Re: networking problems between vms

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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)


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