On 25/02/2023 16:19, Daniel via Dnsmasq-discuss wrote:
Hi,
I'm banging my head with a KVM VM only ipv6 who can't get stateless
dhcpv6 address. Always getting messages like shown below:
Configuration being
enable-ra
ra-param=lan,high,60,60
dhcp-range=set:computer6,::0,::ffff,constructor:lan,ra-stateless,ra-names,1h
dhcp-option=tag:computer6,option6:3,fd99:1234:beef:cafe::2
dhcp-option=tag:computer6,option6:6,fd99:1234:beef:cafe::1
dhcp-option=tag:computer6,option6:ntp-server,fd99:1234:beef:cafe::2
Starting dnsmasq I get in logs
Feb 25 16:52:38 dnsmasq[211076]: demarré, version 2.85 (taille de cache
2048)
[...]
Feb 25 16:52:38 dnsmasq-dhcp[211076]: DHCPv6 sans état (stateless) sur lan
Feb 25 16:52:38 dnsmasq-dhcp[211076]: noms IPv6 dérivés de DHCPv4 sur lan
Feb 25 16:52:38 dnsmasq-dhcp[211076]: annonces de routeurs sur lan
Feb 25 16:52:38 dnsmasq-dhcp[211076]: annonces de routeur IPv6 activées
[...]
Feb 25 16:53:09 dnsmasq-dhcp[211076]: pas de plage d'adresse disponible
pour la requête DHCPv6 via lan
or configuration being
enable-ra
ra-param=lan,high,60,60
dhcp-range=set:computer6,fd99:1234:beef:cafe::0,fd99:1234:beef:cafe::ffff,slaac,ra-names,1h
dhcp-option=tag:computer6,option6:3,fd99:1234:beef:cafe::2
dhcp-option=tag:computer6,option6:6,fd99:1234:beef:cafe::1
dhcp-option=tag:computer6,option6:ntp-server,fd99:1234:beef:cafe::2
Feb 25 17:10:32 dnsmasq[214786]: demarré, version 2.85 (taille de cache
2048)
[...]
Feb 25 17:10:32 dnsmasq-dhcp[214786]: DHCPv6, plage d'adresses IP
fd99:1234:beef:cafe:: -- fd99:1234:beef:cafe::ffff, durée de bail 1h
Feb 25 17:10:32 dnsmasq-dhcp[214786]: noms IPv6 dérivés de DHCPv4 sur
fd99:1234:beef:cafe::
Feb 25 17:10:32 dnsmasq-dhcp[214786]: annonces de routeurs sur
fd99:1234:beef:cafe::
Feb 25 17:10:32 dnsmasq-dhcp[214786]: annonces de routeur IPv6 activées
[...]
Feb 25 17:11:37 dnsmasq-dhcp[214786]: DHCPSOLICIT(lan)
00:01:00:01:27:b4:3b:4d:52:54:00:e5:33:8a
Feb 25 17:11:37 dnsmasq-dhcp[214786]: DHCPREPLY(lan)
00:01:00:01:27:b4:3b:4d:52:54:00:e5:33:8a pas d'adresse disponible
Interface lan is a bridge of eth0 if it matter.
Any clue on whats going on here ? Thanks for your support.
"Stateless" dhcpv6 means using DHCP just to get configuration
information, NOT allocating an address. The host is supposed to get its
addresses via the router advertisements and use the DHCP request just to
find DNS servers and other configuration. This all got a bit superseded
when the IETF started defining options on the RA packets for the common
configuration options.
TLDR; If you want your host to get an address via DHCPv6, don't
configure stateless DHCP.
Cheers,
Simon.
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