在前述的私有鏈操作，描述的是單一節點的運作，在以太坊的主要網路中有多個節點彼此連結，並且同步更新最新的狀態，在私有鏈網路中加入其他節點，觀察這種同步情形。
－在第一個節點的控制台，使用net.listening 和 net.peerCount 來觀察單個節點的狀態 :

>net.peerCount  <= 回傳連接節點個數
0

>net.listening   <= 回傳是否監聽節點
true

－開啟第二個Terminal，創造第二個節點，使用genesis.json檔案再開啟一個私有鏈，放在不同的資料夾。
genesis.json檔案範例 :

{
 "config": {
"chainId":20,
"homesteadBlock":0,
"eip155Block":0,
"eip158Block":0},
"alloc" :{
"0xa3754f5b8277b6733ce633f52b5ff229bec012de":{"balance":"10000000000000000000000"}},
"coinbase" :"0x0000000000000000000000000000000000000000",
"difficulty" :"0x01",
"extradata" :"0x12",
"gasLimit" :"0xffffffff",
"parentHash":"0x0000000000000000000000000000000000000000000000000000000000000000",
"timestamp" :"0x00"
}

－將genesis.json初始化

geth  --datadir "./node2" init genesis.json

參考前述文章，在node2資料夾，產生geth資料夾和Keystore資料夾，開啟節點 :

geth --datadir "./node2" --rpc --rpcaddr=0.0.0.0 --rpcport (自訂,不能跟第一個節點設置相同的值) --rpcapi "eth,web3,personal,admin,net" --port (自訂,不能跟第一個節點設置相同的值) --nodiscover(關閉自動連接節點) console 

INFO [10-23|18:56:50.073] Maximum peer count                       ETH=25 LES=0 total=25
INFO [10-23|18:56:50.074] Starting peer-to-peer node               instance=Geth/v1.8.18-unstable-88b41a9e/linux-amd64/go1.10.4
INFO [10-23|18:56:50.074] Allocated cache and file handles         database=/home/name/Iron/node2/geth/chaindata cache=768 handles=512
INFO [10-23|18:56:50.266] Initialised chain configuration          config="{ChainID: 20 Homestead: 0 DAO: <nil> DAOSupport: false EIP150: <nil> EIP155: 0 EIP158: 0 Byzantium: <nil> Constantinople: <nil> Engine: unknown}"
INFO [10-23|18:56:50.266] Disk storage enabled for ethash caches   dir=/home/name/Iron/node2/geth/ethash count=3
INFO [10-23|18:56:50.266] Disk storage enabled for ethash DAGs     dir=/home/name/.ethash                count=2
INFO [10-23|18:56:50.266] Initialising Ethereum protocol           versions="[63 62]" network=1
INFO [10-23|18:56:50.267] Loaded most recent local header          number=12 hash=6b2e8f…ed23c0 td=1575745 age=1d20h1m
INFO [10-23|18:56:50.267] Loaded most recent local full block      number=12 hash=6b2e8f…ed23c0 td=1575745 age=1d20h1m
INFO [10-23|18:56:50.267] Loaded most recent local fast block      number=12 hash=6b2e8f…ed23c0 td=1575745 age=1d20h1m
INFO [10-23|18:56:50.267] Loaded local transaction journal         transactions=0 dropped=0
INFO [10-23|18:56:50.267] Regenerated local transaction journal    transactions=0 accounts=0
WARN [10-23|18:56:50.267] Blockchain not empty, fast sync disabled 
INFO [10-23|18:56:50.494] New local node record                    seq=8 id=6e6b9a2d129850ee ip=127.0.0.1 udp=0 tcp=30305
INFO [10-23|18:56:50.494] Started P2P networking                   self="enode://8603b8f21f6c7888f2bcd1030a83935c63bff9e60da41609777ebfc9790496a0cdf16668e6a064d6d20a2e49abdd3dee4de925a2661f5527b0f03eb95d43df89@127.0.0.1:30305?discport=0"
INFO [10-23|18:56:50.495] IPC endpoint opened                      url=/home/name /Iron/node2/geth.ipc
INFO [10-23|18:56:50.496] HTTP endpoint opened                     url=http://0.0.0.0:8540           cors= vhosts=localhost
Welcome to the Geth JavaScript console!

instance: Geth/v1.8.18-unstable-88b41a9e/linux-amd64/go1.10.4
 modules: admin:1.0 debug:1.0 eth:1.0 ethash:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 web3:1.0    <= 註記ChainId必須相同才能進行節點連接。

－輸入net.listening 和 net.peerCount :

> net.listening    <= 確認監聽節點的狀態
true

>net.peerCount    <= 確認連接節點的數量  
0

－輸入 : admin.nodeInfo <= 查詢節點資訊

> admin.nodeInfo
{
  enode: "enode://8603b8f21f6c7888f2bcd1030a83935c63bff9e60da41609777ebfc9790496a0cdf16668e6a064d6d20a2e49abdd3dee4de925a2661f5527b0f03eb95d43df89@127.0.0.1:30305?discport=0",
  enr: "0xf895b840326b513f4ebd5bc4aa8bdc9e02b2fd2c08ffac757da589b96ca173ca9edba706713813493043a4f0246464b71e730a829d56ac1ff6a90b9c6ff115fd070a30260883636170ccc5836574683ec5836574683f826964827634826970847f00000189736563703235366b31a1038603b8f21f6c7888f2bcd1030a83935c63bff9e60da41609777ebfc9790496a083746370827661",
  id: "6e6b9a2d129850ee0353d9872212c5120f02a2d7e3a02871f3f6d92c6e9dfa95",
  ip: "127.0.0.1",
  listenAddr: "[::]:30305",
  name: "Geth/v1.8.18-unstable-88b41a9e/linux-amd64/go1.10.4",
  ports: {
    discovery: 0,
    listener: 30305
  },
  protocols: {
    eth: {
      config: {
        chainId: 20,
        eip150Hash: "0x0000000000000000000000000000000000000000000000000000000000000000",
        eip155Block: 0,
        eip158Block: 0,
        homesteadBlock: 0
      },
      difficulty: 1575745,
      genesis: "0x68eb29f76a6d60413df91e17a3ec53a41208e9f08907f2a6d4a3e36ec9695376",
      head: "0x6b2e8fd8e70880706a743a27253fbc7774a96b052193d81c2f6c1c6070ed23c0",
      network: 1
    }
  }
}         <=  enode為節點資訊。

－回到第一個節點的控制台。
輸入 :

>admin.addPeer("enode://8603b8f21f6c7888f2bcd1030a83935c63bff9e60da41609777ebfc9790496a0cdf16668e6a064d6d20a2e49abdd3dee4de925a2661f5527b0f03eb95d43df89@127.0.0.1:30305?discport=0")  < =參數是第二個節點的節點資訊。
>true   <= 連結成功

－查看已連接的節點。
輸入 admin.peers :

> admin.peers
[{
    caps: ["eth/62", "eth/63"],
    enode: "enode://8603b8f21f6c7888f2bcd1030a83935c63bff9e60da41609777ebfc9790496a0cdf16668e6a064d6d20a2e49abdd3dee4de925a2661f5527b0f03eb95d43df89@127.0.0.1:30305?discport=0",
    id: "6e6b9a2d129850ee0353d9872212c5120f02a2d7e3a02871f3f6d92c6e9dfa95",
    name: "Geth/v1.8.18-unstable-88b41a9e/linux-amd64/go1.10.4",
    network: {
      inbound: false,
      localAddress: "127.0.0.1:60290",
      remoteAddress: "127.0.0.1:30305",
      static: true,
      trusted: false
    },
    protocols: {
      eth: {
        difficulty: 1575745,
        head: "0x6b2e8fd8e70880706a743a27253fbc7774a96b052193d81c2f6c1c6070ed23c0",
        version: 63
      }
    }
}] 

連接成功。