![]() ![]() Powering down the VM and restarting it does not work.Changing to a different bridged adapter (such as wireless) or a NAT adapter and then back to the original bridged adapter is enough to restore connectivity.VirtualBox Version: 5.0.X (don't remember when first observed) - 5.1.6Ībout a year ago, me and my colleagues started noticing a problem where a bridged network connection would work fine when a VM was started but unplugging the network cable and plugging it back in would result in VirtualBox never resuming the network connection on the guest. ![]() I'm experiencing similar problems on Windows 10 host. It's just when I disconnect the cable to more than 5 seconds and plug it back in, the pings do not pick back up. Note: If I put the PC to sleep (tested up to 5 mins) and wake it back up, pings pick back up. I've tried the various "Adapter Types" in VirtualBox to no avail. Restarting the guest Linux networking, a VM reboot, or a disable/enable of all Windows' interfaces does not regain network connectivity to the Linux VM. If it takes more than 5 seconds for me to plug the cable back in, the ping does not pick back up and I need to shut down the VM and cold boot it in order to restore networking between the VM and LAN. If I start a ping from within the Linux VM and disconnect the Ethernet cable from the bridged interface (Intel Ethernet Connection I219-LM) and plug it back in within 5 seconds, the ping picks back up where it left off. The VM can communicate with my LAN and vice versa. Networking functions 100% between the VM and LAN if I power on the VM with the Ethernet cable plugged in to the bridged interface (Intel Ethernet Connection I219-LM). 2 = Bridged Adapter (Intel Ethernet Connection I219-LM).1 = Host-only Adapter ( VirtualBox Host-Only Ethernet Adapter).See the Virtualbox manual, section 6, for more info and some other network styles.Host = Windows 10 Version 1151 (Build 10586.164) ![]() (I don't know if access to the guest network is possible when the host network card is unplugged on this setup.) Internet to the guests would be available when the host has it, but the guests would be behind a "router", so port-forwarding from the host would be necessary. It may also be possible to connect all your guests to a NAT network, so they guests can all communicate, and the host can get into the guests' network via port-forwarding in the NAT network. If you also want the guests to have internet access when the host PC is network-connected, add another network card connected to NAT to each guest needing internet. There is no Internet or LAN access out of the PC on Host-Only. This is a private network between all guests connected to it and the host PC. If it is essential that the guests stay connected to the host PC while there is no network, you can use Host-Only. Take the network away, and your guests and PC are left not knowing what to connect to. Bridged acts like there's a virtual unmanaged switch between your PC guts and the network card, so your PC and the guests all can access whatever network is there on the other side of the jack on the back of the PC. If I recall correctly, Bridged depends on having a live network connection to work. ![]()
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