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Property:Feature-Overlay

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Term

Goto:   FRITZ!OS   -   SMW-Browser

Details

A Feature-Overlay is a custom set of variables which disable Box-Features.

The silly idea to degrade a box derives from times when some ISPs billed separately for WLAN or an ISDN FON port.
Even an USB-Host port was considered an extra. Thanks god these times are mostly past, at least in Germany.

However, today there are still contracts for DOCSIS internet and VoIP with separate costs for linear TV over DVB-C.
Depending on the contract it may be necessary to disable the DVB-C streaming and SAT-IP capabilities of cable models.

FRITZ!OS

In FRITZ!OS a Feature-Overlay is a whitelisted subset of boolean Config-Environment variables stored in featovl.cfg.
It is maintained by boxfeaturedisable which can (fw 7.59):

featovl.cfg is applied to the Config-Environment at the end of rc.conf. Simplified from fw 7.59:

# filter out invalid entries
boxfeaturedisable --check "$(cat featovl.cfg)" 

# apply the exports
for featovl in $(grep "^CONFIG_" featovl.cfg); do
  export "${featovl}"
done

Besides the fact that TR-069 could call boxfeaturedisable to create a Feature-Overlay only docsis_feature_disable calls
it directly. This script is installed on cable models and called by docsis_state_changed once SNMP config is ready.

See the docsis_feature_disable article for details about crippled ISP cable models.

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