diff --git a/backend/config.py b/backend/config.py
index 88c287b..23657fe 100644
--- a/backend/config.py
+++ b/backend/config.py
@@ -12,13 +12,20 @@ class Settings(BaseSettings):
     media_origin_hls_port: int = 8888
 
     edge_nodes: list[dict] = [
-        {"id": "edge-1", "name": "Edge Node 1", "host": "127.0.0.1",
-         "hls_port": 8889, "api_port": 9998, "weight": 100, "enabled": True},
-        {"id": "edge-2", "name": "Edge Node 2", "host": "127.0.0.1",
-         "hls_port": 8890, "api_port": 9999, "weight": 50, "enabled": True},
+        {
+            "id": "default",
+            "name": "Origin (Default)",
+            "host": "127.0.0.1",
+            "hls_port": 8888,
+            "api_port": 9997,
+            "weight": 100,
+            "enabled": True,
+            "subnet": "0.0.0.0/0",
+            "is_origin": True,
+        },
     ]
 
-    load_balance_strategy: Literal["round-robin", "weighted", "least-conn"] = "weighted"
+    load_balance_strategy: Literal["round-robin", "weighted", "least-conn", "subnet"] = "subnet"
 
     qualities: list[dict] = [
         {"label": "1080p", "width": 1920, "height": 1080, "bitrate": "5000k"},
diff --git a/backend/routes/nodes.py b/backend/routes/nodes.py
index 123926a..7edf5bb 100644
--- a/backend/routes/nodes.py
+++ b/backend/routes/nodes.py
@@ -1,5 +1,6 @@
 from fastapi import APIRouter, HTTPException, Depends
 from pydantic import BaseModel
+from typing import Optional
 from config import settings
 from routes.auth import require_auth
 from services.load_balancer import lb
@@ -11,6 +12,7 @@ router = APIRouter(prefix="/api/nodes", tags=["nodes"])
 class NodeUpdate(BaseModel):
     weight: int
     enabled: bool | None = None
+    subnet: str | None = None
 
 
 class StrategyUpdate(BaseModel):
@@ -18,18 +20,42 @@ class StrategyUpdate(BaseModel):
     multicast_enabled: bool | None = None
 
 
+class NodeHeartbeat(BaseModel):
+    node_id: str
+    cpu_percent: float | None = None
+    memory_percent: float | None = None
+    bandwidth_mbps: float | None = None
+    active_connections: int | None = None
+    hls_readers: int | None = None
+
+
+class NodeRegister(BaseModel):
+    node_id: str
+    name: str
+    host: str
+    hls_port: int
+    api_port: int
+    weight: int = 100
+    subnet: str = "0.0.0.0/0"
+
+
 @router.get("")
 async def list_nodes(_: bool = Depends(require_auth)):
     nodes = []
     for n in settings.edge_nodes:
+        nid = n["id"]
         nodes.append({
-            "id": n["id"],
+            "id": nid,
             "name": n["name"],
             "host": n["host"],
             "hls_port": n["hls_port"],
             "api_port": n["api_port"],
             "weight": n["weight"],
             "enabled": n.get("enabled", True),
+            "subnet": n.get("subnet", "0.0.0.0/0"),
+            "is_origin": n.get("is_origin", False),
+            "online": lb.is_online(nid),
+            "metrics": lb._node_health.get(nid),
         })
     return nodes
 
@@ -45,7 +71,7 @@ async def get_strategy(_: bool = Depends(require_auth)):
 
 @router.put("/strategy")
 async def update_strategy(body: StrategyUpdate, _: bool = Depends(require_auth)):
-    if body.strategy in ("round-robin", "weighted", "least-conn"):
+    if body.strategy in ("round-robin", "weighted", "least-conn", "subnet"):
         settings.load_balance_strategy = body.strategy
     if body.multicast_enabled is not None:
         settings.multicast_enabled = body.multicast_enabled
@@ -60,8 +86,54 @@ async def update_node(node_id: str, body: NodeUpdate, _: bool = Depends(require_
             n["weight"] = body.weight
             if body.enabled is not None:
                 n["enabled"] = body.enabled
+            if body.subnet is not None:
+                n["subnet"] = body.subnet
             found = True
             break
     if not found:
         raise HTTPException(status_code=404, detail="Node not found")
     return {"ok": True}
+
+
+@router.post("/register")
+async def register_node(body: NodeRegister):
+    for n in settings.edge_nodes:
+        if n["id"] == body.node_id:
+            n.update({
+                "name": body.name,
+                "host": body.host,
+                "hls_port": body.hls_port,
+                "api_port": body.api_port,
+                "weight": body.weight,
+                "subnet": body.subnet,
+            })
+            return {"ok": True, "action": "updated"}
+    settings.edge_nodes.append({
+        "id": body.node_id,
+        "name": body.name,
+        "host": body.host,
+        "hls_port": body.hls_port,
+        "api_port": body.api_port,
+        "weight": body.weight,
+        "enabled": True,
+        "subnet": body.subnet,
+        "is_origin": False,
+    })
+    return {"ok": True, "action": "registered"}
+
+
+@router.post("/heartbeat")
+async def node_heartbeat(body: NodeHeartbeat):
+    lb.report_health(body.node_id, {
+        "cpu_percent": body.cpu_percent,
+        "memory_percent": body.memory_percent,
+        "bandwidth_mbps": body.bandwidth_mbps,
+        "active_connections": body.active_connections,
+        "hls_readers": body.hls_readers,
+    })
+    return {"ok": True}
+
+
+@router.get("/health")
+async def get_all_health():
+    return lb.get_health_summary()
diff --git a/backend/routes/streams.py b/backend/routes/streams.py
index ec3cb1d..ce761e0 100644
--- a/backend/routes/streams.py
+++ b/backend/routes/streams.py
@@ -1,4 +1,4 @@
-from fastapi import APIRouter, HTTPException, Depends, Query
+from fastapi import APIRouter, HTTPException, Depends, Query, Request
 from sqlalchemy.ext.asyncio import AsyncSession
 from pydantic import BaseModel
 from typing import Optional
@@ -26,6 +26,18 @@ class StreamUpdate(BaseModel):
     scheduled_at: Optional[str] = None
 
 
+def _get_client_ip(request: Request) -> str | None:
+    forwarded = request.headers.get("X-Forwarded-For")
+    if forwarded:
+        return forwarded.split(",")[0].strip()
+    client = request.headers.get("X-Real-IP")
+    if client:
+        return client
+    if request.client:
+        return request.client.host
+    return None
+
+
 @router.get("")
 async def list_streams(db: AsyncSession = Depends(get_db)):
     svc = StreamService(db)
@@ -114,17 +126,19 @@ async def delete_stream(stream_id: int, db: AsyncSession = Depends(get_db),
 
 
 @router.get("/{stream_id}/watch")
-async def get_watch_urls(stream_id: int, db: AsyncSession = Depends(get_db)):
+async def get_watch_urls(stream_id: int, request: Request, db: AsyncSession = Depends(get_db)):
     svc = StreamService(db)
     stream = await svc.get_stream(stream_id)
     if not stream:
         raise HTTPException(status_code=404, detail="Stream not found")
-    urls = await svc.get_watch_urls(stream.stream_key)
+    client_ip = _get_client_ip(request)
+    urls = await svc.get_watch_urls(stream.stream_key, client_ip)
     return {
         "stream_id": stream.id,
         "title": stream.title,
         "status": stream.status.value,
         "multicast_available": urls["multicast_available"],
+        "selected_node": urls.get("selected_node"),
         "lines": urls["lines"],
         "qualities": urls["qualities"],
     }
@@ -153,12 +167,13 @@ async def stream_end(stream_id: int, db: AsyncSession = Depends(get_db),
 
 
 @router.get("/detail/{stream_key}")
-async def get_stream_by_key(stream_key: str, db: AsyncSession = Depends(get_db)):
+async def get_stream_by_key(stream_key: str, request: Request, db: AsyncSession = Depends(get_db)):
     svc = StreamService(db)
     s = await svc.get_stream_by_key(stream_key)
     if not s:
         raise HTTPException(status_code=404, detail="Stream not found")
-    urls = await svc.get_watch_urls(stream_key)
+    client_ip = _get_client_ip(request)
+    urls = await svc.get_watch_urls(stream_key, client_ip)
     return {
         "stream_id": s.id,
         "title": s.title,
diff --git a/backend/services/load_balancer.py b/backend/services/load_balancer.py
index 411b56d..c6bfc2f 100644
--- a/backend/services/load_balancer.py
+++ b/backend/services/load_balancer.py
@@ -1,43 +1,140 @@
-import json
-import asyncio
-import subprocess
+import ipaddress
+import time
 from config import settings
 
 
 class LoadBalancer:
     def __init__(self):
         self._rr_index = 0
-        self._conn_counts: dict[str, int] = {n["id"]: 0 for n in settings.edge_nodes}
+        self._conn_counts: dict[str, int] = {}
+        self._node_health: dict[str, dict] = {}
 
     def get_enabled_nodes(self):
         return [n for n in settings.edge_nodes if n.get("enabled", True)]
 
-    def select_nodes(self, strategy: str | None = None):
-        nodes = self.get_enabled_nodes()
-        strategy = strategy or settings.load_balance_strategy
+    def get_node_by_id(self, node_id: str):
+        for n in settings.edge_nodes:
+            if n["id"] == node_id:
+                return n
+        return None
 
+    def select_best_node(self, client_ip: str | None = None):
+        nodes = self.get_enabled_nodes()
+        if not nodes:
+            return None
+
+        if client_ip:
+            best = self._find_subnet_match(client_ip, nodes)
+            if best:
+                return best
+
+        strategy = settings.load_balance_strategy
         if strategy == "round-robin":
-            if not nodes:
-                return []
-            chosen = nodes[self._rr_index % len(nodes)]
+            online = [n for n in nodes if self.is_online(n["id"])]
+            if not online:
+                online = nodes
+            chosen = online[self._rr_index % len(online)]
             self._rr_index += 1
-            return [chosen]
+            return chosen
         elif strategy == "weighted":
-            total = sum(n["weight"] for n in nodes)
-            if total == 0:
-                return nodes
-            import random
-            r = random.uniform(0, total)
-            cumulative = 0
-            for n in nodes:
-                cumulative += n["weight"]
-                if r <= cumulative:
-                    return [n]
-            return [nodes[-1]]
+            return self._weighted_select(nodes)
         elif strategy == "least-conn":
-            sorted_nodes = sorted(nodes, key=lambda n: self._conn_counts.get(n["id"], 0))
-            return [sorted_nodes[0]]
-        return nodes
+            return self._least_conn_select(nodes)
+        else:
+            return self._weighted_select(nodes)
+
+    def _find_subnet_match(self, client_ip: str, nodes: list[dict]):
+        try:
+            ip = ipaddress.ip_address(client_ip)
+        except ValueError:
+            return None
+
+        best = None
+        best_prefix = -1
+
+        for node in nodes:
+            if not self.is_online(node["id"]):
+                continue
+
+            subnet_str = node.get("subnet", "0.0.0.0/0")
+            if not subnet_str:
+                continue
+
+            try:
+                subnet = ipaddress.ip_network(subnet_str, strict=False)
+            except ValueError:
+                continue
+
+            if ip in subnet:
+                if subnet.prefixlen > best_prefix:
+                    best_prefix = subnet.prefixlen
+                    best = node
+
+        return best
+
+    def _weighted_select(self, nodes: list[dict]):
+        online = [n for n in nodes if self.is_online(n["id"])]
+        if not online:
+            online = nodes
+        total = sum(n["weight"] for n in online)
+        if total == 0:
+            return online[0] if online else None
+        import random
+        r = random.uniform(0, total)
+        cumulative = 0
+        for n in online:
+            cumulative += n["weight"]
+            if r <= cumulative:
+                return n
+        return online[-1]
+
+    def _least_conn_select(self, nodes: list[dict]):
+        online = [n for n in nodes if self.is_online(n["id"])]
+        if not online:
+            online = nodes
+        sorted_nodes = sorted(online, key=lambda n: self._conn_counts.get(n["id"], 0))
+        return sorted_nodes[0] if sorted_nodes else None
+
+    def report_health(self, node_id: str, metrics: dict):
+        self._node_health[node_id] = {
+            "last_seen": time.time(),
+            "online": True,
+            **metrics,
+        }
+
+    def is_online(self, node_id: str) -> bool:
+        h = self._node_health.get(node_id)
+        if h is None:
+            if any(n["id"] == node_id and n.get("is_origin") for n in settings.edge_nodes):
+                return True
+            return False
+        if time.time() - h.get("last_seen", 0) > 30:
+            return False
+        return h.get("online", False)
+
+    def get_health_summary(self):
+        result = {}
+        for node in settings.edge_nodes:
+            nid = node["id"]
+            h = self._node_health.get(nid)
+            result[nid] = {
+                "name": node["name"],
+                "host": node["host"],
+                "online": self.is_online(nid),
+                "weight": node["weight"],
+                "enabled": node.get("enabled", True),
+                "subnet": node.get("subnet"),
+                "is_origin": node.get("is_origin", False),
+                "last_seen": h.get("last_seen") if h else None,
+                "metrics": {
+                    "cpu_percent": h.get("cpu_percent"),
+                    "memory_percent": h.get("memory_percent"),
+                    "bandwidth_mbps": h.get("bandwidth_mbps"),
+                    "active_connections": h.get("active_connections"),
+                    "hls_readers": h.get("hls_readers"),
+                } if h else None,
+            }
+        return result
 
     def increment_connection(self, node_id: str):
         self._conn_counts[node_id] = self._conn_counts.get(node_id, 0) + 1
diff --git a/backend/services/stream_service.py b/backend/services/stream_service.py
index ff7c8cb..f1607e9 100644
--- a/backend/services/stream_service.py
+++ b/backend/services/stream_service.py
@@ -69,12 +69,6 @@ class StreamService:
                 status=StreamStatus.live,
                 started_at=datetime.utcnow(),
             )
-            assigned = [n["id"] for n in lb.get_enabled_nodes()]
-            await self.update_stream(
-                stream.id,
-                assigned_nodes=json.dumps(assigned),
-                multicast_enabled=multicast_detector.is_available(),
-            )
             rtmp_url = media_service.get_rtmp_url(stream_key)
             transcode_mgr.start_transcode(stream_key, rtmp_url)
 
@@ -89,20 +83,22 @@ class StreamService:
             )
             transcode_mgr.stop_transcode(stream_key)
 
-    async def get_watch_urls(self, stream_key: str):
-        nodes = lb.get_enabled_nodes()
+    async def get_watch_urls(self, stream_key: str, client_ip: str | None = None):
+        best_node = lb.select_best_node(client_ip)
+        if not best_node:
+            best_node = lb.get_enabled_nodes()[0] if lb.get_enabled_nodes() else None
+
         lines = []
-        for node in nodes:
+        if best_node:
+            base_hls = f"/hls/{stream_key}"
             line_info = {
-                "node_id": node["id"],
-                "node_name": node["name"],
-                "weight": node["weight"],
+                "node_id": best_node["id"],
+                "node_name": best_node["name"],
+                "weight": best_node["weight"],
+                "type": "hls",
+                "url": f"{base_hls}/index.m3u8",
                 "qualities": [],
             }
-            base_hls = f"/hls/{stream_key}"
-            line_info["type"] = "hls"
-            line_info["url"] = f"{base_hls}/index.m3u8"
-
             for quality in settings.qualities:
                 label = quality["label"]
                 line_info["qualities"].append({
diff --git a/frontend/src/admin/pages/NodeManager.tsx b/frontend/src/admin/pages/NodeManager.tsx
index ac1724a..7b31003 100644
--- a/frontend/src/admin/pages/NodeManager.tsx
+++ b/frontend/src/admin/pages/NodeManager.tsx
@@ -1,12 +1,20 @@
 import { useState, useEffect } from 'react'
 import {
-  Card, Table, InputNumber, Switch, Typography, message, Space, Tag, Statistic, Row, Col, Button,
+  Card, Table, InputNumber, Switch, Typography, message, Space, Tag, Statistic, Row, Col, Button, Tooltip, Progress,
 } from 'antd'
-import { CheckCircleOutlined, CloseCircleOutlined, ReloadOutlined } from '@ant-design/icons'
+import { CheckCircleOutlined, CloseCircleOutlined, ReloadOutlined, DashboardOutlined } from '@ant-design/icons'
 import api from '../../api/client'
 
 const { Title, Text } = Typography
 
+interface NodeMetrics {
+  cpu_percent: number | null
+  memory_percent: number | null
+  bandwidth_mbps: number | null
+  active_connections: number | null
+  hls_readers: number | null
+}
+
 interface NodeInfo {
   id: string
   name: string
@@ -15,6 +23,10 @@ interface NodeInfo {
   api_port: number
   weight: number
   enabled: boolean
+  subnet: string
+  is_origin: boolean
+  online: boolean
+  metrics: NodeMetrics | null
 }
 
 interface StrategyInfo {
@@ -24,6 +36,7 @@ interface StrategyInfo {
 }
 
 const strategyLabels: Record<string, string> = {
+  'subnet': 'Subnet-Aware',
   'round-robin': 'Round-Robin',
   'weighted': 'Weighted',
   'least-conn': 'Least-Conn',
@@ -34,7 +47,7 @@ export default function NodeManager() {
   const [strategy, setStrategy] = useState<StrategyInfo | null>(null)
   const [loading, setLoading] = useState(true)
 
-  useEffect(() => { loadData() }, [])
+  useEffect(() => { loadData(); const t = setInterval(loadData, 10000); return () => clearInterval(t) }, [])
 
   async function loadData() {
     setLoading(true)
@@ -66,42 +79,72 @@ export default function NodeManager() {
     } catch { message.error('Failed') }
   }
 
+  const onlineNodes = nodes.filter((n) => n.online).length
+
   const columns = [
+    {
+      title: 'Status', dataIndex: 'online', key: 'online', width: 80,
+      render: (online: boolean) => (
+        <Tooltip title={online ? 'Online' : 'Offline'}>
+          <Tag icon={online ? <CheckCircleOutlined /> : <CloseCircleOutlined />}
+            color={online ? 'success' : 'error'} />
+        </Tooltip>
+      ),
+    },
     { title: 'Name', dataIndex: 'name', key: 'name' },
-    { title: 'Host', dataIndex: 'host', key: 'host' },
-    { title: 'HLS Port', dataIndex: 'hls_port', key: 'hls_port', width: 100 },
-    { title: 'API Port', dataIndex: 'api_port', key: 'api_port', width: 100 },
+    { title: 'Host', dataIndex: 'host', key: 'host', width: 140 },
+    {
+      title: 'Subnet', dataIndex: 'subnet', key: 'subnet', width: 140,
+      render: (v: string) => <Text code style={{ fontSize: 12 }}>{v}</Text>,
+    },
+    {
+      title: 'CPU', key: 'cpu', width: 80,
+      render: (_: any, r: NodeInfo) => r.metrics?.cpu_percent != null
+        ? <Progress size="small" percent={Math.round(r.metrics.cpu_percent)} strokeColor="#1E3A5F" showInfo={false} />
+        : <Text type="secondary">--</Text>,
+    },
+    {
+      title: 'RAM', key: 'ram', width: 80,
+      render: (_: any, r: NodeInfo) => r.metrics?.memory_percent != null
+        ? <Progress size="small" percent={Math.round(r.metrics.memory_percent)} strokeColor="#1E3A5F" showInfo={false} />
+        : <Text type="secondary">--</Text>,
+    },
+    {
+      title: 'BW', key: 'bw', width: 70,
+      render: (_: any, r: NodeInfo) => r.metrics?.bandwidth_mbps != null
+        ? <Text style={{ fontSize: 12 }}>{r.metrics.bandwidth_mbps.toFixed(1)} Mbps</Text>
+        : <Text type="secondary">--</Text>,
+    },
+    {
+      title: 'Conn', dataIndex: 'connections', key: 'conn', width: 60,
+      render: (_: any, r: NodeInfo) => r.metrics?.active_connections != null
+        ? r.metrics.active_connections
+        : <Text type="secondary">--</Text>,
+    },
     {
       title: 'Weight', dataIndex: 'weight', key: 'weight', width: 140,
       render: (_: number, record: NodeInfo) => (
         <InputNumber
-          min={0}
-          max={1000}
-          value={record.weight}
+          min={0} max={1000} value={record.weight}
           onChange={(val) => {
             const v = val || 0
             setNodes((prev) => prev.map((n) => (n.id === record.id ? { ...n, weight: v } : n)))
             updateWeight(record.id, v)
           }}
-          size="small"
-          style={{ width: 90 }}
+          size="small" style={{ width: 80 }}
+          disabled={record.is_origin}
         />
       ),
     },
     {
-      title: 'Enabled', dataIndex: 'enabled', key: 'enabled', width: 80,
+      title: 'Enabled', dataIndex: 'enabled', key: 'enabled', width: 70,
       render: (_: any, record: NodeInfo) => (
         <Switch
-          checked={record.enabled}
-          onChange={(val) => toggleNode(record.id, val)}
-          size="small"
+          checked={record.enabled} onChange={(val) => toggleNode(record.id, val)}
+          size="small" disabled={record.is_origin}
         />
       ),
     },
-    {
-      title: 'Health', key: 'health', width: 100,
-      render: () => <Tag icon={<CheckCircleOutlined />} color="success">Online</Tag>,
-    },
   ]
 
   return (
@@ -110,26 +153,26 @@ export default function NodeManager() {
 
       {strategy && (
         <Row gutter={[24, 24]} style={{ marginBottom: 24 }}>
-          <Col xs={24} sm={8}>
+          <Col xs={24} sm={6}>
             <Card style={{ borderRadius: 12 }}>
-              <Statistic
-                title="Strategy"
-                value={strategyLabels[strategy.strategy] || strategy.strategy}
-              />
+              <Statistic title="Strategy" value={strategyLabels[strategy.strategy] || strategy.strategy} />
             </Card>
           </Col>
-          <Col xs={24} sm={8}>
+          <Col xs={24} sm={6}>
             <Card style={{ borderRadius: 12 }}>
-              <Statistic
-                title="Multicast"
-                value={strategy.multicast_available ? 'Available' : 'N/A'}
-                valueStyle={{ color: strategy.multicast_available ? '#2E7D32' : '#999' }}
-              />
+              <Statistic title="Multicast" value={strategy.multicast_available ? 'Available' : 'N/A'}
+                valueStyle={{ color: strategy.multicast_available ? '#2E7D32' : '#999' }} />
             </Card>
           </Col>
-          <Col xs={24} sm={8}>
+          <Col xs={24} sm={6}>
             <Card style={{ borderRadius: 12 }}>
-              <Statistic title="Nodes" value={nodes.length} />
+              <Statistic title="Total Nodes" value={nodes.length} />
+            </Card>
+          </Col>
+          <Col xs={24} sm={6}>
+            <Card style={{ borderRadius: 12 }}>
+              <Statistic title="Online" value={onlineNodes}
+                valueStyle={{ color: onlineNodes > 0 ? '#2E7D32' : '#C62828' }} />
             </Card>
           </Col>
         </Row>
@@ -146,7 +189,8 @@ export default function NodeManager() {
           rowKey="id"
           loading={loading}
           pagination={false}
-          size="middle"
+          size="small"
+          scroll={{ x: 1100 }}
         />
       </Card>
     </div>
diff --git a/frontend/src/admin/pages/Settings.tsx b/frontend/src/admin/pages/Settings.tsx
index 59d1d46..bad1953 100644
--- a/frontend/src/admin/pages/Settings.tsx
+++ b/frontend/src/admin/pages/Settings.tsx
@@ -7,8 +7,9 @@ import api from '../../api/client'
 const { Title } = Typography
 
 const strategies = [
-  { value: 'round-robin', label: 'Round-Robin' },
+  { value: 'subnet', label: 'Subnet-Aware (Recommended)' },
   { value: 'weighted', label: 'Weighted' },
+  { value: 'round-robin', label: 'Round-Robin' },
   { value: 'least-conn', label: 'Least Connections' },
 ]