radvd.conf syntax error - won't start

motific

radvd does not start on startup and if I try to start it I getting the an error in the syslog -

/status_services.php: The command '/usr/local/sbin/radvd -p /var/run/radvd.pid -C /var/etc/radvd.conf -m syslog' returned exit code '1', the output was '/var/etc/radvd.conf:11 error: syntax error'

The radvd.conf file is auto-generated and I haven't altered it though any changes should get wiped. It is:-

# Automatically Generated, do not edit
# Generated for DHCPv6 Server lan
interface re1 {
	AdvSendAdvert on;
	MinRtrAdvInterval 5;
	MaxRtrAdvInterval 20;
	AdvLinkMTU 1500;
	AdvDefaultPreference medium;
	AdvManagedFlag on;
	AdvOtherConfigFlag on;
	prefix ::101:101/128 {  # error is on this line?
		DeprecatePrefix on;
		AdvOnLink on;
		AdvAutonomous on;
		AdvRouterAddr on;
		AdvValidLifetime 86400;
		AdvPreferredLifetime 14400;
	};
	route ::/0 {
		AdvRoutePreference medium;
		RemoveRoute on;
	};
	RDNSS ::10.10.10.1 { };
	DNSSL lan  { };
};

I'm on 2.4.5 dev snapshots (build 2.4.5.a.20190213.0609) so if it's related to that then let me know.

jimp

You shouldn't be getting a /128 prefix delegated. That isn't valid to use for SLAAC advertising and so on, it has to be a /64. That's also not a complete prefix specification.

Is that coming from upstream or somewhere in your configuration?

motific

I haven't specified it anywhere so I presume it is coming from upstream, though I'd need some guidance on how to check it properly.

jimp

Set Debug in the DHCP6 Client Configuration on WAN as well, then check the logs (main system log, routing log, etc) to see what shows up.