Re: networking problems between vms

[Avi Kivity <avi@redhat.com>]

On 02/07/2011 01:27 PM, Volker Cordes wrote:
> Avi Kivity<avi<at>  redhat.com>  writes:
>
> >
> >  On 02/07/2011 11:51 AM, Volker Cordes wrote:
> >  >  Hello,
> >  >
> >  >  I'm running 4 virtual machines on one host, connected by a network
> >  >  bridge on the host (IP 192.168.0.1). All TAP devices get added to that
> >  >  bridge when starting the vm:
> >  >
> >  >  brctl show
> >  >  bridge name     bridge id               STP enabled     interfaces
> >  >  br0             8000.52fd3fbd954e       no              tap01
> >  >                                                           tap02
> >  >                                                           tap03
> >  >                                                           tap04
> >  >
> >  >  I use virtio networking (but tried the e1000 driver, too). The vms have
> >  >  static IPs 192.168.0.250 - 253 with 192.168.0.1 as the gateway.
> >  >  Connecting from the host to the machines and from the machines to the
> >  >  internet works just fine. The problem lies in connecting from one
> >  >  machine to another. There is a 30 seconds delay until the connection
> >  >  gets established, I tried ssh, http and mysql. After the connection is
> >  >  there, the speed seems to be normal.
> >  >
> >  >  Any hints would be appreciated.
> >  >
> >
> >  Does
> >
> >     brctl setfd br0 0.5
> >
> >  help?
> >
>
> No does not help. The bridge is created in /etc/network/interfaces (debian):
>
> iface tap0 inet manual
> auto br0
> iface br0 inet static
>    bridge_ports          tap0
>    bridge_stp            off
>    bridge_maxwait        0
>    bridge_fd             0
>    address 192.168.0.1
>    netmask 255.255.255.0
>
> I'm using kvm version:
> QEMU emulator version 0.13.0 (qemu-kvm-0.13.0 Debian 0.13.0+dfsg-2), Copyright
> (c) 2003-2008 Fabrice Bellard
> with kvm_intel
>
> on kernel:
> Linux example.com 2.6.32-5-amd64 #1 SMP Wed Jan 12 03:40:32 UTC 2011 x86_64
> GNU/Linux
>
> I also tried -no-kvm, -no-kvm-irqchip and -no-kvm-pit. Didn't help.
>
> Even connecting to the local machine has this 30 seconds delay (only if I use
> 192..., localhost is ok)
>
>

Check reverse dns resolution and firewall rules.  Don't seem to be a kvm 
problem.

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