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4.5 KiB
4.5 KiB
| ID | Option Name | Type | Array | Length | Description |
| Standard Options | |||||
| 0 | Pad | Generated | - | 1 | Pad byte generated to align other data? |
| 255 | End | Generated | - | 1 | Indicates end of options in DHCP packet |
| 1 | Subnet Mask | IP Addr | - | 4 | Subnet mask in network byte order |
| 2 | Time Offset | Long | - | 4 | UCT offset in seconds |
| 3 | Router | IP Addr | Y | 4 | Array of router addresses ordered by preference |
| 4 | Time Server | IP Addr | Y | 4 | Array of time server addresses, by preference |
| 5 | Name Servers | IP Addr | Y | 4 | Array of name servers, by preference |
| 6 | DNS Servers | IP Addr | Y | 4 | Array of DNS servers, by preference |
| 7 | Log Servers | IP Addr | Y | 4 | Array of MIT_LCS UDP log servers on subnet |
| 8 | Cookie Servers | IP Addr | Y | 4 | Array of cookie servers, RFC 865 |
| 9 | LPR Servers | IP Addr | Y | 4 | Array of RFC 1179 servers, by preference |
| 10 | Impress Servers | IP Addr | Y | 4 | Array of Imagen Impress servers |
| 11 | Resource Location Servers | IP Addr | Y | 4 | Array of RFC 887 ResLoc servers on subnet, pref |
| 12 | Host Name | String | - | dyn | Host name for client, RFC 1035 character set |
| 13 | Boot File Size | Short | - | 2 | Size of boot image file in 512-octet blocks |
| 14 | Merit Dump File | String | - | dyn | Path name for crash dump file |
| 15 | Domain Name | String | - | dyn | Domain name for client resolutions |
| 16 | Swap Server | IP Addr | - | 4 | Address of client's swap server |
| 17 | Root Path | String | - | dyn | Path name for client's root disk, char set NVT ASCII |
| IP Layer Parameters | |||||
| 18 | Extensions Path | String | - | dyn | tftp file for option extensions |
| 19 | IP Layer Forwarding | Boolean | - | 1 | Dis/enable IP packet forwarding on this client |
| 20 | Non-local Source Routing | Boolean | - | 1 | Dis/enable non-local datagrams |
| 21 | Policy Filter Masks | IP Pairs | Y | 8 | Destination/mask IP address pairs to filter source routes |
| 22 | Max DG Reassembly Size | Short | - | 2 | Maximum size datagram for reass. by client; max 576 |
| 23 | Default Time-to-live | Octet | - | 1 | Default TTL for client's use on outgoing DGs |
| 24 | Path MTU Aging TO | Long | - | 1 | TO in secs for aging Path MTU values; RFC 1191 |
| 25 | Path MTU Plateau Table | Short | Y | 2 | MUT discovery sizes, sorted by size, all >= 68 |
| IP Per-interface Params | |||||
| 26 | MTU Option | Short | - | 2 | MTU discovery size, >= 68 |
| 27 | All subnets are local | Boolean | - | 1 | Client assumes that all subnets are local v/v MTU |
| 28 | Broadcast Address | IP Addr | - | 4 | Broadcast address |
| 29 | Perform Mask Discovery | Boolean | - | 1 | Client should use ICMP for subnet mask discovery |
| 30 | Mask Supplier Option | Boolean | - | 1 | Client should respond to subnet mask requests via ICMP |
| 31 | Perform Router Discovery | Boolean | - | 1 | Client should solicit routers using RFC 1256 |
| 32 | Router Solicitation Address | IP Addr | - | 4 | Address to use for router solicitation |
| 33 | Static Route Option | IP Pairs | Y | 8 | Destination/router address pairs, in priority order |
| Link Layer Per-I/FParams | |||||
| 34 | Trailer Encapsulation | Boolean | - | 1 | Client should negotiate use of trailers (RFC 983) |
| 35 | ARP Cache Timeout | Long | - | 4 | T/O in seconds for ARP cache entries |
| 36 | Ethernet Encapsulation | Boolean | - | 1 | 0=>client should use ENet V2; 1=> IEEE 802.3 |
| TCP Parameters | |||||
| 37 | Default TTL Option | Octet | - | 1 | Default TTL |
| 38 | Keepalive Interval | Long | - | 4 | K/A T/O in seconds |
| 39 | Keepalive Garbage | Boolean | - | 1 | Send garbage octect |
| Appliation Layer Params | |||||
| 40 | NIS Domain Name | String | - | dyn | Name of Network Information Service domain |
| 41 | NIS Servers | IP Addr | Y | 4 | Addresses of NIS servers on client's subnet |
| 42 | NTP Servers | IP Addr | Y | 4 | Addresses of Network Time Protocol servers |
| Vendor-specific Info | |||||
| 43 | Vendor Specific Info | Binary | Y | dyn | Embedded vendor-specific options |
| NetBIOS Over TCP/IP | |||||
| 44 | WINS/NBNS Servers | IP Addr | Y | 4 | NBNS Address(es) in priority order |
| 45 | NetBIOS over TCP/IP NBDD | IP Addr | Y | 4 | NetBIOS over TCP/IP NBDD address(es) in priority order |
| 46 | WINS/NBT Node Type | Octet | - | 1 | 0x1 = B-node, 0x2 = P-node, 0x4 = M-node, 0x8 = H-node |
| 47 | NetBIOS Scope ID | String | - | dyn | NetBIOS over TCP/IP Scope ID |
| 48 | X Window System Font | IP Addr | Y | 4 | Array of X Windows font servers |
| 49 | X Window System Display | IP Addr | Y | 4 | Array of X Windows Display Mgr servers |
| DHCP Extensions | |||||
| 51 | Lease | Long | - | 4 | Client IP address lease time in seconds. |
| 58 | Renewal (T1) Time Value | Long | - | 4 | Time between addr assignment to RENEWING state |
| 59 | Rebinding (T2) Time Value | Long | - | 4 | Time from addr assignment to REBINDING state |
| 64 | Network Information Service | String | - | dyn | The name of the client's NIS+ domain. Must be at lease one character. |
| 65 | Network Information Server | IP Addr | Y | 4 | A list of IP addresses indicating NIS+ servers available to the client. |
| 66 | Boot Server Host Name | String | - | dyn | TFTP boot server host name |
| 67 | Bootfile Name | String | - | dyn | Bootfile Name |
| 68 | Mobile IP Home Agents | IP Addr | Y | 4 | Mobile IP home agents in priority order |