On Tue, Mar 29, 2022 at 09:53:56AM +0200, Laurent CARON wrote:
> Hi,
>
> I'm happily running several OpenBGPd routers (Openbsd 7.0).
>
> After having applied the folloxing filters (to blackhole traffic from
> certain countries):
>
> include "/etc/bgpd/deny-asn.ru.bgpd"
> include "/etc/bgpd/deny-asn.by.bgpd"
> include "/etc/bgpd/deny-asn.ua.bgpd"
>
>
> # head /etc/bgpd/deny-asn.ru.bgpd
> match from any AS 2148 set { localpref 250 nexthop blackhole }
> match from any AS 2585 set { localpref 250 nexthop blackhole }
> match from any AS 2587 set { localpref 250 nexthop blackhole }
> match from any AS 2599 set { localpref 250 nexthop blackhole }
> match from any AS 2766 set { localpref 250 nexthop blackhole }
> match from any AS 2848 set { localpref 250 nexthop blackhole }
> match from any AS 2854 set { localpref 250 nexthop blackhole }
> match from any AS 2875 set { localpref 250 nexthop blackhole }
> match from any AS 2878 set { localpref 250 nexthop blackhole }
> match from any AS 2895 set { localpref 250 nexthop blackhole }
>
You should really use as-set for this:
as-set ru-set { 2148 2585 2587 ... }
And also not match any (at least I think you don't really want that to
match on ibgp sessions):
match from ebgp AS as-set ru-set set { localpref 250 nexthop blackhole }
If done right you can replace all your rules by one single one.
--
:wq Claudio
