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net: Get rid of 'vlan' terminology and use 'hub' instead in the doc files 

'vlan' is very confusing since it does not mean something like IEEE
802.1Q, but rather emulated hubs, so let's switch to that terminology
instead. While we're at it, move the subsection about hub a little bit
downward in the documentation (it's not as important anymore as it was
before the invention of the -netdev parameter), and extend it a little
bit.

Buglink: https://bugs.launchpad.net/qemu/+bug/658904
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Thomas Huth 2018-04-30 20:02:25 +02:00 committed by Jason Wang
parent 442da403ea
commit 0e0266c2e4
1 changed files with 23 additions and 19 deletions
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42
qemu-doc.texi
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@ -714,20 +714,12 @@ state is not saved or restored properly (in particular USB).
@node pcsys_network
@section Network emulation
QEMU can simulate several network cards (PCI or ISA cards on the PC
target) and can connect them to an arbitrary number of Virtual Local
Area Networks (VLANs). Host TAP devices can be connected to any QEMU
VLAN. VLAN can be connected between separate instances of QEMU to
simulate large networks. For simpler usage, a non privileged user mode
network stack can replace the TAP device to have a basic network
connection.
@subsection VLANs
QEMU simulates several VLANs. A VLAN can be symbolised as a virtual
connection between several network devices. These devices can be for
example QEMU virtual Ethernet cards or virtual Host ethernet devices
(TAP devices).
QEMU can simulate several network cards (e.g. PCI or ISA cards on the PC
target) and can connect them to a network backend on the host or an emulated
hub. The various host network backends can either be used to connect the NIC of
the guest to a real network (e.g. by using a TAP devices or the non-privileged
user mode network stack), or to other guest instances running in another QEMU
process (e.g. by using the socket host network backend).
@subsection Using TAP network interfaces
@ -763,7 +755,7 @@ network). The virtual network configuration is the following:
@example
QEMU VLAN <------> Firewall/DHCP server <-----> Internet
guest (10.0.2.15) <------> Firewall/DHCP server <-----> Internet
| (10.0.2.2)
|
----> DNS server (10.0.2.3)
@ -798,11 +790,23 @@ When using the @option{'-netdev user,hostfwd=...'} option, TCP or UDP
connections can be redirected from the host to the guest. It allows for
example to redirect X11, telnet or SSH connections.
@subsection Connecting VLANs between QEMU instances
@subsection Hubs
Using the @option{-net socket} option, it is possible to make VLANs
that span several QEMU instances. See @ref{sec_invocation} to have a
basic example.
QEMU can simulate several hubs. A hub can be thought of as a virtual connection
between several network devices. These devices can be for example QEMU virtual
ethernet cards or virtual Host ethernet devices (TAP devices). You can connect
guest NICs or host network backends to such a hub using the @option{-netdev
hubport} or @option{-nic hubport} options. The legacy @option{-net} option
also connects the given device to the emulated hub with ID 0 (i.e. the default
hub) unless you specify a netdev with @option{-net nic,netdev=xxx} here.
@subsection Connecting emulated networks between QEMU instances
Using the @option{-netdev socket} (or @option{-nic socket} or
@option{-net socket}) option, it is possible to create emulated
networks that span several QEMU instances.
See the description of the @option{-netdev socket} option in the
@ref{sec_invocation,,Invocation chapter} to have a basic example.
@node pcsys_other_devs
@section Other Devices