- Bird-users - Mailing Lists

Mailing list test
by Gustavo Ponza 25 Oct '14

25 Oct '14

test.... gus i0ojj _______________________________________________ Bird-users mailing list Bird-users(a)trubka.network.cz http://trubka.network.cz/mailman/listinfo/bird-users

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Another Netlink: File exists
by micah 24 Oct '14

24 Oct '14

Hello, I read the FAQ on the wiki, and every thread I could find on this list to try and track down how to stop this message hitting my logs every 15 seconds (and filling them every few days), but I have had no luck. I'm just doing bgp, no OSPF, my kernel protocol already is in 'learn' mode, so I set the preference to 100000, but that didn't change anything. I tried 'debug all;' and 'debug {routes};' in the kernel protocol, but ended up only really getting anything from doing: echo all debug all all which then showed me: >>> kernel1: Scanning routing table >>> kernel1: 0.0.0.0/0: [alien] seen >>> kernel1: 1.0.0.0/24: seen >>> kernel1: 1.0.4.0/24: seen ... >>> Netlink: File exists >>> Netlink: File exists >>> Netlink: File exists bird> show route 0.0.0.0/0 0.0.0.0/0 via 208.99.192.141 on eth3 [kernel1 08:44:51] * (10000) I am adding that in my system's startup script, not via bird. Also, that route should be filtered out, as I have the following filters: function martians() { return net ~ [ 169.254.0.0/16+, 192.168.0.0/16+, 10.0.0.0/8+, 172.24.0.0/13+, 172.25.0.0/16+, 172.26.0.0/16+, 172.27.0.0/16+, 172.28.0.0/16+, 172.29.0.0/16+, 172.30.0.0/16+, 172.31.0.0/16+, 224.0.0.0/4+, 240.0.0.0/4+, 0.0.0.0/32-, 0.0.0.0/0{25,32}, 0.0.0.0/0{0,7}, 127.0.0.0/8+ ]; function rt_import_all(int asn) { if martians() || local_network() then return false; if bgp_path.first != asn then return false; if bgp_path.len > 64 then return false; # not sure this works with multi-hop, so disabling # if bgp_next_hop != from then return false; return true; } filter bgp_in_cogent { if ! rt_import_all(174) then reject; accept; } filter bgp_in_swiftco { if ! rt_import_all(25700) then reject; accept; } I tried to run bird -d to get some debugging output, but it didn't provide me with any (i'm using debian version 1.4.4-1~bpo70+1). Finally, is there a way to use a more useful pager with birdc? If I do 'show routes' I cannot search with the existing pager, or do other interesting things, like I can with 'less'. Thanks for your help! micah

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Prefix for BIRD maillist emails
by Fernando Frediani 23 Oct '14

23 Oct '14

Hi chaps, Just an small cosmetic detail to whoever is responsible for the mail list. Perhaps would be nice to have on every email subject sent by the Maillist system the Prefix [BIRD] or [BIRD-Users] to identify more clearly the incoming emails. Would it be possible to consider it ? Thanks Fernando

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Way to use Bird as route server
by Osmos 23 Oct '14

23 Oct '14

Hi there, just doing some tests with Bird as route server, but the result was not the desired. Other staff like RTBH is running fine. The situation is that next-hop is not modified (used only RS CLIENT option). All are eBGP sessions. Checked some examples around and found no way to deploy correctly. Any advise or template to achieve this function? Thanks in advance. Regards, Jorge.

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rfc5185 - Multiarea Adjacency
by Eugene M. Zheganin 23 Oct '14

23 Oct '14

Hi. Does bird support the RFC 5185 ? I need to use it with a JunOS device. Seems like in Junos there's a problem with situation when two routers have more than one neighborship over some links that are in different areas (the usual workaround for this). Thanks.

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Feature request: static routes to not directly connected gateways
by Alexander Demenshin 23 Oct '14

23 Oct '14

Hi, It would be nice to be able to use "indirect" gateways, i.e. which are routed via interface but are not part of interface networks, like this: protocol static { route 10.1.1.0/24 via "eth0"; route 10.2.1.0/24 via 10.1.1.1; } Linux supports this, so it would be really useful and opens interesting opportunities, like automatically adding routes once specified gateway becomes reachable after adding an interface-bound route (either outside or inside of Bird). One possible application (from my actual configuration) is routing of specific networks through VPN gateway - the gateway itself is in /30 transfer network (and this could not be changed easily) so I could not make it reachable directly on more than one Bird router simultaneously. Please consider this for next release :) Thank you! -- With best regards, Alexander.

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Suggestions to achieve multiple VRFs?
by Michael Fincham 22 Oct '14

22 Oct '14

Hi all, Presently I am testing a network design consisting of BIRD routers running a fairly unexciting "OSPF on linknets and loopback interfaces, iBGP mesh" type network. I am interested in suggestions for sensible ways to split a network of BIRD routers like this in to multiple VRFs - for instance to define a "management" VRF alongside the standard inet table. It seems simple to set up multiple routing tables on any given router and to learn routes in to those tables, however I am interested in suggestions for ways to distribute that routing information, as there seem to be several mechanisms that could be used. I'd like to avoid running multiple linknets and OSPF instances over my linknets if possible. -- Michael

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Re: bird's not forwarding point-to-point routes via OSPF
by Noel Burton-Krahn 16 Oct '14

16 Oct '14

Thanks Ondrej, In our case, we're assigning peer point-to-point addresses on veth interfaces that we use for LXC containers. So they're essentially mini subnets with two interfaces. I didn't expect bird to treat peer addresses differently, so it took a few hours to figure out exactly what the problem was and how to work around it. So, I'd vote for either always allowing peer addresses, or adding a configuration option to make that behaviour more explicit. We'll work around that for now by adding a second /32 IP address to each interface. Cheers, -- Noel On Thu, Oct 16, 2014 at 7:42 AM, Ondrej Zajicek <santiago(a)crfreenet.org> wrote: > On Wed, Oct 15, 2014 at 11:00:03AM -0700, Noel Burton-Krahn wrote: > > Is there something about point to point addresses that could keep bird > > from forwarding them? I'm assigning a point-to-point address to a > > veth pair like so: > > > > ip link add veth1 type veth peer name veth2 > > ip addr add 10.0.0.1/32 peer 10.0.0.2/32 dev veth1 > > ip addr add 10.0.0.2/32 peer 10.0.0.1/32 dev veth2 > > > > Neither of those addresses get forwarded via OSPF to other hosts. > > They *do* get forwarded if I add the addresses without a peer like > > this: > > > > ip addr add 10.0.0.1/32 dev veth1 > > > > Now I've added the same address (10.0.0.1/32) to veth twice, and bird > > is forwarding a route for that address to OSPF peers. > > > > Is there a way for bird to accept the "peer" address? I tried "learn" > > in the kernel but that didn't help. > > .. also .. > > On Fri, Oct 10, 2014 at 12:05:30PM +0200, Thomas Goldberg wrote: > > Hello, > > > > we've OSPF running over a openvpn ptp tunnel and some problems with > > the routes injected by bird (v1.4.5). > ... > > Shouldn't bird inject routes like this on the corresponding router > > (without having to learn them via the direct protocol)? > > 10.176.3.29/32 dev lo [o_internal 2014-10-09 00:00:00] * I (150/0) > [10.176.3.29] > > Hello > > This is IMHO the same issue. It is an intentional behavior, BIRD does not > inject local address for links with peer addresses, mainly based on idea > that links with such addresses are just variants of 'unnumbered' ptp > links and these addresses are just general 'loopback' addresses and are > usually also used on other interfaces (like the explicit loopback > interface) [*]. > > Also note that it is usually simpler to add wanted addresses (using > explicit loopback interface or using 'stubnet' option) in use cases where > they should be propagated than remove unwanted addresses in use cases > where they should not be propagated. > > But in retrospect i am not sure if this behavior was really a good idea. > Perhaps automatic adding of host routes should be configurable and > enabled by default for peer addresses to ensure that all addresses on > OSPF-enabled interfaces are reachable in OSPF area. > > Any comments (esp. arguments for or against it) to this issue? > > > > [*] i.e. configuration like: > > ip addr add 10.0.0.1/32 dev lo / dummy0 > ip addr add 10.0.0.1/32 peer 10.0.0.2/32 dev eth0 > ip addr add 10.0.0.1/32 peer 10.0.0.3/32 dev eth1 > ip addr add 10.0.0.1/32 peer 10.0.0.4/32 dev eth2 > > -- > 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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All structures for network packets must have __attribute__((packed))
by Maksim Tamarsky 16 Oct '14

16 Oct '14

All structures for network packets must have __attribute__((packed)) We already speak about this problem 2 years ago. On my platform i have bad structure alignment in ospf and i need make this fix. ospf.h .............. struct immsb { #ifdef CPU_BIG_ENDIAN u8 padding:5; u8 i:1; u8 m:1; u8 ms:1; #else u8 ms:1; u8 m:1; u8 i:1; u8 padding:5; #endif }*__attribute__((packed))*; union imms { u8 byte; struct immsb bit; }*__attribute__((packed))*; ....... -- RU: Тамарский Максим Александрович Инженер-программист ООО Эн-Эс-Джи г.Москва, Кирпичная 39/41 оф.1302 Почтовый адрес: 105187 Россия, Москва ул.Вольная, д.35, оф.NSG Тел./факс: +7 495 727-19-59 Web-сайт: http://www.nsg.ru EN: Maksim Tamarsky Software Engineer NSG Ltd. 35 Volnaya Street, 105187 Moscow, Russia +7 495 727-19-59 http://www.nsg.ru

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Multiple OSPF instances on one interface
by Tore Anderson 16 Oct '14

16 Oct '14

Hi, I'm trying to run two instances of OSPFv3 on a single interface, one in stub mode, the other in normal broadcast mode. It doesn't seem to work, in one of the protocols the interface ends up being marked "down". I don't see why that would be, since one of the instances is in stub mode, there should be no conflict between the two instances. bird6.conf on my test node contains the following ospf stanzas: protocol ospf main_igp_topology { area 10 { interface "eth0" { stub yes; }; }; } protocol ospf customer_anycast { area 20 { interface "eth0" { type broadcast; }; }; } After starting BIRD6, eth0 in the "customer_anycast" instnace is marked down, but looks fine in "main_igp_topology": root@kvmtest:~# birdc6 show ospf interface main_igp_topology BIRD 1.4.5 ready. main_igp_topology: Interface eth0 (IID 0) Type: broadcast Area: 0.0.0.10 (10) State: waiting (stub) Priority: 1 Cost: 10 Hello timer: 10 Wait timer: 40 Dead timer: 40 Retransmit timer: 5 Designed router (ID): 0.0.0.0 Designed router (IP): :: Backup designed router (ID): 0.0.0.0 Backup designed router (IP): :: root@kvmtest:~# birdc6 show ospf interface customer_anycast BIRD 1.4.5 ready. customer_anycast: Interface eth0 (IID 0) Type: broadcast Area: 0.0.0.20 (20) State: down <---- why? Priority: 1 Cost: 10 Hello timer: 10 Wait timer: 40 Dead timer: 40 Retransmit timer: 5 Designed router (ID): 0.0.0.0 Designed router (IP): :: Backup designed router (ID): 0.0.0.0 Backup designed router (IP): :: Disabling "main_igp_topology" immediately brings "customer_anycast" to life (at this point I can see in tcpdump that OSPFv3 hellos start being being trasmitted): root@kvmtest:~# birdc6 disable main_igp_topology BIRD 1.4.5 ready. main_igp_topology: disabled root@kvmtest:~# birdc6 show ospf interface customer_anycast BIRD 1.4.5 ready. customer_anycast: Interface eth0 (IID 0) Type: broadcast Area: 0.0.0.20 (20) State: waiting <---- looking better! Priority: 1 Cost: 10 Hello timer: 10 Wait timer: 40 Dead timer: 40 Retransmit timer: 5 Designed router (ID): 0.0.0.0 Designed router (IP): :: Backup designed router (ID): 0.0.0.0 Backup designed router (IP): :: The use case is that of a server LAN that needs to be allowed to dynamically advertise certain host routes to service addresses for anycast / fail-over purposes. I would then proceed to import those host routes into my IGP, which is the OSPFv3 instance that runs in stub mode (after ensuring the announced routes fall within a permitted prefix). I have used RIPng instead of OSFPv3 for the "customer_anycast" role before, but it is very slow to react to failures and is rather limited in other ways too. So I was hoping replace it with OSPFv3, hopefully with BFD for super-fast failure detection. Tore

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