Kernel protocol and IPv6 route issue with Bird 2.0

[Nigel Kukard]

Hi guys,

I'm having an issue where IPv6 routes from the kernel routing table
don't appear to end up in my t_kernel6 table. Despite the next-hop being
link-local and the interface being UP.

IPv4 routes I have no problem with, working as expected.

I must be doing something wrong on my side, if someone could kindly
point me in the right direction.


(the below is configuration I'm testing with, I have manually set the
MAC addresses and IP's for testing purposes within a LXC container so I
can test results across configuration changes)


Here is the snippet of config with...

   protocol device {
      description "Device protocol";
      scan time 10;
  };

  protocol kernel kernel4 {
      description "Kernel protocol for IPv4";
      metric 600;
      learn;
      ipv4 {
          table t_kernel4;
          export all;
          import all;
      };
  };
  protocol kernel kernel6 {
      description "Kernel protocol for IPv6";
      metric 600;
      learn;
      ipv6 {
          table t_kernel6;
          export all;
          import all;
      };
  };


Here is the error I'm getting in my logs and fc11::/64 is not being
shown in my t _kernel6 table...

2019-09-11 11:40:36.653 <ERR> KRT: Received route fc11::/64 with strange
next-hop fc10::2

The interface is however UP and fc10::2 is link local.


Here is the output of 'ip link'...  (eth1 is UP)

  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
mode DEFAULT group default qlen 1
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  2: eth0 at if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP mode DEFAULT group default qlen 1000
      link/ether 02:01:00:00:00:01 brd ff:ff:ff:ff:ff:ff link-netnsid 0
  4: *eth1*@if5: <BROADCAST,MULTICAST,UP,*LOWER_UP*> mtu 1500 qdisc
noqueue state *UP* mode DEFAULT group default qlen 1000
      link/ether 02:01:00:00:00:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0

Here is the output of 'ip -6 address'...

  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 state UNKNOWN qlen 1
      inet6 ::1/128 scope host
         valid_lft forever preferred_lft forever
  2: eth0 at if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
      inet6 fc00::1/64 scope global
         valid_lft forever preferred_lft forever
      inet6 fe80::1:ff:fe00:1/64 scope link
         valid_lft forever preferred_lft forever
  4: eth1 at if5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
      inet6 *fc10::1/64* scope global
         valid_lft forever preferred_lft forever
      inet6 fe80::1:ff:fe00:2/64 scope link
         valid_lft forever preferred_lft forever

Here is the kernel routing table 'ip -6 route'...

 fc00::/64 dev eth0 proto kernel metric 256 pref medium
  fc10::/64 dev eth1 proto kernel metric 256 pref medium
  *fc11::/64 via fc10::2 dev eth1 metric 1024 pref medium*
  fe80::/64 dev eth0 proto kernel metric 256 pref medium
  fe80::/64 dev eth1 proto kernel metric 256 pref medium


Kind Regards
-N

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