dhcpv6 default gateway

[waranty92]

I have an issue with dhcpv6 this is configuration of /etc/dhcp/dhcpd6.conf file.

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default-lease-time 2592000;
preferred-lifetime 604800;
option dhcp-renewal-time 3600;
option dhcp-rebinding-time 7200;
allow leasequery;
option dhcp6.info-refresh-time 21600;



subnet6 2000::/64 {
range6 2000::10 2000::100;
option dhcp6.name-servers 2000::1;
}

this is interface configuration

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TYPE=Ethernet
BOOTPROTO=none
DEFROUTE=yes
NM_CONTROLLED=no
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=enp6s0
UUID=5d43c626-514d-4b36-85e6-6465a6701gf3
DEVICE=enp6s0
ONBOOT=yes
IPV6ADDR=2000::1/64
PEERDNS=yes
PEERROUTES=yes

DHCPv6 clients get ip and DNS information but are not getting default gateway ip.

[TrevorH]

Shouldn't your dhcp config have the default gw in it for it to send out?

[waranty92]

I could not find such option for dhcpv6 I think gateway information should be advertised with ipv6 router advertisement ICMP message not by dhcp server.

[jlehtone]

I could not find such option for dhcpv6 I think gateway information should be advertised with ipv6 router advertisement ICMP message not by dhcp server.

Correct.
More on that:
https://community.infoblox.com/t5/IPv6- ... /ba-p/3416
https://www.edge-cloud.net/2013/08/07/i ... t-gateway/
(The latter has a "Hall of shame".)

Anyway, do we agree that dhcpd6 is not the problem and you should ask what your router is configured to do?

[waranty92]

this router should be gateway of that network so it need to introduce itself by RA-s, how should I make it do so

[avij]

As an aside, I'm not sure if your 2000::/64 address was merely censored to hide your actual IPv6 address or if you are actually using that address. Please consider using unique local addresses instead if you can't use globally routable IPv6 addresses.

For advertising your server as a router, you will need to install and run radvd. For reference, here's my /etc/radvd.conf:

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interface eth0
{
	AdvSendAdvert on;
	MinRtrAdvInterval 30;
	MaxRtrAdvInterval 100;
	prefix 2001:2003:xxxx:xxxx::/64
	{
		AdvOnLink on;
		AdvAutonomous on;
		AdvRouterAddr off;
	};

};

[waranty92]

thank you radvd worked properly for me