What creates the veth* devices and is it necessary to have them in order
to have correct / functional networking?
I''m using Xen 3.0.3 on Debian Etch. I have my dom0 networking being
built
using standard Debian configuration in /etc/network/interfaces.
xend-config.sxp is set to use
(network-script network-dummy)
My domU configurations are set with
vif = [ ''type=ioemu, bridge=xenbr772'' ]
Everything seems to be working as near as I can tell, except that I
don''t
have any veth* devices. My domUs all have a vif device that shows up as
part of the correct bridge when the domU starts up. Do I need those?
/etc/network/interfaces:
auto bond0
iface bond0 inet static
address 192.168.1.10
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1
up ifenslave bond0 eth0 eth1
down ifenslave -d bond0 eth0 eth1
auto bond1
iface bond1 inet manual
pre-up ip li set bond1 up
post-down ip li set bond1 down
up ip link set bond1 address fe:ff:ff:ff:ff:ff
up ip link set bond1 arp off
up ip link set bond1 multicast off
up ifenslave bond1 eth2 eth3
down ifenslave -d bond1 eth2 eth3
auto bond1.718
iface bond1.718 inet manual
vlan-raw-device bond1
up ip li set bond1.718 up
down ip li set bond1.718 down
auto bond1.772
iface bond1.772 inet manual
vlan-raw-device bond1
up ip li set bond1.772 up
down ip li set bond1.772 down
auto xenbr772
iface xenbr772 inet manual
bridge_ports bond1.772
bridge_stp off
bridge_fd 0
up ip link set xenbr772 arp off
up ip link set xenbr772 multicast off
-Chris
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> What creates the veth* devices and is it necessary to have them in order > to have correct / functional networking?What makes you think you should have them? They were present in some versions of Xen and not in others (I regret I can''t remember how the network was set up in 3.0.3).> I''m using Xen 3.0.3 on Debian Etch. I have my dom0 networking being built > using standard Debian configuration in /etc/network/interfaces. > xend-config.sxp is set to use > > (network-script network-dummy) > > My domU configurations are set with > > vif = [ ''type=ioemu, bridge=xenbr772'' ] > > Everything seems to be working as near as I can tell, except that I don''t > have any veth* devices. My domUs all have a vif device that shows up as > part of the correct bridge when the domU starts up. Do I need those? >The vif devices are a representation of what the netback driver is up to. Logically, each vif device in dom0 is connected via "virtual crossover" to a vif in a guest. Because of this, you need them to be up, or you won''t be able to access the guest''s network card (and vice versa). Cheers, Mark -- Dave: Just a question. What use is a unicyle with no seat? And no pedals! Mark: To answer a question with a question: What use is a skateboard? Dave: Skateboards have wheels. Mark: My wheel has a wheel! _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Fri, 6 Jul 2007, Mark Williamson wrote:>> What creates the veth* devices and is it necessary to have them in >> order to have correct / functional networking? > > What makes you think you should have them? They were present in some > versions of Xen and not in others (I regret I can''t remember how the > network was set up in 3.0.3).Nothing makes me think that I should have them. If I use "network-bridge" they show up. Looking at the network-bridge script, it wasn''t immediately obvious (or even not so immediately obvious) what creates the veth devices. There doesn''t appear to be any documentation online (that I could find at least) saying what creates them or whether or not they''re required.>> I''m using Xen 3.0.3 on Debian Etch. I have my dom0 networking being built >> using standard Debian configuration in /etc/network/interfaces. >> xend-config.sxp is set to use >> >> (network-script network-dummy) >> >> My domU configurations are set with >> >> vif = [ ''type=ioemu, bridge=xenbr772'' ] >> >> Everything seems to be working as near as I can tell, except that I >> don''t have any veth* devices. My domUs all have a vif device that >> shows up as part of the correct bridge when the domU starts up. Do I >> need those? > > The vif devices are a representation of what the netback driver is up > to. Logically, each vif device in dom0 is connected via "virtual > crossover" to a vif in a guest. Because of this, you need them to be > up, or you won''t be able to access the guest''s network card (and vice > versa).Sorry, that was really bad writing on my part: that bit was meant to be a further explanation of the first sentence of my email, explaining that my configuration without the veth* devices seems to be working and has the right bridges and vif* devices. The question was actually to find out if I need (for whatever reason) the veth* devices. I don''t appear to need them, but as I said there isn''t a lot of documentation for non-default setups, and most of what I''ve been able to find looks like helpful hints for modifying the default setup. That said, do I need the veth* devices? Is there a downside to not having them? Am I missing out on anything by configuring the bridge setup using the normal Debian /etc/network/interfaces in dom0 instead of trying to modify network-bridge to work with bonded interfaces and vlans? -Chris _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users