On 15.05.2012 10:57, Lei Li wrote: > Hi guys, > > I know the macvtap network is supported by libvirt as forward mode > 'passthrough', I wonder is there anyway to configure the IP address > for its interface? > > For example, If I create a network as below: > > <network> > <name>vdsm-testnet</name> > <uuid>31f6b3b3-e959-0dd1-ad3a-bf95db660415</uuid> > <forward dev='eth0.8' mode='passthrough'> > <interface dev='eth0.8'/> > </forward> > </network> > > For now, I have to set the IP address by 'ifconfig eth0.8 XXX.XXX.XXX.XXX' > after defining the network.

> > How can I set IP address for this VLAN device 'eth0.8' by libvirt, I mean > does libvirt support to assign IP address in this mode now? If does, > what is the > xml format for it?

> > It'd appreciate a lot if anybody could read my post and give me some > suggestions! > > I suppose adding: <ip address='192.168.123.1' netmask='255.255.255.0'/> into <network/> should work, doesn't it?

On 05/15/2012 11:12 PM, Laine Stump wrote: > On 05/15/2012 05:33 AM, Michal Privoznik wrote: >> On 15.05.2012 10:57, Lei Li wrote: >>> Hi guys, >>> >>> I know the macvtap network is supported by libvirt as forward mode >>> 'passthrough', I wonder is there anyway to configure the IP address >>> for its interface? >>> >>> For example, If I create a network as below: >>> >>> <network> >>> <name>vdsm-testnet</name> >>> <uuid>31f6b3b3-e959-0dd1-ad3a-bf95db660415</uuid> >>> <forward dev='eth0.8' mode='passthrough'> >>> <interface dev='eth0.8'/> >>> </forward> >>> </network> >>> >>> For now, I have to set the IP address by 'ifconfig eth0.8 XXX.XXX.XXX.XXX' >>> after defining the network. > If only the guest will use the interface, that isn't necessary. As a > matter of fact, once an interface has been assigned to a guest using > macvtap passthrough mode, the host *can't* use the interface (it can > continue to use it in the other macvtap modes, however), so it's > completely pointless to configure an IP address for that interface on > the host. > > >>> How can I set IP address for this VLAN device 'eth0.8' by libvirt, I mean >>> does libvirt support to assign IP address in this mode now? If does, >>> what is the >>> xml format for it? > A network device being used for a guest macvtap connection only needs an > IP address set on the host if the host will also be using that interface > - the guest does not magically acquire/use the IP address that has been > set on the host, it needs its own IP address, configured on the guest in > the same fashion you would configure any other guest interface (keep in > mind that even in macvtap 'bridge' mode, the host and guest cannot > communicate with each other via a macvtap interface). Otherwise, it's > enough for the interface to be defined on the host (it may also be > necessary for it to be "up" if it's a vlan device - I haven't tried > macvtap with vlans). If you are using RHEL or Fedora, you can do any/all > of that configuration with the virsh iface-define command. For example, > here is the xml file that would define an "eth0.8" interface on a host > (This is *not* the <interface> element of a domain configuration): > > > <interface type="vlan" name="eth0.8"> > <start mode="none"/> > <protocol family="ipv4"> > <ip address="192.168.43.1"/> > </protocol> > <vlan tag="8"> > <interface name="eth0"/> > </vlan> > </interface> > > To get this defined in the system, you would use: > > virsh iface-define eth0.8.xml > > But again, it seems doubtful this is what you really want. > >>> It'd appreciate a lot if anybody could read my post and give me some >>> suggestions! >>> >>> >> I suppose adding: >> >> <ip address='192.168.123.1' netmask='255.255.255.0'/> >> >> into <network/> should work, doesn't it? > No. > > The IP address used by the host for that interface (if any) should be > configured in the normal manner of the host system. The IP address used > by any guests using this interface / network based on this interface > should be configured in the guest just as you would any other interface > (if the guest is configured to get its IP address from DHCP, then you > would need to have a DHCP server running *on a different host* connected > to the .8 vlan. > > (BTW, note that in passthrough mode, only a single guest can connect to > each physical device, so having a <network> defined for passthrough mode > is mostly only useful if you have a pool of devices available. The way > you have it defined above, only a single guest would be able to use that > network.) Hi Laine, / /Thank you for your detailed reply! The vdsm support bridgless network by libvirt through passthrough mode, it just define a network by the xml format: <network> <name>vdsm-XXX</name> <uuid>...</uuid> <forward dev=... mode='passthrough> <interface dev=.../> </forward> </network> I want to let IP address config for the host network enabled. It doesn't have to be connected by a VLAN device, a simpler example, If I create a bridgeless network by passthrough mode, its interface is eth0. What is the xml format for the host to let the IP address configuration enabled?