Creating an autonomous system for fun and profit
10 months ago
- #Networking
- #Autonomous System
- #BGP
- The Internet is a mesh of independent networks, with smaller networks like home setups typically connecting through a single ISP.
- Becoming your own ISP requires owning public IP address space, an Autonomous System Number (ASN), and BGP-capable routers.
- Home users don't need BGP or own IP space because ISPs handle routing and addressing for them.
- Setting up an autonomous system (AS) was motivated by cost-sharing with friends and a personal challenge.
- Steps to create an AS include forming a legal entity, acquiring IP address space, finding peers, applying for an ASN, and sourcing a capable router.
- Public IPv4 addresses are scarce, leading to creative solutions like borrowing from friends or using IPv6.
- Peering with multiple autonomous systems improves redundancy and performance, requiring negotiation and sometimes payment.
- A Cisco Catalyst 6506 router was chosen for its power and affordability, despite its size and age.
- Configuring BGP and setting up the network involved extensive learning and preparation.
- The project, while not strictly necessary, offers pride and a deeper understanding of Internet infrastructure.