February 2017 - Bird-users

Remove Private As Example
by Darren Marshall 20 Feb '17

20 Feb '17

Hi guys, Does anyone have an example bird configuration for remove private-as numbers , looking for same functionaility as the Cisco remove-private-AS knob. Thanks daz

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filter & filter function
by Борис Коваленко 19 Feb '17

19 Feb '17

Hello! A little question I haven't found an answer in docs. When I use filter I use accept or reject for prefixes. But what if I use import/export where construction? May I use accept and reject too instead of return true/false? Regards, Boris -- С уважением, Борис Коваленко

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bit operators
by Борис Коваленко 19 Feb '17

19 Feb '17

Hello! I have an idea to write common filters like define RF_REDISTRIBUTE_CONNECTED 0x10 define RF_REDISTRIBUTE_STATIC 0x20 ..... protocol ospf main_ospf { export where f_main_ospf_e(RF_REDISTRIBUTE_CONNECTED | RF_REDISTRIBUTE_STATIC); ..... } function f_main_ospf_e(int flags) { if(source ~ [RTS_STATIC, RTS_STATIC_DEVICE] && (flags & RF_REDISTRIBUTE_STATIC) ........ } Unfortunatelly there are not bit operators :( But may be there is another way? Regards, Boris -- С уважением, Борис Коваленко

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Route attributes overwritten during reconfiguration
by João Taveira Araújo 17 Feb '17

17 Feb '17

Hi, I've run into a bug which manifests itself during reconfiguration. Unfortunately, the bird config in question is extremely large and I can't easily cut it down to something replicable. I'm running into this particular issue in bird6, but have no reason to believe IPv4 would fair any better. All results are using bird 1.6.2. My setup is as follows: - a static protocol, in which the import stanza adds extended communities: route 2001:db8::/48 via "lo" { bgp_ext_community.add((ro, 2, 0)); bgp_ext_community.add((ro, 3, 0)); ... } - based on these communities, the static route makes its way through a pipe from the master table, to an external table Typically all is fine - we export the route to our transits. Since we have multiple egress devices, a "show route" will show our local, static route, as well as the same route learnt through our providers: sudo birdc6 show route for 2001:db8::/48 BIRD 1.6.2 ready. 2001:db8::/48 dev lo [static_protocol 04:42:26] * (200) via xxx on et1 [transit_1 03:44:07] (100) via xxx on et2 [transit_2 03:44:07] (100) We actually have three transits, but one of our transits does not export any routes we happen to be exporting to them. Such a case happens on reconfiguring BIRD. During a reconfiguration, the static protocol gets reloaded: <TRACE> static_protocol > 2001:db8::/48 added [best] dev lo in this brief moment, a window of opportunity arises for our thus far silent transit to make an unwanted appearance: sudo birdc6 show route for 2001:db8::/48 BIRD 1.6.2 ready. 2001:db8::/48 dev lo [static_protocol 05:44:07] * (200) via xxx on et3 [transit_3 05:44:07] (100) via xxx on et1 [transit_1 03:44:07] (100) via xxx on et2 [transit_2 03:44:07] (100) This, it turns out, is tragic, because somehow the extended communities we apply to the route learnt from transit_3 clobber the ones we apply in static_protocol. I'm pretty sure something screws up the rta associated to the static route, but I'm also confused as to why the static protocol seems to get reloaded at all given there is no configuration change in the first place. We definitely want to allow local as: since the routes are potentially anycast, it is useful to have an alternate route in case we shut down the static announcement. Thanks, - j

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OSPF ptmp
by Борис Коваленко 17 Feb '17

17 Feb '17

Hello! Trying to run bird on ethernet interface with type = ptmp. Yes, I know that ethernet is broadcast interface, but there is a good practice to use ptmp on ethernet. I found a strange bug. When type = ptmp, bird sends only one Hello packet and then stops (and even receive?) next packets until I fully restart bird, while other side (cisco or mikrotik) sends packets every 10s (as configured). There is no problems with type = broadcast Here is my simple test configuration: protocol ospf main_ospf { import all; instance id 0; tick 5; area 0.0.0.0 { networks { X.X.16.78/32; X.X.16.80/28; }; interface "lo1" { type ptp; hello 60; retransmit 10; dead 30; }; interface "em0.102" { cost 10; type ptmp; hello 10; retransmit 5; dead 40; # authentication cryptographic; password "XXXXX" { id 1; algorithm keyed md5; }; }; }; } FreeBSD - 11-STABLE Bird 1.6.3 With regards, Boris -- С уважением, Борис Коваленко

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Invalid example for RIPv2 in User's Guide
by Steve Leung 17 Feb '17

17 Feb '17

http://bird.network.cz/?get_doc&f=bird-6.html#ss6.10 In the link above, the RIP section's example will return config error in bird v1.6.3. Is this an outdated example for older version of bird? protocol rip { debug all; port 1520; period 12; garbage time 60; interface "eth0" { metric 3; mode multicast; }; interface "eth*" { metric 2; mode broadcast; }; authentication cryptographic; password "secret-shared-key" { algorithm hmac sha256; }; import filter { print "importing"; accept; }; export filter { print "exporting"; accept; }; } Best regards, Steve

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BGP dynamic filtering
by Liran Schour 15 Feb '17

15 Feb '17

Hi all, I want to implement a dynamic filter where I will export a route based on matching against a dynamic set of prefixes. The set is maintained according to a database. 1. Can I maintain a dynamic set of prefixes and change the set on the fly? What are the performance impacts of this? 2.. Where can I find such an example? - Liran

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Appeal for Conservation Donations
by Werner van der Walt 12 Feb '17

12 Feb '17

Dear Birders, As many of you may know, the 'Champions of the Flyway' is an annual event that takes place in Eilat, Israel. This year the event is on March 28th. The event takes the form of a Big Day - essentially a midnight-to-midnight race to see which team can record the most species over that time. But more importantly, the race is used as a vehicle to raise funds for the protection of important bird migration flyways. Over 25 million birds are illegally slaughtered by hunters and trappers along these routes each year, and the Champions of the Flyway contributes significant funds to projects combating this. This year the anti-hunting projects of BirdLife's affiliate in Turkey, Doga, is the beneficiary. Teams from all over the world gather in Eilat, itself a migration hotspot, to help the conservation of migratory birds. South African teams have participated in this event for the last few years, and have competed incredibly well in the fundraising aspect, especially considering that we compete with much stronger currencies in the dollar, pound, and euro. We have also traditionally competed well on race day, especially considering that many teams are much more familiar with the Palearctic species present there. This year the South African representation takes on a youth flavour. Our team, the Birding Ecotours 'Youth Africa Birders', is made up of John Kinghorn, Werner van der Walt (both Johannesburg), Jessleena Suri, and Andrew de Blocq (both Cape Town). None of us iolder than 25, and we are representing not only our country but also the Youth Africa Birding movement, of which John is the Chairman and Werner is the Vice-chairman. This movement encourages birding as a hobby for the African youth. We are especially motivated to contribute to Doga's work this year, since a central part of their already-successful project is educating the younger Turkish generation about the negative effects of hunting, and to convert them to bird enthusiasts rather than hunters. We have been preparing for months now by studying books on Middle Eastern birds, listening to calls sourced online, and perusing multiple local blogs to make sure we stand the best chance possible of competing on all fronts. We are hoping to show the birding establishment that we youngsters can mix it with the best of them! In addition to competing on race day and in the fundraising competition, we are also aiming to abide by our team slogan and #BringTheGees to Eilat! The success of past South African teams has been primarily because of the support of the birdwatching community. Past responses to calls for funds have been met with overwhelming generosity, and we are hoping that you will support this very important cause again this year. We are aiming to raise €3500 (plus minus $3700) as a team which will go directly to BirdLife International's Turkish affiliate. If you are able to spare some funds you can be assured that this is a very worthwhile cause - no donation is too big or too small! Official donations to the cause go through the JustGiving link on our official team page, which can be found on the event website as well as at the bottom of this email. If you wish to assist us in getting ourselves over there (costs amounting to approximately $1200 pp), then please do feel free to contact us for more information. Even if you are not able to assist us, please feel free to follow us on our social media! We will be posting relevant, informative articles, team profiles, and you will be able to live this incredible experience vicariously through us. :) www.facebook.com/BEyouthafricabirders/ On twitter as @youthafricabirding Official team page www.champions-of-the-flyway.com/youth-africa-birders/ Just giving link : https://www.justgiving.com/fundraising/COTF2017-YAB Our sincere thanks in advance to all of you! Please do not hesitate to ask any further questions. Yours in Birding and Conservation, John, Werner, Jess, and Andrew

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Re: Administrative distance
by Ondrej Zajicek 07 Feb '17

07 Feb '17

On Fri, Feb 03, 2017 at 10:07:49AM +0500, Михаил Хотько wrote: > Okay, do u know what means "!" in show routes? We run bird 1.5.0 on busybox > for routing management, and when I add multipath default route bird marks > it with "!" and routes doesnt go to kernel. Hello Mark "!" means that BIRD failed to push the route into the kernel. There are several possible reasons for that: 1) There is already a route for that network 2) Kernel is compiled without multipath support 3) Some next hop of the route is not valid Does it work with unipath next hop on the busybox? Could you create multipath routes on the device with some other tool (e.g. ip)? -- Elen sila lumenn' omentielvo Ondrej 'Santiago' Zajicek (email: santiago(a)crfreenet.org) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so."

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Wrong default route announced with OSPF
by Thomas Berger 07 Feb '17

07 Feb '17

Hi all, we have a strange issue with bird and OSPF: We have set up a two redundant firewall clusters, one for external and one for internal routing. The setup is working well, as long as only the active external firewall has bird running. If we start bird on the passive firewall, the wrong Gateway for 0.0.0.0/0 is announced: The passive firewall has no default route in the main table ( until it imports the one from its peer of course) _active firewall ( before and after starting bird on the passive fw)_ bird> show route all 0.0.0.0/0 via 178.19.71.1 on eth1 [kernel1 03:59:51] * (10) Type: inherit unicast univ Kernel.source: 3 Kernel.metric: 4 _internal firewall before the start if the second bird instance_ 0.0.0.0/0 via 10.11.0.1 on fwfwtrans [ppospf 17:39:36] * E2 (150/15/10000) [10.11.0.1] Type: OSPF-E2 unicast univ OSPF.metric1: 15 OSPF.metric2: 10000 OSPF.tag: 0x00000000 OSPF.router_id: 10.11.0.1 _internal firewall after the start if the second bird instance_ 0.0.0.0/0 via 10.11.0.2 on fwfwtrans [ppospf 17:38:03] * E2 (150/15/10000) [10.11.0.1] Type: OSPF-E2 unicast univ OSPF.metric1: 15 OSPF.metric2: 10000 OSPF.tag: 0x00000000 OSPF.router_id: 10.11.0.1 Any idea? -- Thomas Berger BundesIT Piratenpartei Deutschland – Pirate Party of Germany Pflugstraße 9a, D-10115 Berlin, Germany Patrick Schiffer (Vors.), Carsten Sawosch (Stellv. Vors.), Kristos Thingilouthis (Pol. GF), Lothar Krauß (Schatzm.), Thomas Knoblich (Stellv. GS), Alexander Niedermeier (Stellv pol. GF), Steffen Heuer (Stellv. Schatzm.)

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