OpenWRT
In some countries (e.g. Germany) weather stations use some 5 GHz WiFi frequency ranges. In order to avoid interference (channels 49 and higher) with those weather stations devices must listen if a weather station is currently sending (-> DFS (Dynamic Frequency Selection)) and immediately change its WiFi channel. DFS must be applied in frequency bands 5,25 GHz to 5,35 GHz (channels 52 - 64) and 5,47 GHz to 5,725 GHz (channels 100 -140).
Further reading:
- https://www.elektronik-kompendium.de/sites/net/1712061.htm (German)
- https://de.wikipedia.org/wiki/Dynamic_Frequency_Selection
- https://wiki.opennet-initiative.de/wiki/OpenWrt_DFS
Some phones seem to only handle lower bands/channels (36-54) and not those in the 160+
Source: https://productforums.google.com/forum/#!topic/phone-by-google/bVVIdKUzWCg
Some (probably all) phones do not correctly handle multiple networks having the same SSID (say you have the same SSID for 2 and 5 GHz). You will see instable WiFi connections.
The only resolution I found out was to rename one of the two interfaces so that both networks have a different SSID.
Edit /etc/config/dhcp and add the following:
config domain
option name 'login.sharkwork'
option ip '192.168.1.20'Restart service or reboot: /etc/init.d/dnsmasq restart
Domain needs to be prefixed with http:// in the browser.
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