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In most cases, especially on a small business or home network, you know what your network speed is and the autodetect functionality is unnecessary. It’s not as common but the detection algorithm can also be affected by the actual data going across the wire, or electrical noise. The detection mechanisms can actually conflict with each other and cause one side to get it wrong. The most common auto-detect confusion happens when the devices at both ends of a network connection are trying to auto-detect at the same time. And that can look like anything from really poor network performance to a previously working network connection suddenly dropping. That means that if the device is going to make a mistake it could happen at any time. Most will also monitor the speed continuously just in case it changes. Just how the network devices tell the difference varies from one device to the next. Most home and office networks run at either 10 or 100 megabits per second (mbs). Most contemporary network cards, hubs, and routers attempt to automatically determine the speed of each network connection. Motherboard: ASUSTeK Computer INC.There are many possible reasons so I’ll focus a common one: confused network auto-speed detection. Graphics Card: Intel(R) HD Graphics 3000, -1028 Mb

Processor: Intel(R) Core(TM) i7-2600K CPU 3.40GHz, Intel64 Family 6 Model 42 Stepping 7 OS Version: Microsoft Windows 7 Ultimate, Service Pack 1, 64 bit Tech Support Guy System Info Utility version 1.0.0.4 I have a good knowledge of windows, but not of networks. "Allow other network users to connect through this computer's internet connection" is unchecked. The same for VirtualBox host-only network. In the host: Start > Settings > Network connections, there are 3 items:ĭSL connection, Local area connection, VirtualBox host-only network.Īlso in the host: Local area connection properties, VirtualBox NDIS6 bridged networking driver is checked. Rebooting the guest is useless, must reboot the host. The problem: when the host goes to sleep (and wakes up), the network connections and the internet are lost for the guest, but ok for the others. The two physical computers are attached to a router. Network is ok between the guest, the host and second physical computer (win 10). VirtualBox guest XP sp2 in host Windows 7, attached to Bridged adapter.