[libvirt-users] Questions on using bridge for KVM on ubuntu 13.10
Peng Yu
pengyu.ut at gmail.com
Tue Mar 11 19:15:38 UTC 2014
Hi,
I have being try to connect a virtual machine to the outside through a
bridge on the host.
The following shows that I have a bridge. And I'm able to start a guest.
pengy at rigel:~$ brctl show
bridge name bridge id STP enabled interfaces
br0 8000.c81f66e29049 no em4
br1 8000.c81f66e29045 no bond0
virbr0 8000.000000000000 yes
pengy at rigel:/mnt/nfs/pengy/kvm$ virsh create saiph_installed.xml
Domain saiph created from saiph_installed.xml
pengy at rigel:/mnt/nfs/pengy/kvm$ brctl show
bridge name bridge id STP enabled interfaces
br0 8000.c81f66e29049 no em4
vnet0
br1 8000.c81f66e29045 no bond0
virbr0 8000.000000000000 yes
I assigned the static ip address (given my our network administrator)
to the guest. But I am not able to connect anywhere outside from the
guest (175.91.244.74). Do you know what might cause the problem? How
to connect the outside network from the guest? Thanks.
pengy at rigel:/mnt/nfs/pengy/kvm$ ssh 175.91.244.74
pengy at 175.91.244.74's password:
Welcome to Ubuntu 13.10 (GNU/Linux 3.11.0-12-generic x86_64)
* Documentation: https://help.ubuntu.com/
System information as of Tue Mar 11 14:04:07 CDT 2014
System load: 0.0 Processes: 76
Usage of /: 78.0% of 999MB Users logged in: 0
Memory usage: 1% IP address for eth0: 175.91.244.74
Swap usage: 0%
Graph this data and manage this system at:
https://landscape.canonical.com/
0 packages can be updated.
0 updates are security updates.
Last login: Tue Mar 11 14:04:07 2014
pengy at saiph:~$ ping www.google.com
^C
pengy at saiph:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 52:54:aa:00:f0:51
inet addr:175.91.244.74 Bcast:175.91.247.255 Mask:255.255.248.0
inet6 addr: fe80::5054:aaff:fe00:f051/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:6720 errors:0 dropped:24 overruns:0 frame:0
TX packets:213 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:513702 (513.7 KB) TX bytes:20976 (20.9 KB)
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:65536 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)
BTW, I'm albe to follow some of the instructions at
http://wiki.libvirt.org/page/Networking#Debian.2FUbuntu_Bridging
But it is not clear to what the followings are for.
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0
*** Sample rc.local file ***
/sbin/sysctl -p /etc/sysctl.conf
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS
--clamp-mss-to-pmtu
exit 0
To verify that the changes have taken affect, please run
tail /proc/sys/net/bridge/*
iptables -L FORWARD
--
Regards,
Peng
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