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<title> [筆記] 在gcp 中用wireguard建立VPN時，不要用 10.0.0.0/16 網段/Do No Use 10 0 0 0 Private Ipaddr in GCP | MCの飄狂山莊㊣</title>
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<h3><a href="/post/do-no-use-10-0-0-0-private-ipaddr-in-gcp/">[筆記] 在gcp 中用wireguard建立VPN時，不要用 10.0.0.0/16 網段/Do No Use 10 0 0 0 Private Ipaddr in GCP</a></h3>
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<span class="date moment">2019-08-16</span>
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<span class="author"><a href="/author/eric-chang">Eric Chang</a></span>
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<p>最近一直在玩 wireguard ，先前把各個分公司和總部的VPN 改用 wireguard 建立</p>
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<p>想說再打個VPN tunnel 來當跳板連 ptt 好了</p>
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<p>因為wireguard 建立很簡單，而且又可以指定想要繞出去的路由，不會影響原本的網路環境</p>
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<p>本來是在vultr 的VPS上面建立這個tunnel</p>
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<p>但是那台VPS連去ptt 很頓，卡卡的</p>
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<p>所以改用google cloud platform 的free tier 來做</p>
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<p>反正只是拿來當跳板，不會有什麼流量、運算產生，可以一直保持免費的狀態</p>
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<p></p>
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<p>GCP的申請、設定就不多說了</p>
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<p>這次碰到的怪異現象是當wireguard 都已經設定好，client 也都連上了之後</p>
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<p>會發生client 開不了 www.google.com.tw / youtube / google map 等等google 服務的狀況</p>
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<p>VPN確定是通的，我可以在client 這邊連上其他網站，但就是google的服務開不了</p>
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<p>後來不知道是怎麼樣，突然靈機一動，因為一開始設定server/peer 都是用 10.0.0.x/24 的IP</p>
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<p>想說會不會是因為這個也是google cloud platform 預設的LAN IP 網段，所以沒辦法繞出去</p>
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<p>看一下設定，確認一下這個想法對不對，果然是這樣沒錯</p>
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<p><img src="https://i.imgur.com/XkrH4Pa.png" alt="" /></p>
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<p>解決方法很簡單，要不修改VPS的內部IP，要不修改wireguard的設定</p>
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<p>當然我是選擇改wireguard ，因為簡單嘛！</p>
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<p>修改後的configuration 長這樣</p>
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<pre><code>[Interface]
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Address = 192.168.10.1/24
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PostUp = iptables -A FORWARD -i wg0 -j ACCEPT; iptables -A FORWARD -o wg0 -j ACCEPT; iptables -t nat -A POSTROUTING -o ens4 -j MASQUERADE
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PostDown = iptables -D FORWARD -i wg0 -j ACCEPT; iptables -D FORWARD -o wg0 -j ACCEPT; iptables -t nat -D POSTROUTING -o ens4 -j MASQUERADE
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ListenPort = 12000
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PrivateKey = E..........................E
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#OFFICE DESKTOP
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[Peer]
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PublicKey = W...........................W
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AllowedIPs = 192.168.10.2/32
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#ANDROID
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[Peer]
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PublicKey = w............................w
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AllowedIPs = 192.168.10.3/32
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#HOME
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[Peer]
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PublicKey = 2.........................................2
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AllowedIPs = 192.168.10.4/32
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</code></pre>
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<p>重起wireguard (或者說重起 wg0 這個interface)之後，client 開google 網頁就正常了</p>
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<p>client 這邊，也是簡單設定一下，把要透過跳板出去的IP 改走wireguard 出去</p>
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<p>底下這個，就是把往台大(140.112.0.0) 和 term.ptt.cc(104.31.0.0)的封包改走wireguard</p>
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<pre><code>[Interface]
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PrivateKey = e............................e
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Address = 192.168.10.2/24
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DNS = 8.8.8.8
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MTU = 1420
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[Peer]
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PublicKey = q...........................q
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Endpoint = public_ip_of_gcp:12000
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AllowedIPs = 140.112.0.0/16,104.31.0.0/16,192.168.10.1/32
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PersistentKeepalive = 25
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</code></pre>
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<p>然後看一下路由對不對</p>
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<pre><code>2019-08-16 10:34:21 [cch@hq34 ~]$ traceroute term.ptt.cc
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traceroute to term.ptt.cc (104.31.231.9), 30 hops max, 60 byte packets
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1 192.168.10.1 (192.168.10.1) 191.826 ms 192.556 ms 192.678 ms
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2 * * *
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3 * * *
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4 * * *
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5 104.31.231.9 (104.31.231.9) 203.918 ms 203.982 ms 203.979 ms
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2019-08-16 10:34:33 [cch@hq34 ~]$
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</code></pre>
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<p>果然是走wireguard (192.168.10.1) 出去 ，跳板成功！</p>
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©
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2017
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by Lednerb
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<a href="https://www.yapee.tw/mvc/onlinePay/webLink?key=lMC74kucH21JChCR77-wJ80ZZ-Poh11amP24BwiDdHw" target="_blank">Bilberry Hugo Theme</a>
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