From: gladston@br.ibm.com
Date: Tue May 03 2005 - 17:55:14 GMT-3
Do you know what OSPF means with 0.0.0.1?
It is a non-broadcast net, R2 is sending hello to R5. Debug ip ospf hello and debug ip packet det are enabled.
Send hello to 0.0.0.1
Debug ip packet confirms that the destination IP of the hello is unicast address. Area is 0.
r2#
*Mar 1 03:02:11.716: OSPF: Send hello to 0.0.0.1 area 0 on Serial0/0.257 from 172.16.200.2
*Mar 1 03:02:11.716: IP: s=172.16.200.2 (local), d=172.16.200.7 (Serial0/0.257), len 124, sending, proto=89
When the network is broadcast, it says "Send hello to 224.0.0.5" which really is the destination IP.
But when it is non-broadcast, it seems there is no sense on "0.0.0.1". (well, I must say, I could not find the sense, hope feedback clarify it).
r2#sh deb con
*Mar 1 03:06:19.834: OSPF: Send hello to 224.0.0.5 area 11 on Ethernet0/0 from 172.16.26.2
*Mar 1 03:06:19.834: OSPF: Send hello to 224.0.0.5 area 11 on Ethernet0/1 from 172.16.29.2
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