SIGNALInfrastructure Software·Jun 3, 2026, 5:00 PMSignal65Medium term

Enforcing the First AS in BGP AS_PATHs

Source: Cloudflare Blog

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Enforcing the First AS in BGP AS_PATHs

BGP is vulnerable to routing hijacks and path leaks that negatively impact traffic on the Internet. RPKI helps solve some of these problems, but for some forged paths, we need to rely on a simpler mechanism: First AS enforcement in BGP.

Why this matters
Why now

The continuous evolution of internet infrastructure security highlights the necessity for more robust routing protocols to combat persistent threats like BGP hijacks.

Why it’s important

Sophisticated readers should care because strengthened BGP security helps maintain internet stability, preventing major disruptions that could impact global digital services, finance, and communications.

What changes

A simpler mechanism for BGP security, First AS enforcement, will complement existing RPKI efforts, making internet routing more resilient against certain types of forged paths.

Winners
  • · Internet Service Providers
  • · Cloud Providers
  • · Critical Infrastructure Operators
  • · Internet users
Losers
  • · Malicious actors attempting routing hijacks
  • · State-sponsored cyber attackers
Second-order effects
Direct

Reduced incidence and impact of BGP routing hijacks and path leaks on the internet.

Second

Increased trust and reliability in global internet connectivity, potentially fostering more cross-border digital commerce.

Third

Deterrence of nation-state actors from using BGP manipulation for cyber warfare or surveillance, shifting focus to other attack vectors.

Editorial confidence: 90 / 100 · Structural impact: 40 / 100
Original report

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