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Back when iptables was first made the default, there were theoretically some users who wouldn't have been able to support it due to having an old /sbin/iptables. But kube-proxy no longer does the things that didn't work with old iptables, and we removed that check a long time ago. There is also a check for a new-enough kernel version, but it's checking for a feature which was added in kernel 3.6, and no one could possibly be running Kubernetes with a kernel that old. So the fallback code now never actually falls back, so it should just be removed.