---
title: "Discussion on \"Four rails on one VM: a multi-link RDMA testbed without losing SSH\" | Hashnode"
description: "Discussion on \"Four rails on one VM: a multi-link RDMA testbed without losing SSH\". One NIC per rail, four rails on one VM: computed names, a priority collision a test caught, and one slow link that sped the others up."
url: "https://hashnode.com/posts/four-rails-on-one-vm-a-multi-link-rdma-testbed-without-losing-ssh/6aebe0b832bf0a32a58bea5b"
---

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# [Four rails on one VM: a multi-link RDMA testbed without losing SSH](https://pegasus-nathanael-tech.hashnode.dev/four-rails-on-one-vm-a-multi-link-rdma-testbed-without-losing-ssh?utm_source=hashnode&utm_medium=feed)

One NIC per rail, four rails on one VM: computed names, a priority collision a test caught, and one slow link that sped the others up.

Nov 5 · 5 min read · pegasus-nathanael-tech.hashnode.dev  
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-   [#rdma](https://hashnode.com/tag/rdma)
-   [#linux](https://hashnode.com/tag/linux)
-   [#networking](https://hashnode.com/tag/networking)
-   [#testing](https://hashnode.com/tag/testing)
-   [#buildinpublic](https://hashnode.com/tag/buildinpublic)

## Written by

[Nathanael FETUE](https://hashnode.com/@nathanael-fetue)

@nathanael-fetue · Toulouse

  
[View profile](https://hashnode.com/@nathanael-fetue)

From Cameroon to Cloud Engineering at ISAE-SUPAERO/ENSEEIHT |DeepTech & Distributed Systems

Hi, I'm Nathanael. MSc graduate from Toulouse INP - ENSEEIHT (N7), France. I work on hardware/software co-design and low-level performance. I just completed a six-month research internship at INRIA Rennes, where I designed a hardware isolation mechanism for processing-in-memory processors (UPMEM), measured in a cycle-accurate simulator at 5.54% overhead at most, against 26 to 120% for a software scheme, and validated on FPGA. I write about computer architecture, operating systems, networking (RDMA/InfiniBand) and the move from research to industry. I am looking for my first role in systems and performance engineering, AI infrastructure or low-level software. Stack: C/C++, Go, Python, Verilog, Linux, RDMA, Terraform, Ansible. Contact: nathanaelfetuefoko@gmail.com | linkedin.com/in/nathanael-fetue-foko | github.com/NathanaelFetue

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