Hi all,
As per my earlier thread of pinging to network ID ->
https://supportforums.cisco.com/discussion/12490926/ping-no-response-found-what-does-it-meant
I am now trying to ping to remote broadcast address (from R1 @ 192.168.3.0/24 to R2 @ 192.168.5.0/24)
q1) where does a network address actually resides ? (e.g. 192.168.5.0 , is it at R2 or R3 or both ?)
q2) on local broadcast 1st, what happen if i send a broadcast from R1 (fe0/0) to 192.168.3.255 ? Does the broadcast still propagates back to R1 fe0/0 ? on it will be only 1 direction and thats to R2 fe0/0.
q3) I am seeing this responses from 3.2 back to 3.1
355 1002.873686000 192.168.3.1 255.255.255.255 ICMP 114 Echo (ping) request id=0x0073, seq=1/256, ttl=255 (no response found!) 356 1002.920564000 192.168.3.2 192.168.3.1 ICMP 114 Echo (ping) reply id=0x0073, seq=1/256, ttl=255 357 1004.889430000 192.168.3.1 255.255.255.255 ICMP 114 Echo (ping) request id=0x0073, seq=2/512, ttl=255 (no response found!) 358 1004.967556000 192.168.3.2 192.168.3.1 ICMP 114 Echo (ping) reply id=0x0073, seq=2/512, ttl=255
- why is it 255.255.255.255 and not 192.168.3.255 ? since i am pinging to this subnet (3.0) broadcast ip (3.255)
- why is there a no respond found in the ping request, but there is still a reply coming from 3.2
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q4) I have thought routers break up broadcast domain, hence if try to send some information (e.g. ping ) to 192.168.5.255, i should not get any respond. but yet i do and it is coming from 192.168.3.2 !? Why.. (confused)..
R1#ping 192.168.5.255 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.5.255, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 32/51/88 ms Wireshark capture on R2 fe0/0 452 1434.070095000 192.168.3.1 192.168.5.255 ICMP 114 Echo (ping) request id=0x0075, seq=0/0, ttl=255 (no response found!) 453 1434.132596000 192.168.3.2 192.168.3.1 ICMP 114 Echo (ping) reply id=0x0075, seq=0/0, ttl=255 454 1434.195100000 192.168.3.1 192.168.5.255 ICMP 114 Echo (ping) request id=0x0075, seq=1/256, ttl=255 (no response found!) 455 1434.210726000 192.168.3.2 192.168.3.1 ICMP 114 Echo (ping) reply id=0x0075, seq=1/256, ttl=255
I did not turn on ip direct-broadcast on R2fe0/1 and doing a capture on R2 fe0/1 show that there is no outgoing ping packets from 3.1, but why 3.2 is responding to ping to 5.255 ?
Regards,
Noob
