radvd only sends a router lifetime of 0

[Colum31]

Hello,

with my config:

interface ipoe.666 
{
	
    AdvDefaultLifetime 1800;
    MaxRtrAdvInterval 60;
    MinRtrAdvInterval 30;
    AdvSendAdvert on;
    AdvRASolicitedUnicast on;
	
    AdvSendAdvert on;
    AdvManagedFlag on;
    AdvOtherConfigFlag on;

    prefix 2001:db8:1234:8000::/64
    {
        AdvOnLink on;
        AdvAutonomous off;
        AdvRouterAddr off;
    };
};

all RA have a router lifetime of 0. It does not matter which values I plug into AdvDefaultLifetime.

Is this a bug or am I missing something?

I have built radvd from source:

Version: 2.19

Compiled in settings:
default config file "/etc/radvd.conf"
default pidfile "/var/run/radvd.pid"
default logfile "/var/log/radvd.log"
default syslog facility 24

[robbat2]

Can you please include the output of ip -6 addr (mask out the first 4-6 octets of your non-fe80 addresses for privacy.

Also, are you sure that /proc/sys/net/ipv6/conf/all/forwarding or per-interface variable is enabled?

[Neustradamus]

@Colum31: Have you seen the @robbat2 comment from 2023-03-01?

[robbat2]

Cannot reproduce. I suspect your system may have a dynamic address with a lower lifetime, causing what you observed.

Using your config, minor tweaks to dummy0 & 2001:db8::/64:

tcpdump: listening on dummy0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
e2:6a:7a:f5:2c:42 > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 110: (flowlabel 0x417d0, hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::e06a:7aff:fef5:2c42 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56
	hop limit 64, Flags [managed, other stateful], pref medium, router lifetime 1800s, reachable time 0ms, retrans timer 0ms
	   prefix info option (3), length 32 (4): 2001:db8::/64, Flags [onlink], valid time 86400s, pref. time 14400s
	     0x0000:  4080 0001 5180 0000 3840 0000 0000 2001
	     0x0010:  0db8 0000 0000 0000 0000 0000 0000
	   source link-address option (1), length 8 (1): e2:6a:7a:f5:2c:42
	     0x0000:  e26a 7af5 2c42