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Broadcast Ip address ping problem


I am using an 16.168.80.0 network with ip address from 1 to 254.My subnet mask is 255.0.0.0. My problem is that   am able ot ping 16.168.80.255 ( Broadcast address ) . But it  doesnot ping 16.168.80.0 . I am really confused why it is pinging one broadcast address and other doesn't. Ideally it shoudn't ping any broadcast address. Can anyone give me a solution.
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rajeshrub
Asked:
rajeshrub
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1 Solution
 
rajeshrubAuthor Commented:
Edited text of question
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ViperOneCommented:
16.168.80.0 is your network address
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rbrCommented:
16.168.80.0 is not a valid IP adress. Its the address of your whole network.
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rajeshrubAuthor Commented:
It's o.k but why i am able to ping 16.168.80.255 . This is an broadcast address.
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rbrCommented:
This is strange. I can't ping my broadcast address.
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rajeshrubAuthor Commented:
why i am able to ping broadcast address ?

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hugheiaCommented:
Youve either set up a device wrongly or some equipment is misbehaving. To find the culprit:

(in a dos box) ping the address
then type (with a capital "A") arp -A
this will give you a MAC address for the ip number you can then deduce the manufacturer of the offending eqipment from the first few characters. You'll have manually compare this mac address with all your equipment.

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AkanwarCommented:
It is not the broadcast address 16.168.80.255 but 16.255.255.255, is so u are able to ping first one.But u should be able to ping 16.168.80.0 also.
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rajeshrubAuthor Commented:
Hello

i have tried your option after that following out i have received

(a) ping 16.168.80.255
after ping four times i ran Arp -A command . Following was the output..

internet address :- 16.168.80.10
physical address:-aa-00-04-00-bc-5b
type :- dynamic

Note that 16.168.80.10 is our office VAX/VMS server address.

We are also using Windows nt 4.0 server here on which dhcp server is installed. One main thing i have noticed that if i run Ping 16.168.80.255 from machine which is getting ip address from dhcp server then arp -A produces internet address 16.168.80.1

16.168.80.1 is our gateway address.

From this output. i am really confused .Pls. help me...

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hugheiaCommented:
are you pinging a machine on the same subnet. if not, the packets travels via the router. Is your subnet mask correct?
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mfa073198Commented:
I'd love to know how this worked out.  If your subnet mask is, as you said, 255.0.0.0, then your network address is 16.0.0.0, and the broadcast address is 16.255.255.255, as Akanwar pointed out above.  Then 16.168.80.255 and 16.168.80.0 are just valid hostid's.

FYI, I have a Class C address (subnet mask is 255.255.255.0) and I am able to ping my broadcast address just fine, but get an invalid address message when I try to ping the network address.  I'm not sure where the ping response is coming from; no arp cache entries are stored.
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