What does Double NAT mean?
Double NAT describes traffic passing through two address-translating layers, such as a personal router behind a provider gateway. It can complicate inbound connectivity or some local arrangements, but ordinary outbound HTTP playback can still work. Its presence is not a universal buffering diagnosis.
Why it matters
Identify the real operating modes before changing anything. A second box may already operate only as an access point. Bridge and access-point modes can affect DHCP, routing and provider services, so follow both manufacturers' guidance and preserve the working configuration. Do not enable broad DMZ exposure simply because a troubleshooting page mentions double NAT.
A practical example
A household may have two routers and perfectly stable video, while another has a weak wireless backhaul between them. The latter's delivery problem should not be attributed to translation without a controlled comparison.
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Related terminology: Domestic and international coverage, Downloader shortcut code.
For practical setup and troubleshooting, browse the journal or support guides.