別のサブネット上の IP カメラに簡単にアクセスする方法 (窓 & Linux)

When your PC and IP camera are on different subnets, you won’t be able to connect to the camera’s web interface. This is a common issue when setting up surveillance or wireless transmission systems. Fortunately, you can solve it quickly with a few simple network adjustments.

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Why You Can’t Access the Camera

Let’s look at a typical case:

• PC IP: 192.168.10.85 → Network: 192.168.10.0/24
• Camera IP: 192.168.2.254 → Network: 192.168.2.0/24

These two devices are on different network segments (subnets).
Without a router or proper configuration, your PC simply doesn’t know where to send packets destined for 192.168.2.x.

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解決 1: Change the PC IP to Match the Camera’s Subnet

これは、 quickest and easiest 方法, suitable when your computer is directly connected to the camera or connected via a simple switch.

窓

1. 開ける ネットワーク & Internet Settings → Ethernet → Change adapter options.
2. Right-click your network adapter → Properties → Internet Protocol Version 4 (TCP/IPv4) → Properties.
3. Set the following: IP address: 192.168.2.100 Subnet mask: 255.255.255.0 Default gateway: leave blank
4. クリック わかりました, then open your browser and go to http://192.168.2.254.

💡 After configuration, don’t forget to change your IP back to its original address (例えば, 192.168.10.85) to restore normal internet access.

Linux

1. Find your network interface: ip a (Example: eth0, enp3s0, ens33)
2. Assign a temporary IP: sudo ip addr flush dev eth0 sudo ip addr add 192.168.2.100/24 dev eth0 sudo ip link set eth0 up
3. 訪問 http://192.168.2.254 in your browser.
4. When done, revert to your original IP: sudo ip addr flush dev eth0 sudo ip addr add 192.168.10.85/24 dev eth0 sudo ip link set eth0 up

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解決 2: Add a Secondary IP (Keep Internet Access)

If your PC must stay connected to the internet or another network, あなたはできる add a second IP address instead of changing the main one.

窓

1. に行く Ethernet → Properties → IPv4 → Advanced.
2. クリック Add under “IP addresses” and enter: IP address: 192.168.2.100 Subnet mask: 255.255.255.0
3. クリック わかりました.
4. Now your PC has both:
   • 192.168.10.85 (for the main network)
   • 192.168.2.100 (for the camera)

Linux

1. Add the second IP: sudo ip addr add 192.168.2.100/24 dev eth0
2. Confirm: ip a show dev eth0 You should see both IPs listed.
3. Access the camera via: http://192.168.2.254

This setup is temporary. After reboot, you can repeat the command or make it permanent using your system’s network configuration tool.

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解決 3: Use a Router or Static Route (For Larger Networks)

If your PC and camera are connected through different routers or VLANs, you’ll need routing between the two subnets.

On the main router (for example, 192.168.10.1), add a static route:

Destination network: 192.168.2.0
Subnet mask: 255.255.255.0
Next hop: 192.168.10.x  (device that connects to the 192.168.2.x network)

Once routing is active, both devices will be able to communicate normally.

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Troubleshooting Checklist

If you still can’t access the camera:

• Check the network cable そして camera’s link lights.
• Ensure your firewall isn’t blocking local connections.
• 試す pinging the camera: ping 192.168.2.254
• Confirm the camera’s IP address using the manufacturer’s search/config tool.
• Restart your network interface or router after changes.

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結論

When your PC and IP camera are on different subnets, they can’t communicate directly — but you have multiple easy solutions:

• Temporarily change your PC’s IP
• Add a secondary IP for dual access
• Configure routing for multi-network setups

Once both devices share a compatible network segment, you’ll be able to log in to your IP camera’s web interface and begin streaming, 録音, or configuring it right away.