Re: [cloudlab-users] Question on Private IP Configuration and Linktest Failure

[Leigh Stoller]

Hi. I just checked a couple of your nodes, and it appears
that the interfaces are there and I can ping the other nodes
in /etc/hosts.

If you have a specific node with a problem, let us know
which node.

Thanks
Leigh

> On Aug 14, 2025, at 12:45 AM, yuxuan <yuxua...@gmail.com> wrote:
>
> I recently created a cluster on CloudLab using r650 nodes. However, I noticed that the servers in the cluster do not have private IPv4 addresses configured, and the linktest failed. I cannot ping node-1 from node-0. Here is my experiment setup: https://www.cloudlab.us/status.php?uuid=ce29166e-78d2-11f0-bc80-e4434b2381fc
> When I run ip address show, I only see the public IP addresses assigned to each node. Could you please let me know whether I need to manually configure private IP addresses for each node, or if they should be automatically assigned?
>

[Mike Hibler]

From the console log it appears that the experiment NIC was not found when
clnode266 booted the first time and your subsequent reboot fixed this.

I will note that you are running Ubuntu 18 which we no longer officially
support. You should move to a supported release (Ubuntu 22 or 24) if
possible.

On Thu, Aug 14, 2025 at 12:45:33AM -0700, yuxuan wrote:
> Hello,

>
> I recently created a cluster on CloudLab using r650 nodes. However, I noticed
> that the servers in the cluster do not have private IPv4 addresses configured,
> and the linktest failed. I cannot ping node-1 from node-0. Here is my
> experiment setup: https://www.cloudlab.us/status.php?uuid=
> ce29166e-78d2-11f0-bc80-e4434b2381fc
>
> When I run ip address show, I only see the public IP addresses assigned to each
> node. Could you please let me know whether I need to manually configure
> private  IP addresses for each node, or if they should be automatically
> assigned?
>

> Thank you for your assistance.
>
> Best regards,
> Yuxuan
>
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