DHCPv6 server

VyOS provides DHCPv6 server functionality which is described in this section. In order to use the DHCPv6 server it has to be enabled first:

set service dhcpv6-server

To restart the DHCPv6 server (operational mode):

restart dhcpv6 server

To show the current status of the DHCPv6 server use:

show dhcpv6 server status

Show statuses of all assigned leases:

show dhcpv6 server leases

DHCPv6 server options

DHCPv6 server preference value

Clients receiving advertise messages from multiple servers choose the server with the highest preference value. The range for this value is 0…255. Set a preference value for the DHCPv6 server:

set service dhcpv6-server preference <preference value>

Delete a preference:

set service dhcpv6-server preference

Show current preference:

show service dhcpv6-server preference

Specify address lease time

The default lease time for DHCPv6 leases is 24 hours. This can be changed by supplying a default-time, maximum-time and minimum-time (all values in seconds):

set service dhcpv6-server shared-network-name <name> subnet <ipv6net> lease-time {default <default-time> | maximum <maximum-time> | minimum <minimum-time>}

Reset the custom lease times:

delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> lease-time {default | maximum | minimum}

Show the current configuration:

show service dhcpv6-server shared-network-name <name> subnet <ipv6net> lease-time {default | maximum | minimum}

Specify NIS domain

A Network Information (NIS) domain can be set to be used for DHCPv6 clients:

set service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-domain <nis-domain-name>

To Delete the NIS domain:

delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-domain <nis-domain-name>

Show a configured NIS domain:

show service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-domain <nis-domain-name>

Specify NIS+ domain

The procedure to specify a Network Information Service Plus (NIS+) domain is similar to the NIS domain one:

set service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-domain <nisplus-domain-name>

To Delete the NIS+ domain:

delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-domain <nisplus-domain-name>

Show a configured NIS domain:

# show service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-domain <nisplus-domain-name>

Specify NIS server address

To specify a NIS server address for DHCPv6 clients:

set service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-server <IPv6 address>

Delete a specified NIS server address:

delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-server <IPv6 address>

Show specified NIS server addresses:

show service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-server

Specify NIS+ server address

To specify a NIS+ server address for DHCPv6 clients:

set service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-server <IPv6 address>

Delete a specified NIS+ server address:

delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-server <IPv6 address>

Show specified NIS+ server addresses:

show service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-server

Specify a SIP server address for DHCPv6 clients

By IPv6 address

A Session Initiation Protocol (SIP) server address can be specified for DHCPv6 clients:

set service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-address <IPv6 address>

Delete a specified SIP server address:

delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-address <IPv6 address>

Show specified SIP server addresses:

show service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-address

By FQDN

A name for SIP server can be specified:

set service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-name <sip-server-name>

Delete a specified SIP server name:

delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-name <sip-server-name>

Show specified SIP server names:

show service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-name

Simple Network Time Protocol (SNTP) server address for DHCPv6 clients

A SNTP server address can be specified for DHCPv6 clients:

set service dhcpv6-server shared-network-name <name> subnet <ipv6net> sntp-server-address <IPv6 address>

Delete a specified SNTP server address:

delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> sntp-server-address <IPv6 address>

Show specified SNTP server addresses:

show service dhcpv6-server shared-network-name <name> subnet <ipv6net> sntp-server-address

DHCPv6 address pools

DHCPv6 address pools must be configured for the system to act as a DHCPv6 server. The following example describes a common scenario.

Example 1: DHCPv6 address pool

A shared network named NET1 serves subnet 2001:db8:100::/64 which is connected to eth1, a DNS server at 2001:db8:111::111 is used for name services. The range of the address pool shall be ::100 through ::199. The lease time will be left at the default value which is 24 hours.

set service dhcpv6-server shared-network-name NET1 subnet 2001:db8:100::/64 address-range start 2001:db8:100::100 stop 2001:db8:100::199
set service dhcpv6-server shared-network-name NET1 subnet 2001:db8:100::/64 name-server 2001:db8:111::111

Commit the changes and show the configuration:

commit
show service dhcpv6-server
    shared-network-name NET1 {
        subnet 2001:db8:100::/64 {
           address-range {
              start 2001:db8:100::100 {
                 stop 2001:db8:100::199
              }
           }
           name-server 2001:db8:111::111
        }
    }

Static mappings

In order to map specific IPv6 addresses to specific hosts static mappings can be created. The following example explains the process.

Example 1: Static IPv6 MAC-based mapping

IPv6 address 2001:db8:100::101 shall be statically mapped to a device with MAC address 00:15:c5:b7:5e:23, this host-specific mapping shall be named client1.

Note

The MAC address identifier is defined by the last 4 byte of the MAC address.

set service dhcpv6-server shared-network-name NET1 subnet 2001:db8:100::/64 static-mapping client1 ipv6-address 2001:db8:100::101
set service dhcpv6-server shared-network-name NET1 subnet 2001:db8:100::/64 static-mapping client1 identifier c5b75e23

Commit the changes and show the configuration:

show service dhcp-server shared-network-name NET1
   shared-network-name NET1 {
       subnet 2001:db8:100::/64 {
          name-server 2001:db8:111::111
          address-range {
              start 2001:db8:100::100 {
                 stop 2001:db8:100::199 {
              }
          }
          static-mapping client1 {
             ipv6-address 2001:db8:100::101
             identifier c5b75e23
          }
       }
    }