annoying log, received route with strange next hop, Netlink File exists

[Maria Matejka]

Hello,

the first message says that `10.0.0.1` is either your own address or it
isn't considered reachable from what we can see on the interfaces.

To find out what causes the `File exists` message, we'll need you to
allow `debug all;` inside the `ipv4` block of your `protocol kernel`
and send us a log snippet around this message when it appears next time.
Otherwise, we know nothing. It is possibly BIRD trying to export a
colliding route.

Maybe, but that's a wild guess, you're running OpenBSD (?) and you have
another route inside BIRD for xx.yy.zz.0/24. If that's right, there is
quite a lot additional questions about what you are trying to achieve
and whether this is a good or bad state. But I'll keep them for later.

Have a nice day! 
Maria

On Wed, Jan 08, 2025 at 08:53:45PM +0000, LIU Chris via Bird-users wrote:

> ```
> Classified as: {Hitachi Rail - Public}
> 
> Basically configured bird as below
> 
> protocol device  {
>             scan time 10;
> }
> 
> protocol kernel {
>          scan time 10;
>           learn;
>           ipv4  {
>                        export filter XXXX;
>           }
> }
> 
> bgp and bfd are established, everything is fine.
> But only have some annoying log:
> 
> Every 10 seconds to print below bird log, assuming this is caused by kernel protocol scan time 10.  But why Netlink : File exists, it would write to kernel ???
> KRT:     Received route xx.yy.zz.0/24 with strange next-hop 10.0.0.1
> Netlink: File exists
> 
> Chris
> 
> 
> 
> {Hitachi Rail - Public}
> ```

-- 
Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.
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