N

NAMESERVER1, NAMESERVER2
The dhcp.client passes these environment variables to the /etc/dhcp/dhcp-up script. They indicate the nameservers that the client is to use.
NAME_MAX
The maximum permitted length of a component of a pathname.
NETMASK
The dhcp.client passes this environment variable to the /etc/dhcp/dhcp-up script. It indicates the client netmask that was obtained from the server.