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This command validates if exist any character different in 0-255 and dot.
If any characters different is typed the error menssage is showing.
This command will disable a guest user logon, this user don't have password to login in the system.
When you block any hosts using this method, the hosts can't do anything in the network.
The block is applied on firewall or gateway of the network.
This command solve the problem ping: sendmsg: No buffer space available to.