[tproxy] errno 92

[Jan Engelhardt]

Hi,


just a note, please add an explanation to the README of the upcoming tproxy 
version, thanks.

When iptable_tproxy is not loaded, the setsockopt() calls might return 
errno 92 (ENOPROTOOPT -- Protocol not available). A quite misleading value, 
especially since tproxy's setsockopt function returns -ENOPROTOOPT if an 
invalid itp.op was specified. But given that -ENOPROTOOPT also shows up 
when tproxy is not loaded, I assume that the general linux networking also 
returns -ENOPROTOOPT, which makes it almost indistinguishable where the 
problem is.



Jan Engelhardt
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