- Openvpnusers Tun Tap Driver For Mac Catalina
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If you use linux (optionally FreeBSD and Solaris, not tested),you may want to access the network through a tuntap interface. The mainadvantage of this interface, is that the guest has access to the host. The guest can evenhave access to the whole network if the host routes or masquerades the guest requests.No extra IP address is needed, all can be done using private IP addresses.
You'll find here instructions to set up Linux/Bochs to provide network access to the guest OSthrough a tuntap interface and private IP network. We're going to see howto :
- enable the tuntap interface in the Linux Kernel
- configure Bochs to use the tuntap interface
- set up the private network between the host and the guest
- set up the host to masquerade the guest network accesses
The first step is to create the Tun/tap driver to start the connection and in Windows, I would use the tapinstall executable file to do this. I am trying to find a way how to do it for Linux but unfortunately, I am unable to find anything so far. Can anyone provide any insight on how to create a Tap/Tun driver in a Linux environment? TUN and TAP are virtual networking devices which allow userland applications to receive packets sent to it. The userland applications can also send their own packets to the devices and they will be forwarded to the kernel. I have been using the tap-win32 driver with multicast in TUN mode. In its current version the tap-win32 driver blocks multicast packets in AdapterTransmit as it only allows unicast packets. I have written a patch for the driver to allow multicast packets through the driver which works for me which I wanted to share (although IGMPv2 doesn't seem.
8.11.1. Tuntap descriptionFrom the tuntap.txt file in the Linux kernel tree :
8.11.2. Set up the linux Kernel [1]First make sure the tuntap module is included in the kernel :
- if you use a recent distribution, chances are that the needed modules are already buildMake sure that 'Kernel module loader' - module auto-loading support is enabled in your kernel.Add following line to the /etc/modules.conf:Run: The driver will be automatically loaded when application access /dev/net/tun.
- Otherwise, recompile the kernel, including the configuration option
Note: Make sure there is a /dev/net/tun device.(Can be created with 'mkdir /dev/net ; mknod /dev/net/tun c 10 200').
In the same way, to use masquerading, you need a kernel with the following options :
Note: Some of the other options in this group is probably also needed,(but the default setting should be OK).
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8.11.3. Configure Bochs to use the tuntap interfaceMake sure Bochs has one of the network adapters enabled. If you have to recompile Bochs, use --enable-ne2000 or --enable-e1000 when running ./configure (see Section 3.4)
edit your .bochsrc configuration file and add something like :
Since the tuntap interface cannot be configured until a process opens it, Bochs may run a script file for you. In this case /path/to/tunconfig should be changed to match the actual place where you'll create this script.
8.11.4. Set up the private network between the host and the guest We'll set up a private network between the host and the guest with the following parameters: If your parameters are different, adapt the rest of the section to suit your needs.
Create the /path/to/tunconfig script : The script get the interface name as the first parameter. Linux will forward incoming packets between interfaces.
Make it executable :
Run Bochs, install the guest OS, and set the following network parameters in the guest OS:
Note: Bochs must be started by root (at least for now - the script won't have root privileges otherwise).
You may also have to edit /etc/hosts.allow in the host OS and add : Don't forget to set up the route on the guest. At this point, you should be able to ping/telnet/ftp/ssh the guest from the host and vice-versa.
8.11.5. Set up the host to masquerade the guest network accesses We are going to set up standard masquerading configuration. Edit the /path/to/tunconfig script ans add :
Note: The configuration assumes the default policy is ACCEPT (can be examined by doing '/sbin/iptables -L')
Note: The iptables package must be installed.
And voila.. The host should forward the packets of the guest to the rest of your network. You could even have access to the internet.. Note: You may need to load other modules if you want to use other fancy protocols (ftp,etc..)
NotesOpenvpnusers Tun Tap Driver For Mac Catalina
[1]Openvpnusers Tun Tap Driver For Macbook
much of the information of the following section is taken from this email from Samuel Rydh of the Mac-On-Linux list