[c-nsp] Cursed IP address

[Victor Sudakov]

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