F9 and KVM

Suren Karapetyan surenkarapetyan at gmail.com
Fri May 9 16:50:04 UTC 2008


Gerry Reno wrote:
> Suren Karapetyan wrote:
>> It would help if You did "ifconfig" and "brctl show" on the host PC 
>> while guest is running and posted it here. That way we could find out 
>> what's happening.
>>
>> BTW: Is eth0 on host configured via DHCPD or static?
>>
> 
> I made some small progress.  I had an existing bridge br0 and 
> virt-manager created a second bridge virbr0.  vnet0 and vnet1 became 
> attached to my br0 bridge and not virbr0.  Now I don't see why that 
> should be a problem but apparently it is.  So I destroyed my bridge.  
> Changed the vm defines to reflect virbr0 and restarted everything.  So 
> now in the guest I can ping 192.168.122.1 which is the virbr0.  But 
> that's all I cannot get access to the lan.  When I originally had setup 
> the images via virt-manager gui I selected shared networking and it was 
> showing br0(eth0) which was my original bridge.  I was expecting it 
> would slave to this and then I would have a bridge to my lan address 
> space.  But this did not work and I had access to nothing.  So how can I 
> define a bridge on my lan and have the guests slave to it so that they 
> can get either a lan dhcp address or a static lan address?
> 
> Here are the current conditions:
> 
> eth0      Link encap:Ethernet  HWaddr 00:1A:4D:5E:F6:36          inet 
> addr:192.168.1.15  Bcast:192.168.1.255  Mask:255.255.255.0
>          inet6 addr: fe80::21a:4dff:fe5e:f636/64 Scope:Link
>          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
>          RX packets:27833013 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:36339801 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:1000
>          RX bytes:3841204956 (3.5 GiB)  TX bytes:1079379274 (1.0 GiB)
>          Interrupt:19 Base address:0xc000
> 
> lo        Link encap:Local Loopback          inet addr:127.0.0.1  
> Mask:255.0.0.0
>          inet6 addr: ::1/128 Scope:Host
>          UP LOOPBACK RUNNING  MTU:16436  Metric:1
>          RX packets:142210 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:142210 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:0
>          RX bytes:286289024 (273.0 MiB)  TX bytes:286289024 (273.0 MiB)
> 
> virbr0    Link encap:Ethernet  HWaddr 00:FF:12:85:0F:D0          inet 
> addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
>          inet6 addr: fe80::1cc7:34ff:fe82:fdbc/64 Scope:Link
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:5925 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:5228 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:0
>          RX bytes:432804 (422.6 KiB)  TX bytes:4295659 (4.0 MiB)
> 
> vnet0     Link encap:Ethernet  HWaddr 00:FF:12:85:0F:D0          inet6 
> addr: fe80::2ff:12ff:fe85:fd0/64 Scope:Link
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:105 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:269 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:500
>          RX bytes:17377 (16.9 KiB)  TX bytes:17621 (17.2 KiB)
> 
> vnet1     Link encap:Ethernet  HWaddr 00:FF:16:0F:7D:A0          inet6 
> addr: fe80::2ff:16ff:fe0f:7da0/64 Scope:Link
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:150 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:147590 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:500
>          RX bytes:41461 (40.4 KiB)  TX bytes:8863921 (8.4 MiB)
> 
> [root at grp-01-10-01 TEST1]# brctl show
> bridge name     bridge id               STP enabled     interfaces
> pan0            8000.000000000000       no
> virbr0          8000.00ff12850fd0       yes             vnet0
>                     
>                                                       vnet1
> 
> 
> 
> Regards,
> Gerry
> 

Your initial configuration was right.
I don't have much skills with bridges so maybe someone more experienced 
could correct me but maybe You need ip_forwarding.
And also, bridged packets travel through iptables so You may need some 
rules (libvirtd adds some but I don't remember if they are enough).

Could You switch to Your previews settings and post outputs for 
ifconfig, brctl show, iptables -L -n -v?




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