id summary reporter owner description type status component version resolution keywords cc guest host 12148 VirtualBox NAT on Ubuntu 13.04 intermittently broken Jeremy McMillan "Guest can typically ARP, DHCP, but after that ARP resolution fails, ergo networking stops (unable to ping default gateway). Without intervention, it will start working again, and then intermittently stop working. This affects both Oracle and Ubuntu provided VirtualBox 4.2.x versions since 14. NIC trace pcaps show guest packets transmitting ARP, but not getting any response from the virtual NAT gateway. Then for unknown reasons it starts working for a while. See https://forums.virtualbox.org/viewtopic.php?f=7&t=56962" defect closed network/NAT VirtualBox 4.2.16 fixed Windows Linux