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how does ping zero works? - Unix Linux Stack Exchange
Special (and AFAICT) slightly under-documented behaviour in iputils ping: you ping yourself If you ping 0 this is what happens (heavily edited and commented for clarity):
What is the difference between ping localhost and ping 127. 0. 0. 1?
After executing the following to disable ping replies: # sysctl net ipv4 icmp_echo_ignore_all=1 # sysctl -p I obtain different results from pinging localhost vs 127 0 0 1 # ping -c 3 localhost P
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