Homelab DNS Guide: Local Names, Ad Blocking, and Reliability

DNS is the part of the homelab everyone forgets until the whole house says the internet is down. The network may be fine. The fiber may be fine. The Wi-Fi may be fine. But if the only resolver is offline, every device in the house is suddenly confused.

A good DNS design gives you human-friendly names, ad and tracker filtering, split-horizon records, VPN usability, and a clean way to find services without memorizing IP addresses. The standards matter here: RFC 8375 reserves home.arpa for home networks, while RFC 6762 defines multicast DNS and explains why .local is not a casual private-domain choice.

Design principle: Treat DNS like core infrastructure. Run at least two resolvers, document your local domain, and make sure VPN clients get the same private naming view as LAN clients.

Pick A Local Naming Plan

Use home.arpa for internal home names unless you have a real domain and a clear split-horizon plan. Examples might be nas.home.arpa, proxmox.home.arpa, dns01.home.arpa, printer01.home.arpa, and controller.home.arpa.

Name Type	Example	Use It For
Infrastructure	gateway.home.arpa, switch-core.home.arpa	Routers, switches, AP controllers, DNS, monitoring.
Services	photos.home.arpa, docs.home.arpa	Human-friendly names for apps.
Hosts	nas01.home.arpa, pve01.home.arpa	Actual machines and hypervisors.
Public split	photos.example.com	A name that may resolve public outside and private inside.

Primary And Secondary Resolvers

Two DNS servers do not always behave like active/passive failover. Many clients will use either resolver whenever they feel like it. That means both resolvers need to know the same local records, block lists, upstream behavior, and conditional forwarding rules.

1. Run DNS on two separate hosts if possible, such as a mini PC and a NAS VM, or two small Linux hosts.
2. Keep both resolvers on stable power.
3. Use DHCP to hand out both DNS server addresses.
4. Synchronize local records and block-list policy through configuration management or documented manual change process.
5. Test each resolver directly before trusting client behavior.

Pi-hole, AdGuard Home, Technitium, Or Unbound?

Tool	Best Fit	Notes
Pi-hole	Simple ad blocking and local DNS	Well-known, strong community, and documented Docker deployment.
AdGuard Home	Polished DNS filtering with an approachable UI	Good fit for families and clean dashboards.
Technitium	Advanced local DNS features	Useful when you want a richer authoritative DNS experience.
Unbound	Local recursive resolver	Unbound is a validating, recursive, caching DNS resolver. Often paired behind Pi-hole or AdGuard Home.

DNS Policy And Bypass Control

If you care about DNS filtering, clients should use your resolvers. That means DHCP should advertise your internal DNS servers, firewall rules should block or redirect outbound port 53 where appropriate, and you should understand which devices use DNS over HTTPS or hardcoded resolvers.

DoH reality: DNS over HTTPS can be useful for privacy, but it can also bypass household filtering. Cloudflare documents DoH behavior for 1.1.1.1; decide whether your network policy allows, blocks, or explicitly routes it.

VPN DNS

Your WireGuard peers should receive the same internal DNS view as local trusted clients. Otherwise the VPN connects successfully, but users still cannot find nas.home.arpa, docs.home.arpa, or controller.home.arpa. DNS is part of the remote-access design, not an afterthought.

Validation Checklist

• Each resolver answers local home.arpa records consistently.
• Each resolver can still resolve internet names if the other resolver is offline.
• A client receives both DNS servers from DHCP.
• VPN clients resolve internal names over the tunnel.
• Blocked domains are blocked by both resolvers.
• Internal-only names do not resolve publicly.

Useful Gear And Buyer Notes

Affiliate disclosure: As an Amazon Associate, TechGeeks may earn from qualifying purchases. The product links below are buying references, not a requirement to buy a specific brand or seller. Verify compatibility, seller quality, warranty, and current specs before ordering.

Need	Good Choice	Why It Fits	Affiliate Link
Small DNS host	Raspberry Pi, mini PC, or always-on Linux VM	DNS is light, but it needs stable uptime.	Search Amazon: Raspberry Pi kit
Low-power server	N100/N150 mini PC	A good option if DNS also runs monitoring or small services.	Search Amazon: N100 mini PC
External SSD	Samsung T7 Shield	Better durability and speed than relying on fragile removable storage for small hosts.	Amazon: Samsung T7 Shield 2TB
UPS	CyberPower or APC UPS	DNS should survive short power blips alongside gateway and switch.	Amazon: CyberPower CP1500PFCLCD Amazon: APC BR1500MS2

Common Mistakes

• Using .local for normal DNS records and then fighting mDNS behavior.
• Running one resolver and calling it a day.
• Forgetting to update the secondary resolver when adding local records.
• Letting VPN peers use random public DNS and then wondering why private names fail.
• Assuming "secondary DNS" means clients will only use it during failure.

References

• RFC 8375 Special Use Domain home.arpa
• RFC 6762 Multicast DNS
• Pi-hole Docker Documentation
• Unbound Project
• Cloudflare DNS over HTTPS

Final Thought

Good homelab DNS feels invisible. Names resolve, filtering works, VPN users can find internal services, and the house does not melt down when one small box reboots. That is the goal: boring reliability for the naming layer everything else quietly depends on.

This article is part of the TechGeeks homelab foundation series. The series is designed to build practical home infrastructure in the right order: remote access, segmentation, exposure control, DNS, IoT isolation, and recoverable backups.