Hi! I have unnumbered config on a linux box. Something like below can be seen: 1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet 194.246.102.1/32 scope global lo 2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue link/ether 00:04:76:f7:cc:65 brd ff:ff:ff:ff:ff:ff inet 10.255.2.1/24 brd 10.255.2.255 scope link eth0 inet 194.246.102.1/32 scope global eth0 2: br1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue link/ether 00:04:76:f7:cc:65 brd ff:ff:ff:ff:ff:ff inet 10.25.1.80/24 brd 10.25.1.255 scope link eth1 inet 194.246.102.1/32 scope global eth1 3: br2: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue link/ether 00:04:76:f7:cc:65 brd ff:ff:ff:ff:ff:ff inet 10.255.1.1/24 brd 10.255.1.255 scope link eth2 inet 194.246.102.1/32 scope global eth2 In this case if a packet is sent farer than the connected network, the source address is the global (194.246.102.1) address. If packet is sent to the connected network, source address is link scope address. With this config bird does not work correctly. Bird selects the global scope (194.246.102.1/32) address as primary and sends OSPF hello with this source address to the connected net. I think the algoritm of the primary address selection is not correct, because if there is link scope address it must be selected. A router interacts with other routers on its connected network (except BGP). So I suggest a patch to correct this: --- tmp/bird-1.0.7/nest/iface.c Thu Aug 14 10:13:13 2003 +++ bird-1.0.7/nest/iface.c Tue Feb 24 18:51:37 2004 @@ -407,9 +407,10 @@ WALK_LIST(a, i->addrs) { - if (!(a->flags & IA_SECONDARY) && (!b || a->scope > b->scope)) - b = a; - a->flags &= ~IA_PRIMARY; + if (!(a->flags & IA_SECONDARY) + && (!b || ((a->scope < b->scope)&&(a->scope != SCOPE_HOST)) )) + b = a; + a->flags &= ~IA_PRIMARY; } res = (b != i->addr); i->addr = b; Best regards: Joseph -- Üdvözlettel: Sörös József Multip Kft. JS84-RIPE