[Openstack] communication between two VMs

David Gabriel davidgab283 at gmail.com
Tue Mar 14 12:06:28 UTC 2017

Thanks so much Neil for your support.
I fixed this issue.
It is due to the mask. I forgot to set it.

Please do you have any idea about my earlier question entitled
'communication between two ovs bridges' ?

Best regards.

2017-03-14 12:11 GMT+01:00 Neil Jerram <neil at tigera.io>:

> Hi David,
> The interface name "eth1" implies - or at least strongly suggests - that
> each of your VMs has two interfaces (eth0 and eth1).  Is that the case?
> It's also a bit odd that you have to do 'ifconfig eth1 up' by hand.
> Normally the VM OS should do that; and if it isn't, there are probably
> other things that aren't happening for eth1, such as DHCP and setting up
> the routing table for it.
> Could you do what you're trying to do first with just one VM interface,
> eth0, which OpenStack should fully set up for you?
>        Neil
> On Tue, Mar 14, 2017 at 10:51 AM David Gabriel <davidgab283 at gmail.com>
> wrote:
>> Dears,
>> I have defined this simple topology:
>>                     Internet ----- VM1 ----LAN---- VM2 -----Internet
>> I made 'ifconfig eth1 up' for each VM to activate the interface.
>> Then I tried to make the ping between the two VMs but it fails !
>> So I run the bellow command in one VM and re-run the ping in the other one
>> tcpdump -i eth1 icmp and icmp[icmptype]=icmp-echo
>> But I did not receive any packet despite that ICMP packets are allowed in
>> both directions (IN/OUT) !
>> Could you please tell me how to fix this problem.
>> Thanks in advance.
>> Regards
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