id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 6323,Can't get IP Forwarding to work with Host-only adapter,grattemedi,,"Hello, I'm developing a software to demonstrate how Man in the middle works using arp cache poisoning. I can't get ip forwarding to work with Host-only adapter! I was previously using a bridged network on tun/tap devices that I was creating myself. My network was designed like this : [*]1 bridge br0 [*]2 tun/tap interfaces tap0 and tap1 Then I add the tap0 and tap1 to the bridge and configure my 2 VMs to use bridged network on tap0 and tap1. With this configuration, ip-forwading works perfectly fine! My bridge br0 can play the role of the attacker and forward ip between my first and second VM. '''Now I'm trying to use host-only adapter''', so that i could use later in my program the ''VBoxManage hostonly ipconfig'' command line. In the configuration I want to be, my 1st VM wants to talk to my 2nd VM but its arp cache has been corrupted so that packets are sent to the host (host-only interface). My problem is packets aren't forwarded by the host, and they normally should be. I'm enabling ip forwarding on the host-only adapter (vboxnet0), as I was doing before with my bridge br0 : {{{ echo 1 > /proc/sys/net/ipv4/conf/*/forwarding echo 0 > /proc/sys/net/ipv4/conf/*/send_redirects }}} Unfortunately, even though each machine in this configuration can communicate with one another, the vboxnet0 interface doesn't forward ip packets. Shouldn't host only interface behave like a normal networking interface? Thank you, Laurent Sebag",defect,new,network/hostif,VirtualBox 3.0.6,,ip forwarding host only,,Linux,Linux