Experimental network allowing only SSH - Experiment jaylenw-275931

[Jaylen Wang]

Dear CloudLab Support,

The experimental network (10.10.1.0/24) appears to be allowing only SSH (port 22) while blocking all other TCP ports (when using the small-lan profile). All ports work on the control network. I'm using the same setup as worked a couple weeks prior but no longer seems to work.

Experiment Details:

• Name: jaylenw-275931
• Profile: small-lan
• Cluster: Wisconsin
• Nodes: c220g2-011119 (10.10.1.1) and c220g2-011122 (10.10.1.2)

Test Results from node0 to 10.10.1.2:
Working:

• nc -v 10.10.1.2 22 - succeeds (SSH port)
• ping 10.10.1.2 - succeeds

Blocked:

• nc -v 10.10.1.2 12345 - connection refused
• curl 10.10.1.2:9200 - connection refused (Elasticsearch)
• curl 10.10.1.2:6379 - connection refused (Redis)

All blocked ports work via control network (128.105.145.125).
Verified on node1:

• Services confirmed listening on experimental interface:
• sudo ss -tlnp | grep 12345
• LISTEN 0  1  10.10.1.2:12345  0.0.0.0:*

No firewall rules on hosts. This appears to be infrastructure-level port filtering on the experimental network. Is this expected behavior, or should all ports be open between experiment nodes?

Thanks,

Jaylen

[Leigh Stoller]

> On Oct 28, 2025, at 7:29 AM, Jaylen Wang <jay...@andrew.cmu.edu> wrote:
>
> Blocked:
> • nc -v 10.10.1.2 12345 - connection refused
> • curl 10.10.1.2:9200 - connection refused (Elasticsearch)
> • curl 10.10.1.2:6379 - connection refused (Redis)

Hi. This works for me:

root@node0:~# curl http://node1:9200
{
"name" : "benchmark-node-1",
"cluster_name" : "benchmark-cluster",
"cluster_uuid" : "abkgpelZRdaK73sRzTHgew",
"version" : {
"number" : "7.17.29",
"build_flavor" : "default",
"build_type" : "deb",
"build_hash" : "580aff1a0064ce4c93293aaab6fcc55e22c10d1c",
"build_date" : "2025-06-19T01:37:57.847711500Z",
"build_snapshot" : false,
"lucene_version" : "8.11.3",
"minimum_wire_compatibility_version" : "6.8.0",
"minimum_index_compatibility_version" : "6.0.0-beta1"
},
"tagline" : "You Know, for Search"
}
root@node0:~#

[Jaylen Wang]

Hi,

Yes sorry, turns out I was connecting to the wrong node (from a different experiment) - sorry about that and thanks for the reply.

Best,

Jaylen

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