Bridges problem with kvm

Bridges problem with kvm

[carlopmart]

Hi all,

  I have a strange problem with my bridges configuration. I have a 
rhel5.4 host with kvm-83-105 package installed. This host has two 
bridged interfaces defined to use with kvm guests:

DEVICE=prodif
ONBOOT=yes
TYPE=Bridge
IPADDR=172.26.50.14
NETMASK=255.255.255.240
DELAY=0
STP=off

and

DEVICE=iscsif
ONBOOT=yes
TYPE=Bridge
DELAY=0
STP=off

  I have installed two kvm guests (rhel5.4 also) with two virtual 
interfaces using virtio driver on one guest and e1000 driver on the 
other guest.

  My problem is: when I do a ping between these guests over prodif 
bridge all works as expected: ping responds. But if I do another ping 
over iscsif bridge doesn't works. The only difference between prodif 
bridge and iscsif bridge is that prodif has an IP address.

  More info:

  a) brctl show on host:

bridge name     bridge id               STP enabled     interfaces
iscsif          8000.c201b3289830       no              vnet3
                                                         vnet1
prodif          8000.226af089f4c3       no              vnet2
                                                         vnet0

  b) sysctl.conf on host:

net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

  I don't have iptables rules defined and net.ipv4.ip_forward is 
disabled (but if I put sysctl -w net.ipv4.ip_forward=1, result is the same).

  What am I doing wrong??

  Many thanks.

-- 
CL Martinez
carlopmart {at} gmail {d0t} com

Re: Bridges problem with kvm (SOLVED)

[carlopmart]

carlopmart wrote:
> Hi all,
> 
>  I have a strange problem with my bridges configuration. I have a 
> rhel5.4 host with kvm-83-105 package installed. This host has two 
> bridged interfaces defined to use with kvm guests:
> 
> DEVICE=prodif
> ONBOOT=yes
> TYPE=Bridge
> IPADDR=172.26.50.14
> NETMASK=255.255.255.240
> DELAY=0
> STP=off
> 
> and
> 
> DEVICE=iscsif
> ONBOOT=yes
> TYPE=Bridge
> DELAY=0
> STP=off
> 
>  I have installed two kvm guests (rhel5.4 also) with two virtual 
> interfaces using virtio driver on one guest and e1000 driver on the 
> other guest.
> 
>  My problem is: when I do a ping between these guests over prodif bridge 
> all works as expected: ping responds. But if I do another ping over 
> iscsif bridge doesn't works. The only difference between prodif bridge 
> and iscsif bridge is that prodif has an IP address.
> 
>  More info:
> 
>  a) brctl show on host:
> 
> bridge name     bridge id               STP enabled     interfaces
> iscsif          8000.c201b3289830       no              vnet3
>                                                         vnet1
> prodif          8000.226af089f4c3       no              vnet2
>                                                         vnet0
> 
>  b) sysctl.conf on host:
> 
> net.bridge.bridge-nf-call-ip6tables = 0
> net.bridge.bridge-nf-call-iptables = 0
> net.bridge.bridge-nf-call-arptables = 0
> 
>  I don't have iptables rules defined and net.ipv4.ip_forward is disabled 
> (but if I put sysctl -w net.ipv4.ip_forward=1, result is the same).
> 
>  What am I doing wrong??
> 
>  Many thanks.
> 

I find the problem: mac address used on kvm guests. I have chegend to 
00:XX:XX:XX:XX:XX.

-- 
CL Martinez
carlopmart {at} gmail {d0t} com