Forwarding host ports 1024 impossible: On Unix-based hosts (e.g. There are other VPN products which use simply TCP and UDP. Protocols such as GRE are unsupported: Protocols other than TCP and UDP are not sup- ported. As a workaround, you can use the numeric IP of the desired server in the \\server\share notation. As a consequence, NetBios name resolution based on broadcasts does not always work (but WINS always works).
Receiving of UDP broadcasts is not reliable: The guest does not reliably receive broadcasts, since, in order to save resources, it only listens for a certain amount of time after the guest has sent UDP data on a particular port. While ICMP sup- port has been improved with VirtualBox 2.1 (ping should now work), some other tools may not work reliably. ping or tracerouting) rely on the ICMP protocol for sending/receiving messages. 6.3.3 NAT limitations There are four limitations of NAT mode which users should be aware of: ICMP protocol limitations: Some frequently used network debugging tools (e.g. It is the responsibility of the user to provide vmname.pxe. The NAT DHCP server provides a boot file name of the form vmname.pxe if the directory TFTP exists in the directory where the user’s VirtualBox.xml file is kept. 6.3.2 PXE booting with NAT PXE booting is now supported in NAT mode.
However, you can change the settings for a VM which is currently saved (or powered off at a snapshot). It is not possible to configure incoming NAT connections while the VM is running. To forward all incoming traffic from a specific host interface to the guest, specify the IP of that host interface like this: VBoxManage modifyvm "VM name" -natpf1 "guestssh,tcp,127.0.0.1,2222,22" This forwards all TCP traffic arriving on the localhost interface (127.0.0.1) via port 2222 to port 22 in the guest. 6 Virtual networking VBoxManage modifyvm "VM name" -natpf1 delete "guestssh" If for some reason the guest uses a static assigned IP address not leased from the built-in DHCP server, it is required to specify the guest IP when registering the forwarding rule: VBoxManage modifyvm "VM name" -natpf1 "guestssh,tcp,2222,10.0.2.19,22" This example is identical to the previous one, except that the NAT engine is being told that the guest can be found at the 10.0.2.19 address.
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