[c-nsp] Cursed IP address

Thu Nov 27 06:58:17 EST 2014

Do you have control of the devices at each L2 hop? Can you run packet captures and see where the hello is dropped?

> Date: Thu, 27 Nov 2014 17:08:45 +0600
> From: vas at mpeks.tomsk.su
> To: Friedrich at pdv-sachsen.net
> CC: vlasovas at sibptus.tomsk.ru; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Cursed IP address
> 
> Friedrich, Gregor wrote:
> > 
> > Seems to be some multicast receiving problem 224.0.0.5/6? 
> 
> Seems like it. The main engima is why only multicast packets with
> src=10.65.127.246 are affected and not from other source addresses.
> Packets from x.x.x.246 addresses in other networks also work without
> problems.
> 
> 
> > Are there filters / IGMP stuff? 
> 
> No.
> 
> > What kind of  L2 design do you have in the segment?  Some years ago
> > we had problems with multicast  and SDH MUX systems. 
> 
> iPASOLINK radio relay towers, iPASOLINK IDU/ODU.
> 
> Below is the OSPF hello debug output from 10.65.127.243 where you can
> see that 10.65.127.243 does not receive hellos from 10.65.127.246.
> Then it marks 10.65.127.246 as down and then immediately receives a
> unicast (?) hello from 10.65.127.246. Then the problem is repeated.
> 
> Nov 27 09:14:17.133: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from LOADING to FULL, Loading Done
> Nov 27 09:14:26.780: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:14:36.300: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:14:45.586: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:14:55.501: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:15:02.421: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from FULL to DOWN, Neighbor Down: Dead timer expired
> Nov 27 09:15:05.257: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:15:05.257: OSPF: Rcv hello from 10.65.127.246 area 0 from Vlan333 10.65.127.246
> Nov 27 09:15:05.257: OSPF: Send immediate hello to nbr 10.65.127.246, src address 10.65.127.246, on Vlan333
> Nov 27 09:15:05.257: OSPF: Send hello to 10.65.127.246 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:15:05.257: OSPF: End of hello processing
> Nov 27 09:15:05.273: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from LOADING to FULL, Loading Done
> Nov 27 09:15:14.945: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:15:24.860: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:15:34.859: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:15:44.413: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:15:52.868: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from FULL to DOWN, Neighbor Down: Dead timer expired
> Nov 27 09:15:54.043: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:15:54.051: OSPF: Rcv hello from 10.65.127.246 area 0 from Vlan333 10.65.127.246
> Nov 27 09:15:54.051: OSPF: Send immediate hello to nbr 10.65.127.246, src address 10.65.127.246, on Vlan333
> Nov 27 09:15:54.051: OSPF: Send hello to 10.65.127.246 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:15:54.051: OSPF: End of hello processing
> Nov 27 09:15:54.059: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from LOADING to FULL, Loading Done
> Nov 27 09:16:04.041: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:16:13.235: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:16:22.781: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:16:32.025: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:16:41.805: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:16:43.374: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from FULL to DOWN, Neighbor Down: Dead timer expired
> Nov 27 09:16:51.569: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:16:51.578: OSPF: Rcv hello from 10.65.127.246 area 0 from Vlan333 10.65.127.246
> Nov 27 09:16:51.578: OSPF: Send immediate hello to nbr 10.65.127.246, src address 10.65.127.246, on Vlan333
> Nov 27 09:16:51.578: OSPF: Send hello to 10.65.127.246 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:16:51.578: OSPF: End of hello processing
> Nov 27 09:16:51.586: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from LOADING to FULL, Loading Done
> Nov 27 09:17:01.350: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:17:10.560: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:17:20.509: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:17:30.063: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:17:36.690: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from FULL to DOWN, Neighbor Down: Dead timer expired
> Nov 27 09:17:39.902: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:17:39.902: OSPF: Rcv hello from 10.65.127.246 area 0 from Vlan333 10.65.127.246
> Nov 27 09:17:39.902: OSPF: Send immediate hello to nbr 10.65.127.246, src address 10.65.127.246, on Vlan333
> Nov 27 09:17:39.902: OSPF: Send hello to 10.65.127.246 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:17:39.902: OSPF: End of hello processing
> Nov 27 09:17:39.911: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from LOADING to FULL, Loading Done
> Nov 27 09:17:49.809: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:17:59.648: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:18:09.370: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:18:18.849: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:18:26.793: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from FULL to DOWN, Neighbor Down: Dead timer expired
> Nov 27 09:18:28.135: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:18:28.135: OSPF: Rcv hello from 10.65.127.246 area 0 from Vlan333 10.65.127.246
> Nov 27 09:18:28.135: OSPF: Send immediate hello to nbr 10.65.127.246, src address 10.65.127.246, on Vlan333
> Nov 27 09:18:28.135: OSPF: Send hello to 10.65.127.246 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:18:28.135: OSPF: End of hello processing
> Nov 27 09:18:28.143: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from LOADING to FULL, Loading Done
> Nov 27 09:18:37.538: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:18:46.782: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:18:56.554: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:19:05.882: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:19:15.470: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:19:17.273: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from FULL to DOWN, Neighbor Down: Dead timer expired
> Nov 27 09:19:25.158: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:19:25.158: OSPF: Rcv hello from 10.65.127.246 area 0 from Vlan333 10.65.127.246
> Nov 27 09:19:25.158: OSPF: Send immediate hello to nbr 10.65.127.246, src address 10.65.127.246, on Vlan333
> Nov 27 09:19:25.158: OSPF: Send hello to 10.65.127.246 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:19:25.158: OSPF: End of hello processing
> Nov 27 09:19:25.183: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from LOADING to FULL, Loading Done
> Nov 27 09:19:34.209: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:19:43.612: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:19:53.435: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:20:03.232: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:20:10.497: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from FULL to DOWN, Neighbor Down: Dead timer expired
> Nov 27 09:20:12.669: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:20:12.678: OSPF: Rcv hello from 10.65.127.246 area 0 from Vlan333 10.65.127.246
> Nov 27 09:20:12.678: OSPF: Send immediate hello to nbr 10.65.127.246, src address 10.65.127.246, on Vlan333
> Nov 27 09:20:12.678: OSPF: Send hello to 10.65.127.246 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:20:12.678: OSPF: End of hello processing
> Nov 27 09:20:12.686: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from LOADING to FULL, Loading Done
> Nov 27 09:20:21.703: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:20:31.333: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:20:40.862: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:20:49.989: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:20:59.459: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:21:00.986: %OSPF-5-ADJCHG: Process 20, Nbr 10.65.127.246 on Vlan333 from FULL to DOWN, Neighbor Down: Dead timer expired
> Nov 27 09:21:08.745: OSPF: Send hello to 224.0.0.5 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:21:08.745: OSPF: Rcv hello from 10.65.127.246 area 0 from Vlan333 10.65.127.246
> Nov 27 09:21:08.745: OSPF: Send immediate hello to nbr 10.65.127.246, src address 10.65.127.246, on Vlan333
> Nov 27 09:21:08.745: OSPF: Send hello to 10.65.127.246 area 0 on Vlan333 from 10.65.127.243
> Nov 27 09:21:08.745: OSPF: End of hello processing
> 
> 
> -- 
> Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
> sip:sudakov at sibptus.tomsk.ru
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