ICMP Signal works, 5 seconds later it doesn't work?

[sorlflo]

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Hello Forum Users


I wrote recently about my problem, but I had luck and restore the environment doesn't work.

My System is a physical Server with Suse Enterprise Server, and a virtual Machine with a Ubuntu Server.

I try the net structur just with a ICMP Signal by now.

my config about my Problem is following:


pyhsical machine: eth1; >virtual bridge: br0,> virtual nic:vnet1 (subnet 1)

this going to transfer in eth0 in the virtual machine

FORWARDING to:

eth1 in the virtual machine

then through ;
virtual nic: vnet0; > virtual bridge: br1; >physical machine: eth0 (subnet2)

First off all my communication between brX and vnetX (this ones in the same subnet) just works if I flush the iptables rules, generated by libvirt.

Then the problem:

I ping between br0 and vnet1: It's work! 5 seconds later. It isn't work but then I can ping between br1 and vnet0. And the other way not work.

My problem also that all my nics: ethX, brX and vnetX are permanent going down or disappear completely. This with tipping the command:
„ip addr show“ And I don't now how I get them to stay.

It is a arp Problem? I read about but I don't understand it until now.

My result of brctl show:

bridge name  stp enabled  interfaces
br0		    no	             eth1
                                     vnet1
br1		    no		      eth0
                                      vnet0
virbr0	        yes         virbr0-nic

I have tried to take away the bridge virbr0 for testing, and start my VM with a few network parameters in the xml file, but then my virtual machine doesn't start. But there must a way to do this, or is this wrong.

I know there are to ways to connect VM's:
With a normal bridge (br) and a virtual bridge (virbr).

Thank you Flo

[sorlflo]

Hi Forum Users,


The bridges doesn't work reliable if the nic's it build of, vnetX and ethX not wired with a partner. I have no wire in my physical ethX. It's mean there was no wire to my router.


But now following:

I have a successfully ICMP signal which forwarding in my virtual machine.

When I use following command:

ping -I 192.168.2.x  192.168.178.y

I ping from one bridge to the other one. Through my VM.

But now it's away again.

I don't no why?

Now I can ping from br0 to br1 without it recognized from my forwarding iptable rule in my virtual machine. And both br0 and br1 are in different subnets.

I have no forwarding activ in my physical server.

Thank you for reading,
Flo