Date: Wed, 14 Jun 2023 10:56:57 +0100 From: Alexander Chernikov <melifaro@FreeBSD.org> To: Benoit Chesneau <benoitc@enki-multimedia.eu> Cc: "freebsd-net@FreeBSD.org" <freebsd-net@freebsd.org> Subject: Re: can't add a /24 blackhole route with a /32 loopback Message-ID: <0C23EFD2-1535-46B0-9E69-93D58B376CC3@FreeBSD.org> In-Reply-To: <5747CC08-6903-4E2F-B0A5-D0CAB08F8165@FreeBSD.org> References: <9Jh8lSg93tjEc0-UEU3MQkGuQc7R9Aht0NBt4kEr6-wtgMdf673nws_jGaHelYwz0U78ik2BM4WLUca2JZAjrX-WSbP5QS4rsvoBHZo_JZo=@enki-multimedia.eu> <4DF565CC-D8AE-4F35-A7CF-7ED5AAD27B49@FreeBSD.org> <t_gT66nRcCT4fte7HbEMcM6J2spH-rEGFNYtZqX0GsUlxW4R5_pEVx3ZqtAwphKT4UBZsGZKX9gxeym1SKdc5GmceXGy1rRYEnSU1X6-_8c=@enki-multimedia.eu> <sgx1BljfJfV-Bn0PlfJ0va7yWHE9QraHpTjPBB6jlJWq4aehFwihem8C8f3ikkjvdEGIYY15S3ppTkQpWDfR3LDi_IKewBg7XQ1v9_u3SC4=@enki-multimedia.eu> <5747CC08-6903-4E2F-B0A5-D0CAB08F8165@FreeBSD.org>
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> On 14 Jun 2023, at 10:42, Alexander Chernikov <melifaro@freebsd.org> wrote: > > > >> On 14 Jun 2023, at 10:06, Benoit Chesneau <benoitc@enki-multimedia.eu> wrote: >> >> I forgot oto add the error message , sorry. >> >> When I try to set the theblackhole flag I get the following error: >> >> ``` >> route: writing to routing socket: Operation not supported >> change net 1.1.1.0 fib 0: Operation not supported >> ``` This looks like a route change request. Could you share the command as well? > Interesting. Could you also share full ifconfig output or at least ifconfig for each of the loopbacks? > If the output contains something you’re not comfortable sharing in the ML, you could consider sending it directly to my email. >>> 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 ^^ I see both the blackhole route and the loopback /32 here. 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` >> >> >> ------- Original Message ------- >> On Wednesday, June 14th, 2023 at 10:38, Benoit Chesneau <benoitc@enki-multimedia.eu> wrote: >> >> >>> 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: class=0x028000 rev=0x00 hdr=0x00 vendor=0x15b3 device=0x1007 subvendor=0x103c subdevice=0x22f3 >>> vendor = 'Mellanox Technologies' >>> device = 'MT27520 Family [ConnectX-3 Pro]' >>> class = network >>> Corrected = Advisory Non-Fatal Error >>> >>> >>> >>> Hope it helps, >>> >>> >>> Benoît >>> ------- Original Message ------- >>> On Wednesday, June 14th, 2023 at 10:29, Alexander Chernikov melifaro@FreeBSD.org wrote: >>> >>> >>> >>>>> On 14 Jun 2023, at 07:05, Benoit Chesneau benoitc@enki-multimedia.eu wrote: >>>>> >>>>> Hi, >>>>> >>>>> 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. >>>> >>>> Could you add a bit more context? >>>> What is the FreeBSD version (uname -srm)? >>>> What does 'route add 1.1.1.0/24 -blackhole’ show? >>>> Could you also share netstat -4rnW and ifconfig output (maybe privately)? >>>> >>>>> 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 what would be the other way to do it? >>>>> >>>>> Benoît >
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