August 2018 - Bird-users

bird 2 and vpn4 mpls
by Chris Herdt 08 Aug '18

08 Aug '18

Following the example at https://github.com/BIRD/bird/ blob/v2.0.2/doc/bird.conf.example2, I set up a simple bird config (see below). It is working, but I am not certain what the '---' in the table column of the output of `show protocols` means. I expected the column to display vpntab4. $ sudo /usr/local/sbin/birdc show protocols BIRD v2.0.2 ready. Name Proto Table State Since Info peer1 BGP --- up 17:14:48.474 Established The output of `show route count` shows that there are routes in table vpntab4: $ sudo /usr/local/sbin/birdc show route count BIRD v2.0.2 ready. 0 of 0 routes for 0 networks in table master4 0 of 0 routes for 0 networks in table master6 9581 of 9581 routes for 9581 networks in table vpntab4 Total: 9581 of 9581 routes for 9581 networks in 3 tables The contents of my bird.conf: log syslog { debug, trace, info, remote, warning, error, auth, fatal, bug }; log stderr all; router id 127.0.0.1; vpn4 table vpntab4; protocol bgp peer1 { local as 65321; neighbor 192.168.1.1 as 65321; hold time 180; vpn4 mpls { import all; }; } Thanks, -- Chris Herdt https://osric.com/chris/

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Bird 2 and device routes switch in kernel configuration section
by Julien Dessaux 06 Aug '18

06 Aug '18

Hello, I have found something odd will try testing bird 2 with some of my configurations. It seems that the "device routes on" in the kernel configuration section doesn't exist anymore. The documentation still references it in the introduction for the kernel section, but not in the detailed list of configuration entries : http://bird.network.cz/?get_doc&v=20&f=bird-6.html#ss6.6 . For reference, here it is also for bird 1.6 : http://bird.network.cz/?get_doc&v=16&f=bird-6.html#ss6.6 Is there any information as to how to port the "device routes on" behavior from bird 1.6 to bird 2? I use it to have bird learn routes that are push from an openvpn server I connect to, so that I can announce those to other servers. Best regards, -- Julien

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seemless configuration change
by Kurt Wauters 04 Aug '18

04 Aug '18

Hello, I've got BIRD running for v4 and v6 but i was wondering if there is a way to switch between configurations without shutting down bird in order to avoid BGP flaps. I basically add regularly neighbors to the RS and i don't want my allready active bgp sessions to flap. Initially i thought I would be able to load the new configuration files but he complains that there is already a process running. Anyone an idea? Kurt

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OpenVPN-Server as Bird-Router
by Dawid Kulesza 03 Aug '18

03 Aug '18

Hello, I have some issues runinng a few Bird-instances, where two border PC's are connected over a VPN-Connection. The image below shows the setting: clientA 192.168.30.2 (eth) |//|//192.168.30.1 (eth) routerA 192.168.21.5 (eth) |//|//192.168.21.1 (eth) clientB 10.29.0.8 (tun) |//|//10.29.0.1 (tun) Server 10.29.0.1 (tun) |//|//10.29.0.4 (tun) clientC 192.168.21.17 (eth) Now running route -n on ClientC gives following result: route -n (routes with metric 12 are set by bird) Destination Gateway Genmask Flags Metric Ref Use Iface 10.29.0.0 0.0.0.0 255.255.252.0 U 0 0 0 tun0 WWWWW 0.0.0.0 255.255.255.252 U 0 0 0 eth1 XXXXXXX 0.0.0.0 255.255.255.255 UH 1024 0 0 eth1 192.168.21.0 10.29.0.8 255.255.255.240 UG 12 0 0 tun0 192.168.21.16 0.0.0.0 255.255.255.240 U 0 0 0 eth0 192.168.30.0 10.29.0.8 255.255.255.240 UG 12 0 0 tun0 On Server: Ziel Router Genmask Flags Metric Ref Use Iface 192.168.21.16 10.29.0.4 255.255.255.240 UG 17 0 0 tun0 192.168.21.0 10.29.0.8 255.255.255.240 UG 17 0 0 tun0 192.168.30.0 10.29.0.8 255.255.255.240 UG 17 0 0 tun0 192.168.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.29.0.0 0.0.0.0 255.255.252.0 U 0 0 0 tun0 ZZZZZZZZ 0.0.0.0 255.255.0.0 U 1002 0 0 eth0 With /birdc show ospf neighbors / I can see on each router everyone else, so the initialization is done correctly but somehow data packages aren't transferred correctly. There are no invalid iptables rules nor any other firewall is set. Regards Dawid

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Newbie question about 'export' semantics
by Mark Petrovic 02 Aug '18

02 Aug '18

Hi. I am new to bird, and am studying an existing bird 1.6 configuration to understand how the system it supports works. Nothing is broken on my system; I just want to understand how it works. In the main bird.cfg within a bgp template, I see this export filter calico_pools; that calico_pools filter calls this via a bird function if ( net = 10.6.130.64/26 ) then { accept; } Now, I correctly see this route as advertised when viewed from a BGP peer. What I don't understand are the semantics of this if-statement. In an export statement, the docs say the relationship is from routing table to protocol export: "This is similar to the import keyword, except that it works in the direction from the routing table to the protocol." What confuses me is that there is *no* net = 10.6.130.64/26 in the local routing table, so where is the value of "net" coming from such that the if-net comparison can be made and the export makes sense works? I know the statement somehow does the right thing; I just don't know how to read and explain it to others in the export context. Can someone please help me understand how to read this? Thanks.

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