Part of bird.conf ... filter export_default_1 { if net ~ [ 0.0.0.0/0 ] then accept; reject; } filter export_default_2 { if net ~ 0.0.0.0/0 then accept; reject; } filter export_net_1 { if net ~ [ 12.12.12.12/30 ] then accept; reject; } filter export_net_2 { if net ~ 12.12.12.12/30 then accept; reject; } bird> show route filter export_net_1 12.12.12.12/30 via 10.10.1.3 on eth1.550 [myospf 2010-05-08 18:54:23] * E2 (150/10/20) [10.10.1.3] bird> show route filter export_net_2 12.12.12.12/30 via 10.10.1.3 on eth1.550 [myospf 2010-05-08 18:54:23] * E2 (150/10/20) [10.10.1.3] bird> show route filter export_default_1 0.0.0.0/0 via 93.191.9.205 on eth2.701 [static1 2010-05-09 16:31:10] * (254) via 93.191.9.205 on eth2.701 [bgpfiord 2010-05-08 18:54:21] (100) [AS28917i] via 82.138.44.129 on eth2.51 [bgpcomcor 2010-05-08 18:54:15] (100) [AS8732i] bird> show route filter export_default_2 0.0.0.0/0 via 93.191.9.205 on eth2.701 [static1 2010-05-09 16:31:10] * (254) via 93.191.9.205 on eth2.701 [bgpfiord 2010-05-08 18:54:21] (100) [AS28917i] via 82.138.44.129 on eth2.51 [bgpcomcor 2010-05-08 18:54:15] (100) [AS8732i] 12.12.12.12/30 via 10.10.1.3 on eth1.550 [myospf 2010-05-08 18:54:23] * E2 (150/10/20) [10.10.1.3] 208.0.208.0/22 via 93.191.9.205 on eth2.701 [bgpfiord 2010-05-08 18:54:41] * (100) [AS26759i] via 82.138.44.129 on eth2.51 [bgpcomcor 2010-05-08 18:54:24] (100) [AS26759i] 40.0.40.0/24 via 93.191.9.205 on eth2.701 [bgpfiord 2010-05-08 18:55:07] * (100) [AS4249i] via 82.138.44.129 on eth2.51 [bgpcomcor 2010-05-08 18:54:49] (100) [AS4249i] 69.0.69.0/24 via 93.191.9.205 on eth2.701 [bgpfiord 2010-05-08 18:55:20] * (100) [AS19374i] via 82.138.44.129 on eth2.51 [bgpcomcor 2010-05-08 18:54:48] (100) [AS19374i] ... more output 8.2.0.0/24 via 93.191.9.205 on eth2.701 [bgpfiord 2010-05-08 18:55:10] * (100) [AS20473i] via 82.138.44.129 on eth2.51 [bgpcomcor 2010-05-08 18:54:25] (100) [AS20473i] 200.2.192.0/19 via 93.191.9.205 on eth2.701 [bgpfiord 2010-05-08 18:55:22] * (100) [AS10778i] via 82.138.44.129 on eth2.51 [bgpcomcor 2010-05-08 18:54:26] (100) [AS10778i] 72.2.64.0/19 via 93.191.9.205 on eth2.701 [bgpfiord 2010-05-08 18:55:08] * (100) [AS19009i] via 82.138.44.129 on eth2.51 [bgpcomcor 2010-05-08 18:54:28] (100) [AS19009i] 69.2.77.0/24 via 93.191.9.205 on eth2.701 [bgpfiord 2010-05-08 18:54:52] * (100) [AS15105i] via 82.138.44.129 on eth2.51 [bgpcomcor 2010-05-08 18:55:07] (100) [AS15105i] --More-- ... more output Why filters export_net_1 and export_net_2 work equally, and/but filters export_default_1 and export_default_1 on a miscellaneous? Why the filter export_default_2 "does not work" also as the filter export_net_2 works? Vladislav Grishin