Sun Microsystems 3.0.0 Manual De Usuario
6 Virtual networking
VirtualBox has limited support for so-called jumbo frames, i.e. networking packets
with more than 1500 bytes of data, provided that you use the Intel card virtualiza-
tion and bridged networking. In other words, jumbo frames are not supported in NAT
mode or with the AMD networking devices; in those cases, jumbo packets will silently
be dropped for both the transmit and the receive direction. Guest operating systems
trying to use this feature will observe this as a packet loss, which may lead to unex-
pected application behavior in the guest. This does not cause problems with guest
operating systems in their default configuration, as jumbo frames need to be explicitly
enabled.
tion and bridged networking. In other words, jumbo frames are not supported in NAT
mode or with the AMD networking devices; in those cases, jumbo packets will silently
be dropped for both the transmit and the receive direction. Guest operating systems
trying to use this feature will observe this as a packet loss, which may lead to unex-
pected application behavior in the guest. This does not cause problems with guest
operating systems in their default configuration, as jumbo frames need to be explicitly
enabled.
6.2 Introduction to networking modes
Each of the eight networking adapters can be separately configured to operate in one
of the following five modes:
of the following five modes:
• Not attached
• Network Address Translation (NAT)
• Bridged networking
• Internal networking
• Host-only networking
By default, virtual network cards are set up to use network address translation, which
is well suited to standard networking needs (accessing the Internet from programs
running in the guest and providing network services for machines in a local intranet).
In particular, if all you want is to browse the Web, download files and view e-mail
inside the guest, then the default configuration of the NAT network should be sufficient
for you, and you can safely skip the rest of this section. Please note that the ping
utility does not work over NAT, and that there are certain limitations when using
Windows file sharing (see chapter
running in the guest and providing network services for machines in a local intranet).
In particular, if all you want is to browse the Web, download files and view e-mail
inside the guest, then the default configuration of the NAT network should be sufficient
for you, and you can safely skip the rest of this section. Please note that the ping
utility does not work over NAT, and that there are certain limitations when using
Windows file sharing (see chapter
, page
for details).
For advanced networking needs such as network simulations, bridged networking
can be used to set up an additional, software based network interface on the host to
which the virtual machine is connected.
which the virtual machine is connected.
VirtualBox internal networking can be used to create a virtual network which is
visible to selected virtual machines, but not to applications running on the host or to
the outside world.
the outside world.
Finally, host-only networking can be used to create a network containing the host and
a set of virtual machines, without the need for the host’s physical network interface.
Instead, a virtual network interface (similar to a loopback interface) is created on the
host, providing connectivity among virtual machines and the host.
Instead, a virtual network interface (similar to a loopback interface) is created on the
host, providing connectivity among virtual machines and the host.
The following sections describe the available network modes in more detail.
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