Re: can't add a /24 blackhole route with a /32 loopback
- In reply to: Alexander Chernikov : "Re: can't add a /24 blackhole route with a /32 loopback"
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Date: Wed, 14 Jun 2023 10:40:43 UTC
------- Original Message ------- On Wednesday, June 14th, 2023 at 12:36, Alexander Chernikov <melifaro@FreeBSD.org> wrote: > > On 14 Jun 2023, at 11:26, Benoit Chesneau benoitc@enki-multimedia.eu wrote: > > > > I found an interresting log in dmesg (see below). Not sure how it can happens. > > > > Could it be related to the usage of bird? > > > > The log: > > > > `[rtsock] fill_blackholeinfo: PID 72835: Unable to find ifa for blackhole/reject nhop [rtsock] fill_blackholeinfo: PID 72837: Unable to find ifa for blackhole/reject nhop [rtsock] fill_blackholeinfo: PID 72838: Unable to find ifa for blackhole/reject nhop [rtsock] fill_blackholeinfo: PID 72847: Unable to find ifa for blackhole/reject nhop [rtsock] fill_blackholeinfo: PID 72854: Unable to find ifa for blackhole/reject nhop [rtsock] fill_blackholeinfo: PID 72860: Unable to find ifa for blackhole/reject nhop` > > Not sure if that’s bird (it shouldn’t be the case), but that’s the reason. > Every route requires some preferred source interface address by convention, as the stack wants to see some non-NULL value. > For the blackhole routes, this source address is the first address from lo0 interface. > In your case, `lo0` doesn’t contain any IPv4 addresses (typically there should be 127.0.0.1 there). > Is there any reason for not having 127.0.0.1 ? > oh! good catch. When localhost added it works, indeed... Thanks! There ws no reason the localhost was not set. I am not sure why it has been not set. I will investigate. Benoît