08-30-2018 03:34 AM
Hi here!
i was confused about pinging address of network
i've the next scheme:
i sending ping from R1 to the address 172.16.0.0, and R2 reply to me from the linknet of address 10.1.2.2, as result, i can see replay on R1.
R1#ping 172.16.0.255 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.0.255, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 4/10/16 ms
what happened is? and why i can ping address 172.16.0.0
08-30-2018 03:41 AM
you are pinging a broadcast address. what happens if you ping
172.16.0.2???
08-30-2018 03:47 AM - edited 08-30-2018 07:00 AM
ping doesn't pass. because, on R3 don't have a default gateway.
08-30-2018 03:54 AM
R2 responds to the directed broadcast from R1.
check this url to get an insight into the mechanmnism:
https://learningnetwork.cisco.com/thread/25864
08-30-2018 04:00 AM
but, "The no ip directed broadcast has been the default on routed interfaces for a number of years now."
https://learningnetwork.cisco.com/thread/41894
in this case the R2 shouldn't responce to me
08-30-2018 05:10 AM - edited 08-30-2018 05:13 AM
in addition, the direct broadcast for network the 172.16.0.0/24 this is 172.16.0.255, but we do send ping to address 172.16.0.0
08-31-2018 07:37 AM
guys, have a any ideas? :)
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