Use safely: Follow these steps only for a router or network you own or are authorised to manage. Never send Router Portal a router password, Wi-Fi key, MAC address, serial number or private screenshot.
Evidence and scopeSOURCE-BACKED · CHECK DATE
Sources2 official references
ScopeModel/OS/network dependent
CredentialsNever universal
ReviewRecheck after UI changes
Quick answer: DFS channels share spectrum with radar systems; an access point may move channels or pause during checks when radar is detected.
What this page covers
Decide whether the extra spectrum is worth the compatibility and availability trade-off.
Step-by-step workflow
- Record the band, channel width and time of the change.
- Check whether the selected channel is DFS in your region.
- Compare a permitted non-DFS channel.
- Retest affected clients and backhaul after the change.
Decision table
| Check | What it tells you | Safe next action |
|---|---|---|
| AP changes channel | Radar event or channel availability check | Compare non-DFS option |
| Some clients disappear | Client DFS support may differ | Use a compatible channel |
| Startup takes longer | Channel availability check may occur | Follow vendor behavior |
Limits and verification
DFS channel lists and power rules are regional. A wider channel is not automatically a better channel.
Official sources
- Cisco — Dynamic Frequency Selection (DFS and radar behavior)
- Apple — Recommended settings for Wi-Fi routers and access points (security and compatibility guidance)
Related Router Portal guides
Wi-Fi guide · Router login troubleshooting
Editorial note: This pilot page is written for one distinct question. Firmware, operating-system menus, ISP policies and regional radio rules can change, so confirm the source and exact device before applying a setting.