Hardware Notes — pihole

• Platform: Raspberry Pi 3 Model B Rev 1.2
• Boot Device: microSD (8 GB)
• Architecture: ARM (32-bit)

Network Interfaces

• eth1 — LAN-facing interface, connected to ls108g:2

Network Role — DNS/Ad-block Only (superseded 2026-06-10)

UCG-Ultra (ucg-ultra) is now the sole Layer-3 gateway, NAT, firewall, and DHCP authority for the LAN (cut over 2026-06-10). pihole no longer performs routing — it is a downstream DNS resolver only (Pi-hole + Unbound), reached via ls108g → tl-sg108e → ucg-ultra.

Topology Context

Internet ↓ NBN NTD (L1/L2) ↓ tl-sg108e (L2 only) ↓ ucg-ultra (L3 boundary — gateway/NAT/DHCP) ↓ usw-lite-8-poe / gs608v4 / ls108g ↓ pihole (DNS only, no routing)