[ovirt-users] ovirt and gateway behavior

[Martin Sivak]

> This is expected behaviour, even if it’s not very bright. It’s being used as
> a way to detect network is operating correctly.

Correct, it is used to check whether users can reach the host and the
VM that runs on it. There aren't that many options to check that. All
require data exchange of some kind (ICMP req/res, TCP SYN/ACK, some
UDP echo..).

> It is insane as there are so many ways it breaks.  My network admin turns
> off ICMP responses and death to network.

ICMP is an important signaling mechanism.. seriously, it is usually a
bad idea to block it.

> I got this trying to install on a network with out a gateway.

How were your users accessing the VMs? Was this some kind of super
secure deployment with no outside connectivity?


Best regards

Martin Sivak

On Tue, Feb 6, 2018 at 4:32 PM, Ben De Luca <bdeluca at gmail.com> wrote:
> This is expected behaviour, even if it’s not very bright. It’s being used as
> a way to detect network is operating correctly.
>
> I got this trying to install on a network with out a gateway.
>
> It is insane as there are so many ways it breaks.  My network admin turns
> off ICMP responses and death to network.
>
> On Tue 6. Feb 2018 at 16:27, Alex K <rightkicktech at gmail.com> wrote:
>>
>> Hi,
>>
>> I have seen hosts rendered unresponsive when gateway is lost.
>> I will be able to provide more info once I prepare an environment and test
>> this further.
>>
>> Thanx,
>> Alex
>>
>> On Tue, Feb 6, 2018 at 10:40 AM, Yaniv Kaul <ykaul at redhat.com> wrote:
>>>
>>>
>>>
>>> On Feb 5, 2018 2:21 PM, "Alex K" <rightkicktech at gmail.com> wrote:
>>>
>>> Hi all,
>>>
>>> I have a 3 nodes ovirt 4.1 cluster, self hosted on top of glusterfs. The
>>> cluster is used to host several VMs.
>>> I have observed that when gateway is lost (say the gateway device is
>>> down) the ovirt cluster goes down.
>>>
>>>
>>> Is the cluster down, or just the self-hosted engine?
>>>
>>>
>>> It seems a bit extreme behavior especially when one does not care if the
>>> hosted VMs have connectivity to Internet or not.
>>>
>>>
>>> Are the VMs down?
>>> The hosts?
>>> Y.
>>>
>>>
>>> Can this behavior be disabled?
>>>
>>> Thanx,
>>> Alex
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>>>
>>
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>
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