OSPFv3 using Link-Local instead of Global

Stefan Schultheis (home) stefan at schultheis.at
Sun Apr 22 08:30:21 CEST 2018


Hi,

it's not a problem as everything works, but I see that OSPFv3 does
adjecencies via Link-Local addresses (fe80) instead of global routed ones:

$ birdc6 show ospf neigh
BIRD 1.6.3 ready.
ospf1:
Router ID       Pri         State         DTime    Interface  Router IP
78.xxx.yyy.37      1    Full/PtP      00:17    enp1s0.503
fe80::202:c9ff:fe52:2776
78.xxx.yyy.36      1    Full/PtP      00:19    enp1s0.508
fe80::202:c9ff:fe10:f084

Also, routing in Kernel is using link local address:
$ netstat -nr -A inet6 | grep 2a00:11c0
2a00:11c0:47:3::2a/127         fe80::202:c9ff:fe52:2776   UG   1024 2    50
enp1s0.503

Does anyone have a hint on how to easily make it use the global scope IPs
instead of Link Local? I don't want to explicitely name IPs in the config
if this can be avoided...

The config file is as simple as can be:
protocol ospf {
        import all;
        export all;

        area 0 {
                interface "lo" {
                        cost 5;
                        hello 5; retransmit 2; wait 10; dead 20;
                };

                interface "enp1s0.503" {
                        cost 5;
                        type pointopoint;
                        hello 5; retransmit 2; wait 10; dead 20;
                };

                interface "enp1s0.508" {
                        cost 1000;
                        type pointopoint;
                        hello 5; retransmit 2; wait 10; dead 20;
                };
        };
}

Thank you!

LgS
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