Date: Wed, 14 Jun 2023 08:38:28 +0000 From: Benoit Chesneau <benoitc@enki-multimedia.eu> To: Alexander Chernikov <melifaro@FreeBSD.org> Cc: "freebsd-net@FreeBSD.org" <freebsd-net@freebsd.org> Subject: Re: can't add a /24 blackhole route with a /32 loopback Message-ID: <t_gT66nRcCT4fte7HbEMcM6J2spH-rEGFNYtZqX0GsUlxW4R5_pEVx3ZqtAwphKT4UBZsGZKX9gxeym1SKdc5GmceXGy1rRYEnSU1X6-_8c=@enki-multimedia.eu> In-Reply-To: <4DF565CC-D8AE-4F35-A7CF-7ED5AAD27B49@FreeBSD.org> References: <9Jh8lSg93tjEc0-UEU3MQkGuQc7R9Aht0NBt4kEr6-wtgMdf673nws_jGaHelYwz0U78ik2BM4WLUca2JZAjrX-WSbP5QS4rsvoBHZo_JZo=@enki-multimedia.eu> <4DF565CC-D8AE-4F35-A7CF-7ED5AAD27B49@FreeBSD.org>
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Hi,
Thanks for your answer. I'm using Freebsd 13.2 latest version:
$ uname -srm
FreeBSD 13.2-RELEASE amd64
I edited the filtred result of the table since it has a full view:
netstat -4rnW |grep -e "1.1.1"
1.1.1.0/24 127.0.0.1 USB 14 16384 lo0
1.1.1.1 link#9 UHS 26 16384 lo1
1.1.1.2 10.3.1.1 UGH1 15 9000 vlan2212
1.1.1.2 10.3.1.1 UGHS 16 1500 vlan2212
1.1.1.2 10.3.1.1 UGHS 25 9000 vlan2212
Also I forgot to mention that the ethernet driver is MLX4EN(4):
mlx4_core0@pci0:8:0:0:=09class=3D0x028000 rev=3D0x00 hdr=3D0x00 vendor=3D0x=
15b3 device=3D0x1007 subvendor=3D0x103c subdevice=3D0x22f3
vendor =3D 'Mellanox Technologies'
device =3D 'MT27520 Family [ConnectX-3 Pro]'
class =3D network
Corrected =3D Advisory Non-Fatal Error
Hope it helps,
Beno=C3=AEt=20
------- Original Message -------
On Wednesday, June 14th, 2023 at 10:29, Alexander Chernikov <melifaro@FreeB=
SD.org> wrote:
> > On 14 Jun 2023, at 07:05, Benoit Chesneau benoitc@enki-multimedia.eu wr=
ote:
> >=20
> > Hi,
> >=20
> > When I setup a loopback to a /32 , I can add a /24 as a blackhole route=
anymore. I can only create a /24 attached to this looopback. Ie.
>=20
> Could you add a bit more context?
> What is the FreeBSD version (uname -srm)?
> What does 'route add 1.1.1.0/24 -blackhole=E2=80=99 show?
> Could you also share netstat -4rnW and ifconfig output (maybe privately)?
>=20
> > when `lo1` is set to `1.1.1.1/32` I cant create a blackhole route to `1=
.1.1.0/24` using the command : `route add 1.1.1.0/24 -blackhole` . Is there=
any reason for it? The idea is to be able to advertise the prefix `1.1.1.0=
/24` via BGP (bird) and use 1.1.1.1/32` as a loopback distributed to other =
nodes using OSPF. I can probably make the loopback a /24 used by bird but w=
hat would be the other way to do it?
> >=20
> > Beno=C3=AEt
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