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Macvlan is a known limitation — the host machine (in this case, the NAS) cannot communicate with containers on a macvlan network. The Docker Compose file in this guide creates a second bridge network (192.168.100.2) specifically so the NAS can reach Pi-hole. Use that IP if you want the NAS itself to use Pi-hole for DNS.

Pick a static IP outside your router’s DHCP range. For example, if your DHCP pool is 192.168.1.100–192.168.1.200, something like 192.168.1.198 or 192.168.1.10 works well. The important thing is that it doesn’t conflict with another device and won’t be handed out by DHCP.

Ports 53, 80, and 443 are commonly used by other Synology packages, which means Pi-hole can’t bind to them on the default bridge network without conflicts. A macvlan network gives Pi-hole its own dedicated IP address on your LAN, so it gets exclusive access to those ports.