virtual network with qemu
nvass9573 at gmx.com
Thu May 14 08:29:23 UTC 2009
marco.borsatino at poste.it wrote:
> When the installation program asked for information about network configuration, as a
> first step, I chose DHCP configuration and, as usualy, the network has been set
> like this:
> IP 10.0.2.15/255.255.255.0
If I recall correctly qemu has a built-in DHCP server.
That's the one that served you, not a "real" DHCP server
running on your LAN, that is, you are not in any way connected
to the "real" network.
> #qemu -L /usr/local/share/qemu -localtime -net nic,macaddr=00:15:f2:44:2d:01 -net socket,mcast=18.104.22.168:1234 -hda pc01.img -cdrom /dev/acd0 &
> but the network in the guest system does not work.
It makes sense, that the multicast option will work
between virtual hosts only. That is, it uses multicast
to provide a virtual broadcast domain, which appears to
the host operating system as a ethernet device.
> ifconfig in the guest system tells:
> #ifconfig -a
> ed0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> ether 00:15:f2:44:2d:01
> media: Ethernet 10baseT/UTP <full-duplex>
> plip0: ...
> lo0: ...
> If I try:
> #ping 10.0.2.2 (the gateway)
> all packets are lost. For this reason, I've tryed a static IP configuration like this:
> IP 10.0.2.4/255.255.255.0
> gateway 10.0.2.2
> nameserver 10.0.2.3
> but the gateway does not respond. So it is useless to try with a second guest system.
No, infact it's the exact opposite. This type of device
will work *only* if you add another virtual system.
To get connected to the "real" network, you must use tap
Browsing the qemu's wiki I found out that there is a newer
and simpler approach that I am not familiar with:
So, if you do want internet access, just remove all network
associated options and it will work automagically. If you just
want to connect guest systems together use multicast or socket
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