From: Dan Johansson <kvm@dmj.nu>
To: kvm@vger.kernel.org
Subject: Re: Networkconfiguration with KVM
Date: Sun, 4 Apr 2010 20:02:03 +0200 [thread overview]
Message-ID: <201004042002.04353.kvm@dmj.nu> (raw)
In-Reply-To: <v2ga50cf5ab1004040600w49da2ce4zed3996aa3b214e6f@mail.gmail.com>
On Sunday 04 April 2010 15.00:26 sudhir kumar wrote:
> On Sun, Apr 4, 2010 at 5:47 PM, Dan Johansson <kvm@dmj.nu> wrote:
> > Hi,
> >
> > I am new to this list and to KVM (and qemu) so please be gentle with me.
> > Up until now I have been running my virtualizing using VMWare-Server.
> > Now I want to try KVM due to some issues with the VMWare-Server and I am
> > having some troubles with the networking part of KVM.
> >
> > This is a small example of what I want (best viewed in a fix-font):
> >
> > +-----------------------------------+
> > | Host |
> > | +----------+ eth0 |---- 192.168.1.0/24
> > | | eth0|-- + |
> > | | VM1 eth1|---(---+------- eth1 |---- 192.168.2.0/24
> > | | eth2|---(---(---+ |
> > | +----------+ | | | |
> > | | | | |
> > | +----------+ +---(---(--- eth2 |---- 192.168.1.0/24
> > | | eth0|---+ | | |
> > | | VM2 eth1|-------+ +--- eth3 |---- 192.168.3.0/24
> > | | eth2|-----------+ |
> > | +----------+ |
> > | |
> > +-----------------------------------+
> >
> > Host-eth0 is only for the Host (no VM)
> > Host-eth1 is shared between the Host and the VM's (VM?-eth1)
> > Host-eth2 and Host-eth3 are only for the VMs (eth0 and eth2)
> >
> > The Host and the VMs all have fixed IPs (no dhcp or likewise).
> > In this example th IPs could be:
> > Host-eth0: 192.168.1.1
> > Host-eth1: 192.168.2.1
> > Host-eth2: -
> > Host-eth3: -
> > VM1-eth0: 192.168.1.11
> > VM1-eth1: 192.168.2.11
> > VM1-eth2: 192.168.3.11
> > VM2-eth0: 192.168.1.22
> > VM2-eth1: 192.168.2.22
> > VM3-eth2: 192.168.3.22
> >
> > And, yes, Host-eth0 and Host-eth2 are in the same subnet, with eth0
> > dedicated to the Host and eth2 dedicated to the VMs.
> >
> > In VMWare this was quite easy to setup (three bridged networks).
>
> Its easy with KVM too. You want 3 NICs per VM, so you need to pass the
> corresponding parameters(including qemu-ifup script) for 3 NICs to
> each VM.
> In the host you need to create 2 bridges: say br-eth1 and br-eth2.
> Make them as the interface on the host in place of the corresponding
> eth interfaces.(brct addbr br-eth1; ifcfg eth1 0.0.0.0 up; brctl addif
> br-eth eth1; assign eth1's ip and routes to breth1; same for eth2).
> In the corresponding qemu-ifup scripts of each interface use
> bridge=br-ethN (This basicaly translates to brctl addif br-ethN $1,
> where $ is the tap device created)
> This should work perfectly fine with your existing NW setup.
> For a quick reference use: http://www.linux-kvm.org/page/Networking
Thanks for your help, but... I am still not able to get it to work the way I
want.
This is what I have don so far:
brctl addbr br-eth1
brctl addbr br-eth3
ip link set eth1 up
ip link set eth3 up
brctl addif br-eth1 eth1
brctl addif br-eth3 eth3
tunctl -b -t qtap1
tunctl -b -t qtap3
brctl addif br-eth1 qtap1
brctl addif br-eth3 qtap3
ifconfig qtap1 up 0.0.0.0 promisc
ifconfig qtap3 up 0.0.0.0 promisc
# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0d:88:52:51:24
inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:443638 errors:0 dropped:0 overruns:0 frame:0
TX packets:758540 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:47041686 (44.8 MiB) TX bytes:990115354 (944.2 MiB)
Interrupt:19 Base address:0xec00
eth1 Link encap:Ethernet HWaddr 00:0d:88:52:51:25
inet addr:192.168.4.1 Bcast:192.168.4.255 Mask:255.255.255.0
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:6
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:360 (360.0 B)
Interrupt:18 Base address:0xe880
eth3 Link encap:Ethernet HWaddr 00:0d:88:52:51:27
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:240 (240.0 B)
Interrupt:16 Base address:0xe480
qtap1 Link encap:Ethernet HWaddr 26:c0:de:df:c5:e4
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:351 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:14742 (14.3 KiB) TX bytes:0 (0.0 B)
qtap3 Link encap:Ethernet HWaddr 26:3e:ba:2d:97:bc
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:6 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:252 (252.0 B) TX bytes:0 (0.0 B)
# brctl show
bridge name bridge id STP enabled interfaces
br-eth1 8000.000d88525125 no eth1
qtap1
br-eth3 8000.000d88525127 no eth3
qtap3
This is the way I start the guest:
kvm -net nic,vlan=1,model=rtl8139,macaddr=52:54:00:12:34:56 -net
tap,vlan=1,ifname=qtap1,script=no,downscript=no -net
nic,vlan=3,model=rtl8139,macaddr=52:54:00:12:34:58 -net
tap,vlan=3,ifname=qtap3,script=no,downscript=no Robbie.img -m 1024
The eth3/br-eth3/qtap3 looks OK (I can ping the "default-GW" on that network
from the guest) but the connection to the "shared" interface (eth1/br-
eth1/qtap1) does not work, I can not ping or ssh to/from the guest from/to the
host. Do not ask me if I can ping any other host on that network - there are
no other host on the network yet, just the Host and the guest.
Any suggestions?
--
Dan Johansson, <http://www.dmj.nu>
***************************************************
This message is printed on 100% recycled electrons!
***************************************************
next prev parent reply other threads:[~2010-04-04 18:02 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-04 12:17 Networkconfiguration with KVM Dan Johansson
2010-04-04 13:00 ` sudhir kumar
2010-04-04 18:02 ` Dan Johansson [this message]
2010-04-04 20:23 ` Held Bernhard
2010-04-05 10:09 ` Dan Johansson
[not found] ` <z2sbb653c6e1004050434g209dcc0cmc330c2e391cd68d4@mail.gmail.com>
2010-04-05 14:35 ` Dan Johansson
2010-04-05 16:00 ` David Mair
[not found] ` <4BBA024A.7060504@mgpi.de>
2010-04-05 16:25 ` Dan Johansson
[not found] ` <4BBA2281.906@mgpi.de>
2010-04-05 18:04 ` Dan Johansson
2010-04-05 18:34 ` David S. Ahern
2010-04-05 20:04 ` Held Bernhard
2010-04-11 15:41 ` Dan Johansson
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