Direct answer
For a privacy-conscious digital nomad, problems and verification around DNS leaks come down to two ideas: (1) DNS can be handled differently than the rest of your traffic, and (2) you should verify what your specific device does in the specific network moment you care about. A “problem” is not a single checkbox; it’s the possibility that some DNS requests are resolved by a resolver you did not intend, potentially exposing metadata. “Verification” is the practical process of checking DNS behavior end-to-end from your device, then re-checking when networks, apps, or configurations change.
How it works
DNS is how names (like example.com) become IP addresses. Even when you use encryption for network traffic, name resolution can still involve different components: the operating system, browser or apps, and any VPN/DNS handling in between. A DNS leak is typically inferred when DNS queries appear to reach an unexpected resolver or path. The important operating condition is “from your current environment”: different Wi‑Fi networks, mobile carriers, routers, device DNS settings, and privacy tools can all change where DNS requests go.
Practical context for digital nomads
On travel networks, you may move between public Wi‑Fi, hotels, co-working spaces, and mobile data—each with different network policies. You may also use switching setups (laptop vs. phone, different browsers, OS-level privacy features). These differences matter because a DNS leak can be intermittent: it may show up only when a particular app takes over DNS, when IPv6 is used, or after the VPN reconnects.
A useful way to think about verification is layered: confirm that your DNS queries are resolved in the way you expect, and confirm that the same expectation holds across the networks you actually use.
Limitations
A VPN does not guarantee anonymity, safety, or reliable access in every situation. Performance and availability vary by network, device, location, provider, and time. Also, verification tools and test sites can produce ambiguous results (for example, due to caching, browser behavior, IPv6/IPv4 differences, or how a test interprets “where DNS went”).