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Oxygen is a very toxic gas and an extreme fire hazard. It is fatal in concentrations of as little as 0.000001 p.p.m. Humans exposed to the oxygen concentrations die within a few minutes. Symptoms resemble very much those of cyanide poisoning (blue face, etc.). In higher concentrations, e.g. 20
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,-^-. !oYo! /./=\.\______ ## )\/\ ||-----w|| || ||
sysctl -w net.ipv4.icmp_echo_ignore_all=1