It's a 14 byte long identifier, starting with a 2 byte length information (usually ”0x000e”): # hexdump -e '"%07. Note that the ”dhcp.client-id” no longer belongs to a MAC address, an unique ID is used instead! ”dhcp6c” (see above) uses the file /var/lib/dhcpv6/dhcp6c_duid (would be created during first start, if not existing) as unique identity. Other kinds of configuration other than addresses are easy to transmit. Entire prefixes, for example a /48 or a /64, can be delegated, instead of single addresses. # Prefix range for delegation to sub-routers With DNS updates in DHCPv6, clients can enjoy having their human readable names, like rather than just an address like 2001:db8:1:21e:8cff:fe9b:7349. Option dhcp6.domain-search "domain.example" # Range for clients requesting a temporary address Keywords in the file are case-insensitive. The file may contain extra tabs and newlines for formatting purposes. It is parsed by the recursive-descent parser built into dhcpd. The nf file is a free-form ASCII text file. Range6 2001:db8:0:1::129 2001:db8:0:1::254 The nf file contains configuration information for dhcpd, the Internet Systems Consortium DHCP Server. Note, that the router requires to have a interface configured with an IPv6 address out of the defined subnet. Create a dedicated configuration file /etc/dhcp/nf for the IPv6 part of the dhcpd.
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