When dhclient assigns an IPv6 address learned via DHCPv6 it always does so with a /64 prefix

Solution Verified - Updated -

Issue

  • IPv6 routing does not work as expected when using the legacy network service scripts and a network range other than /64, such as /96 or /112.
  • No matter what, when DHCPV6C=yes is set in an ifcfg file, the DHCPv6 address provided by the lease is assigned with a /64 prefix:

Environment

  • Red Hat Enterprise Linux (RHEL) 8, 7, 6
  • network service scripts
  • dhcp-client
  • dhclient
  • DHCPv6

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