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seen Nov 10 at 8:53

Mar
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awarded  Supporter
Dec
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awarded  Student
Dec
28
comment Networking looks OK, but does not work at all
Since I can't answer my own question because I do not have enough reputation on this stackexchange (yet): I found the root cause. I'll share it here for anyone who hits the same problem. The problem was that Sabayon ships with ufw (a firewall, it seems) per default. For some unknown reason, this failed to initialize properly. Doing # rc-update del ufw and rebooting fixed the issue for me.
Dec
28
awarded  Editor
Dec
28
revised Networking looks OK, but does not work at all
add some diagnostic output
Dec
28
asked Networking looks OK, but does not work at all