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14.6. Configuring the radvd daemon for IPv6 routers
The router advertisement daemon (
radvd) sends router advertisement messages which are required for IPv6 stateless autoconfiguration. This allows users to automatically configure their addresses, settings, routes and choose a default router based on these advertisements. To configure the radvd daemon:
- Install the
radvddaemon:~]# sudo yum install radvd - Set up the
/etc/radvd.conffile. For example:interface enp1s0 { AdvSendAdvert on; MinRtrAdvInterval 30; MaxRtrAdvInterval 100; prefix 2001:db8:1:0::/64 { AdvOnLink on; AdvAutonomous on; AdvRouterAddr off; }; };Note
If you want to additionally advertise DNS resolvers along with the router advertisements, add theRDNSS <ip> <ip> <ip> { };option in the/etc/radvd.conffile. To configure a DHCPv6 service for your subnets, you can set theAdvManagedFlagto on, so the router advertisements allow clients to automatically obtain an IPv6 address when a DHCPv6 service is available. For more details on configuring the DHCPv6 service, see Section 14.5, “DHCP for IPv6 (DHCPv6)” - Enable the
radvddaemon:~]# sudo systemctl enable radvd.service - Start the
radvddaemon immediately:~]# sudo systemctl start radvd.service
To display the content of router advertisement packages and the configured values sent by the
radvd daemon, use the radvdump command:
~]# radvdump
Router advertisement from fe80::280:c8ff:feb9:cef9 (hoplimit 255)
AdvCurHopLimit: 64
AdvManagedFlag: off
AdvOtherConfigFlag: off
AdvHomeAgentFlag: off
AdvReachableTime: 0
AdvRetransTimer: 0
Prefix 2002:0102:0304:f101::/64
AdvValidLifetime: 30
AdvPreferredLifetime: 20
AdvOnLink: off
AdvAutonomous: on
AdvRouterAddr: on
Prefix 2001:0db8:100:f101::/64
AdvValidLifetime: 2592000
AdvPreferredLifetime: 604800
AdvOnLink: on
AdvAutonomous: on
AdvRouterAddr: on
AdvSourceLLAddress: 00 80 12 34 56 78
For more information on the
radvd daemon, see the radvd(8), radvd.conf(5), radvdump(8) man pages.
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