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