From: Dan Johansson <kvm@dmj.nu>
To: kvm@vger.kernel.org
Subject: Re: Networkconfiguration with KVM
Date: Mon, 5 Apr 2010 12:09:28 +0200 [thread overview]
Message-ID: <201004051209.28846.kvm@dmj.nu> (raw)
In-Reply-To: <4BB8F540.9010709@mgpi.de>
On Sunday 04 April 2010 22.23:28 Held Bernhard wrote:
> Am 04.04.2010 20:02, schrieb Dan Johansson:
> > 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?
>
> eth1 should not have an IP address:
> # ifconfig eth1 0.0.0.0
>
> br-eth1 is not activated (it's missing in `ifconfig`), and it needs an
> IP address:
> # ifconfig br-eth1 192.168.2.1/24
>
> Even if it works I would explicitly activate br-eth3 too:
> # ifconfig br-eth3 0.0.0.0 up
>
> Looking at the output of `ifconfig` shows that the IP-address of eth0
> (192.168.1.3) doesn't match 192.168.1.1 from your address list, and eth1
> (192.168.4.1) is in a different network than the specified 192.168.2.1/24.
OK, the 192.168.1.3 - 192.168.1.1 is my typo, 192.168.1.3 is the correct IP
for the Host on this interface.
I was first planning to use the 192.168.2.0/24 network here, but I had
forgotten that that was already used somewhere else in my network, so I just
picked the next "free" network address. Sorry for the confusion.
I have tried you suggestions above but I still have no network connection.
# ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:0d:88:52:51:25
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:3 errors:0 dropped:0 overruns:0 carrier:3
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:180 (180.0 B)
Interrupt:18 Base address:0xe880
# ifconfig br-eth1
br-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 MULTICAST MTU:1500 Metric:1
RX packets:65 errors:0 dropped:0 overruns:0 frame:0
TX packets:62 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3518 (3.4 KiB) TX bytes:4750 (4.6 KiB)
# ifconfig br-eth3
br-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:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Regards,
--
Dan Johansson, <http://www.dmj.nu>
***************************************************
This message is printed on 100% recycled electrons!
***************************************************
next prev parent reply other threads:[~2010-04-05 10:09 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
2010-04-04 20:23 ` Held Bernhard
2010-04-05 10:09 ` Dan Johansson [this message]
[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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