Re: can't add a /24 blackhole route with a /32 loopback

From: Benoit Chesneau <benoitc_at_enki-multimedia.eu>
Date: Wed, 14 Jun 2023 10:21:12 UTC
disreguard the part containing

```
# route -n get 1.1.1.1/32
   route to: 1.1.1.1
destination: 1.1.1.1
    gateway: 10.3.1.2
        fib: 0
  interface: vlan212
      flags: <UP,GATEWAY,HOST,DONE,PROTO1>
 recvpipe  sendpipe  ssthresh  rtt,msec    mtu        weight    expire
       0         0         0         0      9000         1         0

```

It was actually a bad edit and should have been 1.1.1.2 there. This specific route is created dynamically with bird.

Benoît Chesneau, Enki Multimedia
—
t. +33608655490 

Sent with Proton Mail secure email.

------- Original Message -------
On Wednesday, June 14th, 2023 at 12:18, Benoit Chesneau <benoitc@enki-multimedia.eu> wrote:


> 
> ------- Original Message -------
> On Wednesday, June 14th, 2023 at 11:56, Alexander Chernikov melifaro@FreeBSD.org wrote:
> 
> > Could you try:
> > 1) removing the 1.1.1.0/24 route
> > 2) removing the 1.1.1.1/32 from the lo1
> > 3) provide the output for `route -n get 1.1.1.0/24`
> > 4) provide the output for `route -n get 1.1.1.1/32`
> > 5) assign 1.1.1.1/32 to lo1
> > 6) provide the output for `route -n get 1.1.1.0/24`
> > 7) provide the output for `route -n get 1.1.1.1/32`
> > 8) provide the output for `route add -net 1.1.1.0/24 -blackhole`
> 
> 
> Find the result below. Such thing worked on another machine, I am not sure why. No obvious logs.
> 
> ```
> # route -n get 1.1.1.0/24
> route to: 1.1.1.0
> destination: 1.1.1.0
> mask: 255.255.255.0
> fib: 0
> interface: lo1
> flags: <UP,DONE,STATIC>
> 
> recvpipe sendpipe ssthresh rtt,msec mtu weight expire
> 0 0 0 0 16384 1 0
> # route -n get 1.1.1.1/32
> route to: 1.1.1.1
> destination: 1.1.1.1
> gateway: 10.3.1.2
> fib: 0
> interface: vlan212
> flags: <UP,GATEWAY,HOST,DONE,PROTO1>
> 
> recvpipe sendpipe ssthresh rtt,msec mtu weight expire
> 0 0 0 0 9000 1 0
> # route delete 1.1.1.0/24
> delete net 1.1.1.0
> # route -n get 1.1.1.1/32
> route: route has not been found
> # ifconfig lo1 inet 1.1.1.1/32
> # route -n get 1.1.1.1/32
> route to: 1.1.1.1
> destination: 1.1.1.1
> fib: 0
> interface: lo1
> flags: <UP,HOST,DONE,PINNED>
> 
> recvpipe sendpipe ssthresh rtt,msec mtu weight expire
> 0 0 0 0 16384 1 0
> # route add -net 1.1.1.0/24 -blackhole
> route: writing to routing socket: Operation not supported
> add net 1.1.1.0 fib 0: Operation not supported
> # route -n get 1.1.1.0/24
> route: route has not been found
> ```