id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 16923,host only networking (hostonlyif) broken,LennyHers,,"We have just upgrade all our VM hosts to 5.1.24r117012 which obviously broke the whole vm networking across 300 VMs (hostonlyifs). It is not possible to ping the hostonly interface from the guest and the host system shows that all packets to the interface are being dropped. $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.2 LTS Release: 16.04 Codename: xenial $ uname -a Linux mars 4.4.0-83-generic #106-Ubuntu SMP Mon Jun 26 17:54:43 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux $ vboxmanage --version 5.1.24r117012 VBoxManage hostonlyif create VBoxManage hostonlyif ipconfig vboxnet0 --ip 192.168.56.1 VBoxManage dhcpserver add --ifname vboxnet0 --ip 192.168.56.10 --netmask 255.255.255.0 --lowerip 192.168.56.200 --upperip VBoxManage dhcpserver modify --ifname vboxnet0 --enable $ sudo ifconfig vboxnet0 vboxnet0 Link encap:Ethernet HWaddr 0a:00:27:00:00:00 inet addr:192.168.56.1 Bcast:0.0.0.0 Mask:255.255.255.0 BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:403 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Note: Please consider the ""dropped"" count. All packets are being dropped. ",defect,closed,network/hostif,VirtualBox 5.1.22,duplicate,,,other,other