No internet connection in SENSE's guest network after firmware update
After the SENSE firmware update in version 126.96.36.199, the internet connection in the SENSE guest network stopped working.
This issue is due to the recent enablement of the multicasting functionality in firmware version 188.8.131.52, which causes the guest network configuration to be overwritten by a new IP table rule.
Guest network configuration needs to be re-applied.
Refer to article Can I create a guest WiFi on SENSE? and create the guest network as instructed in the article. However, you need to toggle the main guest network switch off and then on again. Note that the settings must be saved after each setting change.