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Phase 2: Anycast BGP

Goal: Replace GeoDNS with BGP Anycast for instant failover and optimal routing.

Current State (GeoDNS)​

Current State - GeoDNS

Target State (Anycast BGP)​

Target State - Anycast BGP

BGP Requirements​

RequirementOptions
ASNPrivate (64512-65534) or Public (from RIR)
IP Block/24 minimum (256 IPs) from RIR or provider
TransitVultr, Packet, AWS Direct Connect
SoftwareBIRD, FRRouting, GoBGP

Implementation Options​

Option A: Cloud Provider BGP

  • Vultr BGP (~$5/month per location)
  • Packet/Equinix Metal (native BGP)
  • AWS Global Accelerator (managed anycast)

Option B: Own ASN + IP Space

  • Register ASN with RIR (ARIN, RIPE, APNIC)
  • Acquire /24 IP block
  • Establish peering agreements

BIRD Configuration Example​

# /etc/bird/bird.conf
router id 10.50.5.1;

protocol bgp vultr {
    local as 64512;
    neighbor 169.254.169.254 as 64515;

    ipv4 {
        import none;
        export where net = 198.51.100.0/24;
    };
}

protocol static {
    ipv4;
    route 198.51.100.0/24 blackhole;
}

Benefits​

  • Instant failover: No DNS TTL wait
  • Optimal routing: BGP finds best path
  • DDoS resilience: Traffic distributed globally
  • Single IP: Simpler client configuration