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From Trevor Francis <>
Subject Re: Problem with bridge
Date Sat, 15 Dec 2012 17:00:35 GMT
Have you set the KVM traffic labels within Cloudstack when you spun up your zone?

Do you have IPV4 forwarding on?

cat /proc/sys/net/ipv4/ip_forward
If not, turn it on, and make it permanent by:
sysctl -w net.ipv4.ip_forward=1
net.ipv4.ip_forward = 1
I also had problems with system ISOs because the latest incubating for Ubuntu (this may have
already been fixed) does not include the system VM ISOs when you do a apt-get install cloud-agent.
If you did a source install, it may be different.

Just my initial thoughts.

Trevor Francis
46 Labs |
720-214-3643- Voice
Solutions Provider for the Telecom Industry

On Dec 15, 2012, at 10:55 AM, Aleksey Samarin <> wrote:

> Hi all!
> I have a problem with bridge.
> My setup is: Ubuntu/KVM.
> CS 4.0.0-incubating, advanced installation.
> 3 bridges: mgmtbr0, inetbr0 and guestbr0.
> mgmtbr0 - storage+management. inetbr0 - internet. guestbr0 - guest traffic.
> So, after install and configure, ssmv and cpvm starts well,
> but they can't access gateway via inetbr0.(can't ping gw from ssvm or cpvm)
> Trying to find the problem, ran tcpdump on kvm host and saw something like this
> tcpdump -i inetbr0
> ARP, Request who-has tell hostname, length 46
> STP 802.1w, Rapid STP, Flags [Forward], bridge-id
> 8000.d0:7e:28:07:77:0e.8016, length 47
> IP hostname > UDP, length 52
> arp -n
> Address                  HWtype  HWaddress           Flags Mask            Iface
>              ether   fe:00:a9:fe:02:52   C                     eth0
> Nothing about gateway, any thoughts?
> All the best Alex

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