Filtering question
Alarig Le Lay
alarig at swordarmor.fr
Mon Mar 20 16:14:14 CET 2017
Hi,
I have this configuration:
function bgp_filter_customer_in (prefix customer_prefix) {
if ! (net ~ customer_prefix) then return false;
else return true;
}
template bgp PEERS {
local as myasn;
import keep filtered;
import all;
export all;
import limit 100 action restart;
rs client;
source address 2001:7f8:b1::1;
}
filter bgp_filter_grifon_nominoe_in {
if (bgp_filter_customer_in([ 2a00:5884::/32, 2001:678:3cc::/48 ]))
then {
accept;
} else {
reject "Prefix filtered for Grifon";
}
}
protocol bgp bgp_grifon_nominoe from PEERS {
description "Grifon nominoe";
neighbor 2001:7f8:b1::a as 204092;
import filter bgp_filter_grifon_nominoe_in;
}
But the two announced prefixes are filtered:
bird> show route filtered protocol bgp_grifon_nominoe
2a00:5884::/32 via 2001:7f8:b1::a on eth2 [bgp_grifon_nominoe 16:05:53] (100) [AS204092i]
2001:678:3cc::/48 via 2001:7f8:b1::a on eth2 [bgp_grifon_nominoe 16:05:53] (100) [AS206155i]
If I just pass one prefix in the filter, this prefix is accepted, so I
don’t understand why they are filtered with this configuration. Plus, I
used the same syntax for the IPv4 prefixes and it works.
I’m using bird 1.6.3.
Thanks for your advices,
--
alarig
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