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CKA study material · question 84 of 1000

Which kernel setting commonly has to be enabled by hand before cluster networking works?

  1. vm.swappiness
  2. fs.file-max
  3. net.ipv4.ip_forward
  4. net.core.somaxconn
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Answer: C. net.ipv4.ip_forward

Linux does not route IPv4 packets between interfaces by default, so ip_forward is set to 1.

Source: Container Runtimes (Kubernetes) — Enable IPv4 packet forwarding

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