Network Problems

[PHPChris]

Hello together,
I have got a new server and I want to setup the network on it.
The main-ip address of the host is 84.200.193.130.

The rest of the /26 Subnet (131-190) should be available for the virtual machines.

If I setup a OpenVZ machine - the network works perfect.
But if I try to use KVM, the machine seems to not get any network connectivity!

/etc/network/interfaces on host:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
    address 84.200.193.130
    gateway 84.200.193.129
    netmask 255.255.255.192
    
auto vmbr0
iface vmbr0 inet static
    address 84.200.193.130
    netmask 255.255.255.192
    bridge_ports none
    bridge_fd 0
    bridge_stp off
    route add -host 84.200.193.128/26 dev vmbr0

And on my Windows- or Linux-Guest in KVM I setted up:

IP-Address: 84.200.193.131
Netmask: 255.255.255.192
Gateway: 84.200.193.130

But on both - Windows and Linux - the VM isn't able to get any connection!

What did I do wrong?

Thanks for your help!

 

[kotakomputer]

Is this a DS? If yes then from which hosting?

 

[PHPChris]

Yes, it's a dedicated Server running on Debian Squeeze 6.
We host it in a local DataCenter here in Germany. www.accelerated.de

 

[kotakomputer]

Yes, it's a dedicated Server running on Debian Squeeze 6.
We host it in a local DataCenter here in Germany. www.accelerated.de

Since your issue only happen on KVM, it was usually caused by allowed MAC. Try to:

1. use MAC address provides by your hosting (known as Virtual MAC), or
2. some hosting allow us to assign MAC address generated by KVM to their router

 

[PHPChris]

Ok, thanks for your help!
I just changed the /etc/network/Interface as follows:

auto vmbr0
iface vmbr0 inet static
address 84.200.193.130
netmask 255.255.255.192
gateway 84.200.193.129
bridge_ports eth0
bridge_fd 0
bridge_stp none

Ans then I setted up a dhcp server on the host telling the VM to use
address 84.200.193.xxx
netmask 255.255.255.192
gateway 84.200.193.129


This fixes my problem!