April 2011 - Bird-users - Mailing Lists

how to confirm which capabilities have been negotiated
by Eiichiro Watanabe 24 Oct '11

24 Oct '11

Hello, Do we have an appropriate command to show which BGP capabilities have been negotiated on bird after a peer has been established? Of course, I known I can recognize when I look into packets captured, or confirm it on the neighbor router by using "show ip bgp neighbor x.x.x.x" command (in the case of CiscoIOS). it wouldn't be smart. Thanks, eiichiro -- ################################################### Eiichiro Watanabe Internet Multifeed Co.

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Troubleshooting "Optional attribute error"
by Ruben Laban 31 May '11

31 May '11

Hi, After having been down for some time, I decided to bring up an old test session (IPv6 full table). However, the session doesn't come up fully. I do see a fair amount of UPDATE packets coming in, but then at a certain point the connection gets closed and the routes purged again. All I can find in the logs is "Optional attribute error", even with "debug all all". Is there some other trick to find out what the actual problem is with this session? Regards, Ruben Laban

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BIRD at MSK-IX
by Mikhail A. Grishin 27 May '11

27 May '11

Hi, We successfully finished the process of adaptation BIRD to MSK-IX network. Currently BIRD is running on both IPv4 Route Servers (version 1.2.0 with some patches from Ondrej Zajicek). Also we modified our public Looking Glass service. It's available via: http://www.msk-ix.ru/eng/lookingglass.html Thank you for help and cooperation! -- Mikhail A. Grishin E-mail: magr(a)ripn.net

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Re: [OSPF] BIRD <> Mikrotik checksum
by Adrian Czapek 13 May '11

13 May '11

>On Thu, Sep 02, 2010 at 11:36:22AM +0200, Maciej Drobniuch wrote: >> Hi! >> I have a problem with binding bird with mikrotik router os. >> The RouterOS says: >> Discarding packet: wrong checksum. > >Strange. I will check that. Did you find anything? I've experienced the same problem last evening. Suddenly I've found my routeros logs flooded by: mar/16 23:32:31 route,ospf,info Discarding packet: wrong chekcsum mar/16 23:32:31 route,ospf,info source=78.31.143.69 this is backup link, with cost set to 100 on both sides - main link, between the same bird and the same routeros has been working perfectly. I first tried to reload ospf1 from bird console and guess what happened... main link went dead too... wrong checksums on both links. Then I did reload ospf1 again, main link went up, backup link stayed dead, but suddenly, other routeros in this area went dead: mar/16 23:37:27 route,ospf,info Discarding packet: wrong chekcsum mar/16 23:37:27 route,ospf,info source=78.31.136.169 I started to freak out and pullled bigger cannon: restart ospf1 - result: those 2 routeros went up (besides backup link - source=78.31.143.69), but heh, 3rd routeros went down mar/16 23:39:57 route,ospf,info Discarding packet: wrong chekcsum mar/16 23:39:57 route,ospf,info source=78.31.139.21 well, that was to much, I shutdown whole bird and started it again... all went up except the first mentioned backup link (which never went up btw). So I decided to go back to quagga and check it there with the same config. Disabled ospf in bird, started quagga and everything went up, even that backup link. I've left it for about an hour and stopped quagga, enabled ospf on bird, and everyting works fine, all links are up, backup link too. What may be wrong? Regards -- Adrian

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BIRD: route selection question
by Mikhail A. Grishin 13 May '11

13 May '11

Hi, Why in the example below, the route via 194.226.100.51 is the best? According http://bird.network.cz/?get_doc&f=bird-6.html#ss6.1 Route selection rules ... "Prefer the lowest value of the Multiple Exit Discriminator." And at both peers we have commented string --- # default bgp_med 0; # MED value we use for comparison when none is defined --- and the default value is 0. Probably, for the route via 194.226.100.45 , the MED should be counted as zero, and this route should win? BIRD 1.2.5 ready. bird> show route 194.105.192.0/19 all 194.105.192.0/19 via 194.226.100.51 on em0 [R20632x1 2011-03-22 21:37:36] * (100) [AS6820i] Type: BGP unicast univ BGP.origin: IGP BGP.as_path: 20632 6820 BGP.next_hop: 194.226.100.51 BGP.med: 160 BGP.local_pref: 100 via 194.226.100.45 on em0 [R3277x1 2011-03-16 12:47:37] (100) [AS6820i] Type: BGP unicast univ BGP.origin: IGP BGP.as_path: 3277 6820 BGP.next_hop: 194.226.100.45 BGP.local_pref: 100

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Blog post about monitoring bird with Nagios
by David J Craigon 02 May '11

02 May '11

Hello, I've written a blog post about how I monitor Bird protocol sessions using Nagios and SNMP, which I thought might be of interest to people who read this list. I'm also interested as to whether it makes any sense, because if it doesn't make any sense to folk on this list I've no hope. Anyhow, it's at http://www.littleowlconsultancy.com/blog/how-we-monitor-bird-using-snmp-and… David

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IBGP- disappearing routes
by David J Craigon 18 Apr '11

18 Apr '11

Hello, I have two routers running Bird. I am exporting the internet's routing table from one into the other via IBGP. If I use wireshark, I can see many routes going across the network. If I run Bird in debugging mode. I get lots of "ibgp: Got UPDATE" log messages. But no routes appear in my routing tables, and the counters when I do "show protocols all ibgp" never change. I have the filters set to "export all; import all;" Any clues? David

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Routing for VPN network
by Ask Bjørn Hansen 06 Apr '11

06 Apr '11

Hi everyone, I'm using 'bird' to announce some prefixes for the anycast DNS servers for the NTP Pool system. It's working great and I really enjoy how straightforward the configuration is. We're planning to make the DNS servers (about ~18 currently) all connect to two out of three "master nodes"; probably one in Europe and one in western and one in eastern United States. For another similar VPN network I use BGP with private ASN's for the routing; but for this project each site is generally just one or two actual servers, so allocating a private ASN and all that seems extra tedious. Would it make sense to use OSPF for this instead? My only experience with OSPF is setting it up between routers in one site so they know how to get to the 'next hop' of routes coming in and shared via BGP/IBGP. I've also been considering just running IPv6 on the VPN instead; but I have even less experience with OSPFv3. :-) Any advice? - ask -- Ask Bjørn Hansen, http://askask.com/

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ospf uses private ip as a gateway
by Martin Kraus 04 Apr '11

04 Apr '11

Hi. I'm using bird 1.2.5 from debian squeeze respository. I've got two routers with public a private ip addresses on the connecting interfaces. The public addresses are selected as primary in device protocol but ospf chooses private address as the address to route prefixes over. When I block ospf packets from the private addresses it switches fine but when I allow ospf to them it switches all the routes to the private gateways again. Is there any way to force bird to use public addresses other then setting them as primary in device protocol specification? I want to keep interface names in interfaces definitions instead of ip addresses. thanks for your help mk

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Modify Bird to recognize packet fields
by Marco Basaldella 04 Apr '11

04 Apr '11

Hi everyone, I have to modify a router to recognize some special packet fields, in order to implement a particular protocol we are testing. I thought I could modify BIRD, since we're using it in our Faculty ( I am research fellow at the Engineering Department of my University), but fist of all I'd like to know if is it possible. I've read the wiki and the Coder's doc, but I haven't found an answer for my question. Does BIRD have a built-in engine that scans packet fields in ipv4 or ipv6 headers, or does it rely completely on the underlying architecture to get packet informations from the interfaces? (i.e. like other software routers do, like XORP) Is it possible to do such modifications to BIRD? Thanks, -Marco

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