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@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@rigel:/mnt/nfs/pengy/kvm$ virsh create saiph_installed.xml
Domain saiph created from saiph_installed.xml
pengy@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@rigel:/mnt/nfs/pengy/kvm$ ssh 175.91.244.74
pengy@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@saiph:~$ ping www.google.com
^C
pengy@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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