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It turns out the 'NetworkManager' in Knoppix is really knoppix-networkmanager,
and there is no 'wait-online' aspect in its definition.
Whether this approach might work with an 'all-up'...

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I gather that perhaps enabling NetworkManager-wait-online.service
may be what's missing in the current systemd set-up for Knoppix.
See for example:...

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https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=756144
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=758533

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I find that IceWeasel 32.0.3 browser in Knoppix 7.4.2 LiveUSBs often appears to
get confused on doing DNS translations, and needs a wifi disconnect and re-connect
to get surfing going smoothly...