dhcpcd is a DHCPv4/IPv4LL/IPv6RS/DHCPv6 quad stack client. It will listen for new interfaces and carrier signals from the kernel so it can quickly configure each interface as it appears. dhcpcd has a powerful DHCP expression engine which makes it easy to decode future RFC DHCP options, or handroll your own.
WWW: https://roy.marples.name/projects/dhcpcd
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