Mysterious ping ....

[abarzaq]

I have the network 10.192.2.0 subnetmask 255.255.255.0
When I make a ping 10.192.2.255 OR a ping 10.192.2.0 , all the unix Machines and Routers on this subnet are responding .
Can someone tell me why the ping 10.192.2.0 has the same behaviour than the "real and good" broadcast address 10.192.2.255 ??

Thanks for your help .

Regards .

AB

 

[andrewalx]

Hi.
Old TCP/IP versions consider all zeros as multicast too.

 

[talisker]

I believe that adding "ip subnet-zero" to the router config. will prevent 10.192.2.0 from being a broadcast address - at least as far as the router is concerned.

 

[fynx]

ip subnet-zero allows IOS to violate RFC1122.

 

[8dstaicu]

Some SUN Solaris did have broadcast address ending with all 0.