diff --git a/app/controllers/cwmp_controller.ts b/app/controllers/cwmp_controller.ts
index dbecf0c..1bd268c 100644
--- a/app/controllers/cwmp_controller.ts
+++ b/app/controllers/cwmp_controller.ts
@@ -200,13 +200,14 @@ export default class CwmpController {
 
     logger.info({ events }, 'CWMP Inform events extracted')
 
-    // Track last periodic inform timestamp
+    // Track last periodic inform timestamp + last remote IP (used for Connection Request fallback)
     const normalizedEvents = events.map((e) => normalizeEventCode(e))
     const isPeriodic = normalizedEvents.some((e) => e === 'PERIODIC')
     const isBootstrap = normalizedEvents.some((e) => e === 'BOOTSTRAP')
-    if (isPeriodic || isBootstrap) {
-      await DeviceModel.updateOne({ identifier: hashId }, { $set: { lastPeriodicInformAt: new Date() } }).catch(() => {})
-    }
+    const cpeIpForStorage = (xForwardedFor || '').split(',')[0]?.trim() || remoteKey.split(':')[0]
+    const dbUpdate: Record<string, any> = { lastRemoteIp: cpeIpForStorage }
+    if (isPeriodic || isBootstrap) dbUpdate.lastPeriodicInformAt = new Date()
+    await DeviceModel.updateOne({ identifier: hashId }, { $set: dbUpdate }).catch(() => {})
 
     // Phase 12: Crash pattern detection
     const hasBoot = normalizedEvents.some((e) => e === 'BOOT')
diff --git a/app/domain/device/device_record.ts b/app/domain/device/device_record.ts
index 36748b3..2d2b51c 100644
--- a/app/domain/device/device_record.ts
+++ b/app/domain/device/device_record.ts
@@ -19,6 +19,7 @@ export interface DeviceRecord {
   provisioningCode?: string
   references?: DeviceReference[]
   lastPeriodicInformAt?: Date
+  lastRemoteIp?: string
   updatedAt?: Date
   createdAt?: Date
 }
diff --git a/app/services/device_service.ts b/app/services/device_service.ts
index 9599ce1..d81d8d0 100644
--- a/app/services/device_service.ts
+++ b/app/services/device_service.ts
@@ -159,61 +159,74 @@ export default class DeviceService {
   }
 
   private async sendWakeOnWlan(connectionRequestURL: URL, device: DeviceRecord): Promise<boolean> {
-    try {
-      // Use ConnectionRequest credentials from device properties/parameters
-      // Fallback chain: ConnectionRequestUsername > ManagementServer.Username > OUI-ProductClass-Serial
-      const allParams = [...(device.properties || []), ...(device.parameters || [])]
+    // Use ConnectionRequest credentials from device properties/parameters
+    // Fallback chain: ConnectionRequestUsername > ManagementServer.Username > OUI-ProductClass-Serial
+    const allParams = [...(device.properties || []), ...(device.parameters || [])]
 
-      const connReqUsername = allParams.find((p: any) =>
-        p.name?.includes('ConnectionRequestUsername')
-      )
-      const connReqPassword = allParams.find((p: any) =>
-        p.name?.includes('ConnectionRequestPassword')
-      )
-      const mgmtUsername = allParams.find((p: any) => p.name?.endsWith('ManagementServer.Username'))
-      const mgmtPassword = allParams.find((p: any) => p.name?.endsWith('ManagementServer.Password'))
+    const connReqUsername = allParams.find((p: any) => p.name?.includes('ConnectionRequestUsername'))
+    const connReqPassword = allParams.find((p: any) => p.name?.includes('ConnectionRequestPassword'))
+    const mgmtUsername = allParams.find((p: any) => p.name?.endsWith('ManagementServer.Username'))
+    const mgmtPassword = allParams.find((p: any) => p.name?.endsWith('ManagementServer.Password'))
 
-      // genieacs-sim uses ManagementServer.Username/Password for CR auth (non-standard)
-      // Real CPEs use ConnectionRequestUsername/Password
-      const username =
-        mgmtUsername?.value ||
-        connReqUsername?.value ||
-        `${device.deviceId.oui}-${device.deviceId.productClass}-${device.deviceId.serialNumber}`
-      const password = mgmtPassword?.value ?? connReqPassword?.value ?? ''
+    // genieacs-sim uses ManagementServer.Username/Password for CR auth (non-standard)
+    // Real CPEs use ConnectionRequestUsername/Password
+    const username =
+      mgmtUsername?.value ||
+      connReqUsername?.value ||
+      `${device.deviceId.oui}-${device.deviceId.productClass}-${device.deviceId.serialNumber}`
+    const password = mgmtPassword?.value ?? connReqPassword?.value ?? ''
+    const basicAuth = Buffer.from(`${username}:${password}`).toString('base64')
+    const headers = { Authorization: `Basic ${basicAuth}` }
 
-      logger.info({ url: connectionRequestURL.toString(), username }, 'Sending Connection Request')
+    // Build list of URLs to try:
+    // 1. Original ConnectionRequestURL (may be IPv6)
+    // 2. Fallback: same path but with lastRemoteIp (IPv4 public IP from last Inform)
+    const urlsToTry: URL[] = [connectionRequestURL]
 
-      const basicAuth = Buffer.from(`${username}:${password}`).toString('base64')
-      const response = await fetch(connectionRequestURL.toString(), {
-        method: 'GET',
-        headers: {
-          Authorization: `Basic ${basicAuth}`,
-        },
-      })
-
-      if (!response.ok) {
-        logger.error(
-          {
-            status: response.status,
-            statusText: response.statusText,
-            url: connectionRequestURL.toString(),
-          },
-          'Connection Request failed with non-OK status'
+    const lastRemoteIp = (device as any).lastRemoteIp as string | undefined
+    if (lastRemoteIp && lastRemoteIp !== connectionRequestURL.hostname.replace(/^\[|\]$/g, '')) {
+      try {
+        const fallbackUrl = new URL(connectionRequestURL.toString())
+        // IPv6 hostnames need brackets in URL
+        fallbackUrl.hostname = lastRemoteIp.includes(':') ? `[${lastRemoteIp}]` : lastRemoteIp
+        urlsToTry.push(fallbackUrl)
+        logger.info(
+          { original: connectionRequestURL.toString(), fallback: fallbackUrl.toString() },
+          '[ConnectionRequest] IPv4 fallback URL prepared'
         )
-        return false
+      } catch {
+        // ignore invalid fallback URL
       }
-      logger.info(
-        { status: response.status, url: connectionRequestURL.toString() },
-        'Connection Request successful'
-      )
-      return true
-    } catch (error: any) {
-      logger.error(
-        { error: error?.message, code: error?.cause?.code, url: connectionRequestURL.toString() },
-        'Connection Request network error'
-      )
-      return false
     }
+
+    for (const url of urlsToTry) {
+      try {
+        logger.info({ url: url.toString(), username }, 'Sending Connection Request')
+        const response = await fetch(url.toString(), { method: 'GET', headers })
+
+        if (!response.ok) {
+          logger.error(
+            { status: response.status, statusText: response.statusText, url: url.toString() },
+            'Connection Request failed with non-OK status'
+          )
+          continue // try next URL
+        }
+        logger.info({ status: response.status, url: url.toString() }, 'Connection Request successful')
+        return true
+      } catch (error: any) {
+        logger.warn(
+          { error: error?.message, code: error?.cause?.code, url: url.toString() },
+          '[ConnectionRequest] URL failed, trying next if available'
+        )
+        // try next URL
+      }
+    }
+
+    logger.error(
+      { urls: urlsToTry.map((u) => u.toString()) },
+      'Connection Request failed on all URLs'
+    )
+    return false
   }
 
   calculatePagination(offset: number, limit: number, total: number): PaginationData {