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user1424739
Asked: 2021-03-02 21:53:34 +0800 CST

Are /proc/sys/net/ipv4/icmp_echo_ignore_all and net.ipv4.icmp_echo_ignore_all equivalent?

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According to the following test, it seems that net.ipv4.icmp_echo_ignore_all and /proc/sys/net/ipv4/icmp_echo_ignore_all are exactly the same. Are they exactly the same? If so, which way is the best to use?

$ sudo sysctl -w net.ipv4.icmp_echo_ignore_all=1
net.ipv4.icmp_echo_ignore_all = 1
$ cat /proc/sys/net/ipv4/icmp_echo_ignore_all
1
$ sudo tee /proc/sys/net/ipv4/icmp_echo_ignore_all <<< 0
0
$ sysctl net.ipv4.icmp_echo_ignore_all
net.ipv4.icmp_echo_ignore_all = 0
kernel

1 Answers

  1. Yes, see man sysctl (emphasis mine):

    sysctl is used to modify kernel parameters at runtime.  The parameters available are those
listed under /proc/sys/.  Procfs is required for sysctl support in  Linux.   You  can  use
sysctl to both read and write sysctl data.

    It depends on what you want to do. For one-off changes, I suppose it makes no difference. For maintaining a configuration, /etc/sysctl.conf and /etc/sysctl.d are much more convenient.

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