Le mercredi 06 juin 2018 à 13:55 +0200, Bastien Durel a écrit :
> Hello,
>
> I run rtadvd on a router, which also run ospfd (on 6.3).
>
> rtadvd runs with static config (noifprefix):
> fremen# cat /etc/rtadvd.conf
> em0:\
> :rdnss="2a01:e35:8aea:ac42::10":\
> :dnssl="geekwu.org":\
> :addr0="2001:41d0:fe4b:ec21::":\
> :addr1="2a01:0e35:8aea:ac41::":\
> :noifprefix:
> em1:\
> :rdnss="2a01:e35:8aea:ac42::10":\
> :dnssl="geekwu.org":\
> :addr0="2a01:e35:8aea:ac42::":\
> :addr1="2001:41d0:fe4b:ec42::":\
> :noifprefix:
> em5:\
> :rdnss="2001:41d0:fe4b:ec42::10":\
> :dnssl="geekwu.org":\
> :addr0="2a01:e35:8aea:ac43::":\
> :noifprefix:
> em4:\
> :rdnss="2001:41d0:fe4b:ec42::10":\
> :dnssl="geekwu.org":\
> :addr="2001:41d0:fe4b:ecff::":\
> :noifprefix:
>
> if an ospf neighbour start advertising a new network (in my case
> 2001:41d0:fe4b:ecf1::/64), a route is inserted in the kernel:
>
> fremen# route -n show -inet6|grep ecf1
> 2001:41d0:fe4b:ecf1::/64 fe80::225:22ff:fe1e:bb7%em1 UG
> 0 594 - 32 em1
> but rtadvd starts advertising it on the link with the said neighbour.
>
> I get this from radvdump running on a Linux host on this link:
> #
> # radvd configuration generated by radvdump 2.17
> # based on Router Advertisement from fe80::8621:df60:6d70:8da
> # received by interface enp2s0
> #
>
> interface enp2s0
> {
> AdvSendAdvert on;
> # Note: {Min,Max}RtrAdvInterval cannot be obtained with
> radvdump
> AdvManagedFlag off;
> AdvOtherConfigFlag off;
> AdvReachableTime 0;
> AdvRetransTimer 0;
> AdvCurHopLimit 64;
> AdvDefaultLifetime 1800;
> AdvHomeAgentFlag off;
> AdvDefaultPreference medium;
> AdvSourceLLAddress on;
>
> prefix 2a01:e35:8aea:ac42::/64
> {
> AdvValidLifetime 2592000;
> AdvPreferredLifetime 604800;
> AdvOnLink on;
> AdvAutonomous on;
> AdvRouterAddr off;
> }; # End of prefix definition
>
>
> prefix 2001:41d0:fe4b:ec42::/64
> {
> AdvValidLifetime 2592000;
> AdvPreferredLifetime 604800;
> AdvOnLink on;
> AdvAutonomous on;
> AdvRouterAddr off;
> }; # End of prefix definition
>
>
> prefix 2001:41d0:fe4b:ecf1::/64
> {
> AdvValidLifetime 2592000;
> AdvPreferredLifetime 604800;
> AdvOnLink on;
> AdvAutonomous on;
> AdvRouterAddr off;
> }; # End of prefix definition
>
>
> RDNSS 2a01:e35:8aea:ac42::10
> {
> AdvRDNSSLifetime 900;
> }; # End of RDNSS definition
>
>
> DNSSL geekwu.org
> {
> AdvDNSSLLifetime 900;
> }; # End of DNSSL definition
>
> }; # End of interface definition
>
> Why does rtadvd start advertising this prefix ?
> If I withdraw the prefix from ospf, rtadvd stops advertising it.
>
BTW, radvd emits this log when the prefix is inserted into ospf
rtadvd[33784]: prefix 2001:41d0:fe4b:ecf1::/64 from fe80::225:22ff:fe1e:bb7 on
em1 is not in our list
--
Bastien
