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bellard 2004-04-26 20:55:38 +00:00
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qemu-doc.texi
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@ -548,7 +548,55 @@ Since holes are used, the displayed size of the COW disk image is not
the real one. To know it, use the @code{ls -ls} command.
@end enumerate
@section Direct Linux Boot and Network emulation
@section Network emulation
QEMU simulates up to 6 networks cards (NE2000 boards). Each card can
be connected to a specific host network interface.
@subsection Using tun/tap network interface
This is the standard way to emulate network. QEMU adds a virtual
network device on your host (called @code{tun0}), and you can then
configure it as if it was a real ethernet card.
As an example, you can download the @file{linux-test-xxx.tar.gz}
archive and copy the script @file{qemu-ifup} in @file{/etc} and
configure properly @code{sudo} so that the command @code{ifconfig}
contained in @file{qemu-ifup} can be executed as root. You must verify
that your host kernel supports the TUN/TAP network interfaces: the
device @file{/dev/net/tun} must be present.
See @ref{direct_linux_boot} to have an example of network use with a
Linux distribution.
@subsection Using the user mode network stack
This is @emph{experimental} (version 0.5.4). You must configure qemu
with @code{--enable-slirp}. Then by using the option
@option{-user-net} or if you have no tun/tap init script, QEMU uses a
completely user mode network stack (you don't need root priviledge to
use the virtual network). The virtual network configuration is the
following:
@example
QEMU Virtual Machine <------> Firewall/DHCP server <-----> Internet
(10.0.2.x) | (10.0.2.2)
|
----> DNS
(10.0.2.3)
@end example
The QEMU VM behaves as if it was behind a firewall which blocks all
incoming connections. You can use a DHCP client to automatically
configure the network in the QEMU VM.
In order to check that the user mode network is working, you can ping
the address 10.0.2.2 and verify that you got an address in the range
10.0.2.x from the QEMU virtual DHCP server.
@node direct_linux_boot
@section Direct Linux Boot
This section explains how to launch a Linux kernel inside QEMU without
having to make a full bootable image. It is very useful for fast Linux