Re: Deploying VMs over multiple sites

[Niky Riga]

[moving this to geni-users since there are probably more people there
that can help you with this]

Hi Adrian,

I think there are two different issues here:

1. On your VMs you can not see the gre tunnel interfaces. Another
experimenter has seen this problem before and I was able to reproduce it
just did not have a chance to send an email about it (I will send a
follow up email just for this)

2. You would like to connect an OVS to a host over GRE, I have not
tried this personally but I have heard that this might not work the way
you expect it to because these tunnels are layer 3.

If you hit a deadend with GRE tunnels, there is another way to connect
VMs from multiple sites together, but this functionality is still in
alpha testing mode and it is limited to few sites, but you are welcome
to use it if you want (I will send you more info about it).

Cheers,
Niky

PS: If you are not already a member of geni-...@googlegroups.com I
would suggest that you join so that you are able to post questions.
You can subscribe (and manage preferences) at:
http://groups.google.com/group/geni-users


Adrian Lara wrote:
> Dear GENI experts,
> I'm trying to create a topology with 3 Openvswitch nodes, a controller
> and a few hosts. Nodes are deployed at uky, gatech and nyu (please see
> attachment).
>
> When I create all vm's on the same site, then the nodes have one network
> interface for each link I add and all nodes can ping each other.
>
> How does this work for these "gre-tunnels"? For example, my node OVS1
> only has 2 network interfaces, one for Host1 and one for Host2, but
> nothing connects to OVS2.
>
> Am I missing something? My starting goal is to have a learning switch
> running on the Ctrlr node and to be able to ping Host4 from Host1, for
> example.
>
> Thanks a lot for your help!
> Adrian
>
> _______________________________________________
> experimenters mailing list
> experi...@geni.net
> http://lists.geni.net/mailman/listinfo/experimenters

[Leigh Stoller]

> [moving this to geni-users since there are probably more people there
> that can help you with this]

Hi, there is an attachment mentioned in the message, but it was not
included. Can we get that so we can better picture of what you are trying
to do.

I have not heard of any bug reports with GRE tunnels not being seen in the
guest. Note though, that you do not see them as GRE tunnels, they just look
like a layer two ethernet interface connected to another node in a point to
point link. You just use it like a plain ethernet interface.

Lbs

[Niky Riga]

Hi Leigh sorry I should have forwarded Adrian's original email.

I have added the attachment here, and I am sending the email about the
GRE tunnels in a sec.

Cheers,
niky

PS: the other emails about the gre tunnels was at he...@geni.net that is
why you haven't seen them

[Leigh Stoller]

> Niky, I´m definitely interested in connecting VMs from different sites, so please feel free to share info about the other solution. I´ll be happy to try it and let you know how it went.

Hi. I think the gist is that you should edit the GRE links and change the
type from gre-tunnel to egre-tunnel.

Lbs