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Old 09-18-2002, 08:18 AM   #1
Registered: May 2002
Location: Shanghai, PRC
Distribution: RedHat 6.2 | 7.2 | 8 | 9|3
Posts: 81

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Talking question about network address and broadcast address

Hi all,

I just feel very confused about some basic network concept.
Today I found I can *ping* a network address, like the following
[root@root]# ping
PING ( from : 56(84) bytes of data.
64 bytes from icmp_seq=0 ttl=126 time=3.443 msec
64 bytes from icmp_seq=1 ttl=126 time=2.085 msec
I know when I *ping* a host, actually I send a packet to that host and
then the packet returns back to my PC. But now I *ping* a network
address. Where does this packet go to? Does it mean that I am sending
the packets to every host in this network? If so, what will happen
when I *ping* a broadcast address?
[root@root]# ping -b
PING ( from : 56(84) bytes of
64 bytes from icmp_seq=0 ttl=254 time=1.907 msec
64 bytes from icmp_seq=1 ttl=254 time=1.246 msec
Please help me to explain the principle.
Any suggestion will be appreciated.

Old 09-18-2002, 11:47 AM   #2
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Registered: Sep 2002
Location: Nashville, TN
Posts: 1,552

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Depending on your router and the devices on your network, you may get a response from every device on the network if you ping the network address or broadcast address. Many network admins are now filtering this out because it can be used to flood a system (check out smurf attacks).


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