Network and Broadcast IP question

[ALIAOF_]

I know these two IP's should not be used as node IP's.  I'm trying to do some research on what would be the exact reason you wouldn't want to use them as I have seen people using them.  What impact it can have on the network?  Especially with using the broadcast IP for a node?

[nkarthikeyan · Accepted solution]

Hi mohammad,

You cannot use your network id. If you try to use the network id as an ip address. for eg you will be getting the below error.

I have used 10.0.0.8/29 subnet. Network id is 10.0.0.8 & Broadcast address is 10.0.0.15. between 10.0.0.9-14 is the valid ip address range.

Switch(config-if)#ip address 10.0.0.8 255.255.255.248

Bad mask /29 for address 10.0.0.8

Switch(config-if)#

The same result for broadcast IP address. See the below result for broadcast address.

Switch(config-if)#ip address 10.0.0.15 255.255.255.248

Bad mask /29 for address 10.0.0.15

Switch(config-if)#

You can use /32 ip address for say 10.0.0.255 255.255.255.255 as a loop back. But other than that it will cannot be used anyother way.

Please do rate if the given information helps.

By

Karthik