===== Network Infrastructure at 10K+ Snapshotted VM Scale =====
  * **Speaker**: Shivendra Srivastava, Prashant Kumar Singh, Kshitij Gupta
  * **Room**: 332
  * **Time**: Friday, [[https://pretalx.seagl.org/2026/talk/FPTRLD.ics|Oct 23rd 17:00 – 17:50]]  

  * **Format**: Talk (50 min)
  * **Difficulty**: Advanced
  * **Track**: Technical
  * **Additional Tags**: Linux Networking, Virtualization, eBPF, Serverless, AWS Lambda, Scalability, Geneve Tunneling
  * **Experience**: Senior Engineering Leaders and Principal Engineers at AWS Lambda specializing in serverless compute, distributed systems, and networking infrastructure.  

==== Description: ====  
Running thousands of snapshotted VMs pushes Linux networking primitives to their limits. This talk covers battle-tested strategies for designing large-scale network topologies that balance performance, isolation, and resource efficiency. 

The session will dive into practical solutions for high-density VM environments, including the use of Geneve tunneling for scalable overlay networks, eBPF-accelerated networking to bypass kernel bottlenecks and achieve line-rate performance, and stateless NAT techniques that enable network reuse without connection tracking overhead. The speakers will also discuss smart firewall design using device prefix-based iptables/nftables rules and namespace pooling strategies to minimize operation costs during rapid VM snapshotting. Finally, the talk addresses RTNL lock contention and its operational impact on large-scale deployments. Attendees will learn how to architect network stacks where VMs are frequently cloned, restored, and migrated while maintaining security boundaries and predictable performance.

**Target Audience:**  
  * Cloud infrastructure and systems engineers
  * Linux networking and kernel specialists
  * Architects designing high-density virtualization or serverless platforms