![]() ![]() You can also check whether a DHCP client obtains the IP address correctly, whether the appropriate application can resume downloading after link interruption or packet loss, and so on. When you disable the Not Attached mode by switching to another network mode, the network connection becomes available again. For example, you can enable this network mode for a short time to emulate unplugging the cable. Not attachedĪ virtual network adapter is installed in a VM, but the network connection is missing, much like when you unplug the Ethernet network cable when using a physical network adapter. Let’s consider each VirtualBox network mode in detail. You can select the network mode in the Attached to drop-down menu. For example, you can set the NAT mode for the adapter 1 and the Host-only mode for the adapter 2. Each virtual network adapter can be separately configured to operate in a different network mode. VirtualBox provides a long list of network modes, which is one of the most interesting features of VirtualBox network settings. If you try to enable jumbo frames for AMD-based virtual network adapters, jumbo frames will be dropped silently for input and output traffic. AMD-based virtual networks adapters don’t support jumbo frames. If you need to use jumbo frames, select an Intel virtualized network adapter, and configure that adapter to work in bridged mode. VirtualBox provides limited support for jumbo frames (Ethernet frames that can carry packets which size is more than 1,500 bytes). These drivers are available for Linux with kernel 2.6.25 or later, and Windows including older versions such as Windows 2000, XP and Vista. VirtIO networking drivers are a part of the KVM project and are open-source. The industry standard virtIO networking drivers are supported by VirtualBox. This approach allows you to avoid the complexity of networking hardware emulating and, as a result, can improve network performance. Instead of virtualizing networking hardware that is supported by most operating systems, a guest operating system must provide a special software interface for virtualized environments.
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