General Options Option 1 (Subnet Mask) Description The subnet mask option specifies the client's subnet mask as per RFC 950. If both the subnet mask and the router option are specified in a DHCP reply, the subnet mask option MUST be first. The code for the subnet mask option is 1, and its length is 4 octets. VALIDVALUE e.g. 255.255.0.0 SETTING netmask Option 3 (Router) Description The router option specifies a list of IP addresses for routers on the client's subnet. Routers SHOULD be listed in order of preference. The code for the router option is 3. The minimum length for the router option is 4 octets, and the length MUST always be a multiple of 4. VALIDVALUE e.g. 192.168.0.1 SETTING gateway Option 4 (Time Server) Description The time server option specifies the time server (RFC 868), available to the client. The code for the time server option is 4. The minimum length for this option is 4 octets, and the length MUST always be a multiple of 4. Time Server is mapped to NTP Server. Available since 8.5.1 VALIDVALUE 192.53.103.103, de.pool.ntp.org SETTING ntp_server Option 6 (DNS Server) Description The domain name server option specifies a list of Domain Name System (STD 13, RFC 1035) name servers available to the client. Servers SHOULD be listed in order of preference. The code for the domain name server option is 6. The minimum length for this option is 4 octets, and the length MUST always be a multiple of 4. VALIDVALUE Private: 192.168.0.9 Public: 174.129.1.129 SETTING dns_server1 dns_server2 Option 12 (Hostname) Description This option specifies the name of the client. The name may or may not be qualified with the local domain name (see section 3.17 for the preferred way to ret...
