Drishti
Internet Routing
No center — just routers gossiping paths to neighbors
The internet is a map nobody owns, rebuilt every time a cable breaks
At a glance
- Flows
- IP packets, BGP updates, light pulses in fiber
- Optimizes
- Reachability at lowest hop count
- Persists
- TCP/IP, BGP, and glass under oceans
- Likely future
- Private backbones bypass public gossip
Seven lenses on Internet Routing
Same order every time. Expand the lens you need; first is open by default.
◎ What Exists — What is this, really?
The cloud is someone else’s computer, wired together under the ocean.
Routers, subsea fiber, and Internet Exchange Points are real. Autonomous Systems — ISP networks — agree to pass packets for each other. No central map exists; topology lives in router RAM worldwide.
↻ What Changes — What is stationary vs non-stationary?
Anchor damage and viral streams rewrite the graph daily.
Subsea cables snap. Storms kill power. BGP updates reroute in seconds — failure is normal ops.
A World Cup stream or iOS update can saturate a continental link and force drops until TCP slows senders.
→ What Flows — What moves? Where are bottlenecks?
Packets flow independently; full queues drop without mercy.
flowchart LR Sender --> R1[Router queue] R1 --> R2[Router queue] R2 --> Receiver
Two email packets may cross different continents. Gossip protocols: when a queue fills, routers drop packets — TCP backs off, a decentralized rate limiter.
◈ What Learns — What updates, remembers, optimizes?
Routers learn paths by gossiping with neighbors — and trusting blindly.
BGP neighbors announce reachable prefixes. Shorter paths replace longer ones; updates spread globally. Routers cannot verify truth — a bad announcement sends traffic into a black hole.
▣ What Persists — What survives change?
TCP/IP and BGP persist because every device already speaks them.
Designed in the 1970s–80s, IP’s “forward and forget” scaled past redesign. Upgrading foundations is nearly impossible. Most global bits still ride light through glass on the seafloor.
✦ What Emerges — How do simple rules become complexity?
Global reach emerges from local peering bargains — and rare catastrophes.
ISPs peer at exchanges to cut transit costs. No enforcer holds the graph together. In 1997, AS7007 mis-announced a path to the entire internet and crashed routing for hours.
? What Will Happen — Which futures are becoming likely?
Branches: public mesh, private pipes, or splintered regions.
| Branch | Leading indicator |
|---|---|
| Hyperscaler private fiber | new subsea cables bypassing IXPs |
| Regional splinternets | state firewall policy changes |
| LEO edge access | Starlink-style rural penetration |
Watch BGP hijack incidents and percent of traffic on private backbones — not IPv6 adoption headlines.