The Everything Feed - All Packet Pushers Pods TNO052: Internet History with Len Bosack
Dec 12, 2025
Len Bosack, co-founder of Cisco Systems and CEO of XKL, shares his fascinating journey from mathematician to tech pioneer. He describes his groundbreaking work on multi-protocol routers, ARPANET connections, and the early days of networking at Stanford. Len discusses the commercialization of routers and the evolution of internet standards, all while stressing the importance of mentoring future engineers. He also touches on the challenges of modern optical networking and the implications of AI on the tech landscape.
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Packing Six Ethernet Ports On One Card
- The AGS+ board packed six 10Mb Ethernet ports using large FPGAs and careful ROM/FPGA loading.
- That design was a key step toward multi-port, multi-protocol routers.
Design Minimal, Build Consensus
- The BGP/EGP era required minimal workable protocols to gain consensus amid flame wars.
- Reusing TCP as a transport and avoiding over-specification enabled durable routing protocols.
Design For Invisible Reboots
- Engineer devices so firmware reloads and crashes do not affect forwarding.
- Test and validate control/data separation to make reboots invisible to users.