[libvirt-users] Network inoperable with QEMU arm example image
Larry Brown
larry.brown at dimensionnetworks.com
Wed Sep 12 17:19:31 UTC 2012
I am running Fedora 16 64bit and installed libvirt. I have the VM
running with arm emulation with this one issue I can't figure out. I
used Virtual Machine Manager to manage the VM and can access its console
there. The Ethernet appears to be eth1 and the guest can set an IP on
it etc. However, I cannot see any traffic from the Host when dumping
any of the interfaces. I've tried several combinations of network
setups using the GUI and none appear to work. Optimally I'd like to
bridge to my primary interface (em1) and be able to pull an address and
talk directly to my network so I can download packages etc while in the
VM. I tried setting up networking in that fashion with:
Source Device : em1 with macvtap
Device Model: Hypervisor Default
Source Mode: Bridge
but alas I cannot pull dhcp nor can I set a static address and ping
other interfaces on the network.
It also appears that every time I start the VM it creates another vnetX
interface.
One of the troubleshooting pages I came across listed all the tools but
nothing about what to look for:
1) virsh net-list --all
Name State Autostart
-----------------------------------------
default active yes
2) brctl show
bridge name bridge id STP enabled interfaces
virbr0 8000.52540029e6c7 yes virbr0-nic
vnet0
vnet1
vnet2
vnet3
vnet4
3) sysctl net.bridge.bridge-nf-call-iptables
sysctl net.bridge.bridge-nf-call-iptables = 1
4) iptables -L -v -n
Chain INPUT (policy ACCEPT 767K packets, 189M bytes)
pkts bytes target prot opt in out source
destination
0 0 ACCEPT udp -- virbr0 * 0.0.0.0/0
0.0.0.0/0 udp dpt:53
0 0 ACCEPT tcp -- virbr0 * 0.0.0.0/0
0.0.0.0/0 tcp dpt:53
0 0 ACCEPT udp -- virbr0 * 0.0.0.0/0
0.0.0.0/0 udp dpt:67
0 0 ACCEPT tcp -- virbr0 * 0.0.0.0/0
0.0.0.0/0 tcp dpt:67
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source
destination
0 0 ACCEPT all -- * virbr0 0.0.0.0/0
192.168.122.0/24 state RELATED,ESTABLISHED
0 0 ACCEPT all -- virbr0 * 192.168.122.0/24
0.0.0.0/0
0 0 ACCEPT all -- virbr0 virbr0 0.0.0.0/0
0.0.0.0/0
0 0 REJECT all -- * virbr0 0.0.0.0/0
0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- virbr0 * 0.0.0.0/0
0.0.0.0/0 reject-with icmp-port-unreachable
Chain OUTPUT (policy ACCEPT 532K packets, 79M bytes)
pkts bytes target prot opt in out source
destination
5) ps -ef | grep dnsmasq
nobody 12382 1 0 Sep11 ? 00:00:00 /usr/sbin/dnsmasq
--strict-order --bind-interfaces
--pid-file=/var/run/libvirt/network/default.pid --conf-file=
--except-interface lo --listen-address 192.168.122.1 --dhcp-range
192.168.122.2,192.168.122.254
--dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases
--dhcp-lease-max=253 --dhcp-no-override
6) ifconfig -a
em1 Link encap:Ethernet HWaddr 00:19:B9:48:2B:BA
inet addr:10.45.212.46 Bcast:10.45.212.255
Mask:255.255.255.0
inet6 addr: fe80::219:b9ff:fe48:2bba/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:19048593 errors:95686 dropped:154 overruns:0
frame:98437
TX packets:10619346 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:12559170813 (11.6 GiB) TX bytes:1700214519 (1.5 GiB)
Interrupt:16
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:2978074 errors:0 dropped:0 overruns:0 frame:0
TX packets:2978074 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:847201395 (807.9 MiB) TX bytes:847201395 (807.9 MiB)
macvtap0 Link encap:Ethernet HWaddr 52:54:00:AC:7F:0C
inet6 addr: fe80::5054:ff:feac:7f0c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:294814 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:42804350 (40.8 MiB) TX bytes:468 (468.0 b)
virbr0 Link encap:Ethernet HWaddr 52:54:00:29:E6:C7
inet addr:192.168.122.1 Bcast:192.168.122.255
Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:621 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:43217 (42.2 KiB)
virbr0-nic Link encap:Ethernet HWaddr 52:54:00:29:E6:C7
BROADCAST 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:500
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
vnet0 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:38159 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:1995337 (1.9 MiB)
vnet1 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:37299 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:1949439 (1.8 MiB)
vnet2 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:36154 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:1888745 (1.8 MiB)
vnet3 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:35068 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:1832375 (1.7 MiB)
vnet4 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:207 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:10896 (10.6 KiB)
7) cat /proc/sys/net/ipv4/ip_forward
1
Any help I can get to resolve this would be greatly appreciated. Very
frustrating...
Larry
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