([gateway, communities], gatewayIndex) => {
-            if (gatewayIndex === 0) {
-                config += `    if (\n`;
-            } else {
-                config += `    else if (\n`;
-            }
-            
-            communities.forEach((community, index) => {
-                config += `    (bgp-communities includes ${community})`;
-                if (index < communities.length - 1) {
-                    config += ` or \n`;
-                }
-            });
-            config += `\n    )\n    {\n        set gw ${gateway}; accept;\n    }`;
-            
-            if (gatewayIndex === gatewayEntries.length - 1) {
-                config += `\n    else\n    {\n     reject;\n    }\n`;
-            } else {
-                config += `\n`;
-            }
-        });
-    }
+    // Строим вложенные if/else (RouterOS не поддерживает else if в данном контексте)
+    config += buildNestedGatewayBlocks(gatewayGroups, 4);
     
     config += '}\n';