NetWare/IP Domain Name and Information

When NWIP_EXIST_IN_SNAME_FILE is used, options 62 and 63 are placed in the area covered by the DHCP 'sname' and 'file' fields. Option 63 in the 'options' area is a stub with length 2 pointing to the sname/file area; the full sub-option data appears only in sname/file.

If NSQ_BROADCAST sub-option value is 1, the client SHOULD perform a NetWare Nearest Server Query to find its nearest NetWare/IP server.

If NWIP_1_1 sub-option value is 1, the NetWare/IP client SHOULD support NetWare/IP Version 1.1 compatibility.

One and only one of the four status sub-options (NWIP_DOES_NOT_EXIST, NWIP_EXIST_IN_OPTIONS_AREA, NWIP_EXIST_IN_SNAME_FILE, NWIP_EXIST_BUT_TOO_BIG) MUST be the first sub-option present in option 63 encoding.

DHCP option 62 carries the NetWare/IP Domain Name as an NVT ASCII string. The option code is 62, maximum length is 255, and the string length is inferred from the 'len' field.

dns

DHCP option 63 carries NetWare/IP information (all NetWare/IP data except the domain name) as a set of sub-options. The option code is 63, maximum length is 255, and each sub-option contains a one-byte code, one-byte length, and optional value field.

Sub-option AUTORETRIES (code 8) has length 1 and a one-byte integer indicating how many times a NetWare/IP client should attempt to communicate with a given DSS server at startup.

Sub-option AUTORETRY_SECS (code 9) has length 1 and a one-byte integer indicating the delay in seconds between each NetWare/IP client attempt to communicate with a given DSS server at startup.

Sub-option NEAREST_NWIP_SERVER (code 7) contains an array of up to 5 IPv4 addresses (each 4 bytes) of the nearest NetWare/IP servers. Maximum length is 20 bytes.

Sub-option NSQ_BROADCAST (code 5) has length 1; a value of 1 indicates the client SHOULD perform a NetWare Nearest Server Query to find its nearest NetWare/IP server.

Sub-option NWIP_1_1 (code 10) has length 1; a value of 1 indicates the NetWare/IP client SHOULD support NetWare/IP Version 1.1 compatibility, required only when contacting a v1.1 server.

Sub-option NWIP_DOES_NOT_EXIST (code 1) indicates the responding DHCP server has no NetWare/IP information configured. It is a type-length pair with length set to zero.

Sub-option NWIP_EXIST_BUT_TOO_BIG (code 4) indicates neither the 'options' area nor 'sname' field can accommodate the NetWare/IP information.

Sub-option NWIP_EXIST_IN_OPTIONS_AREA (code 2) indicates all NetWare/IP information is present in the 'options' area of the DHCP response packet. It is a type-length pair with length set to zero.

Sub-option NWIP_EXIST_IN_SNAME_FILE (code 3) indicates all NetWare/IP information is present in the 'sname' and, if necessary, 'file' fields of the DHCP response. Within the 'options' area, option 63 appears with length 2, first byte set to NWIP_EXIST_IN_SNAME_FILE and second byte zero.

Sub-option PREFERRED_DSS (code 6) contains an array of up to 5 IPv4 addresses (each 4 bytes) of NetWare Domain SAP/RIP Servers (DSS). Maximum length is 20 bytes.

Sub-option PRIMARY_DSS (code 11) has length 4 and contains a single IPv4 address identifying the Primary Domain SAP/RIP Service server (DSS) for the NetWare/IP domain.

DHCP provides no authentication or security mechanisms. Unauthorized DHCP servers can use NetWare/IP options 62 and 63 to misconfigure NetWare/IP clients with potentially disruptive information.

security

Option 62 encoding: code byte (62), length byte (n), followed by n ASCII character bytes representing the NetWare/IP domain name.

Option 63 sub-options are encoded sequentially: each sub-option has a one-byte code, one-byte length, and variable-length value. The option 63 'len' field covers the total length of all sub-option code, length, and value bytes.