RFC 1048 (rfc1048) - Page 3 of 7

BOOTP vendor information extensions

RFC 1048                    BOOTP Extensions               February 1988


            required by the target machine (i.e., 32-bit quantities such
            as IP addresses on 32-bit boundaries).

         Subnet Mask Field (Tag: 1, Data: 4 subnet mask bytes)

            Specifies the net and local subnet mask as per the standard
            on subnetting [RFC-950].  For convenience, this field must
            precede the GATEWAY field (below), if present.

         Time Offset Field (Tag: 2, Data: 4 time offset bytes)

            Specifies the time offset of the local subnet in seconds
            from Coordinated Universal Time (UTC); signed 32-bit
            integer.

         End Field (Tag: 255, Data: None)

            Specifies end of usable data in the vendor information area.
            The rest of this field should be filled with PAD zero)
            octets.

      Variable Length Data

         The variable length data has a single format; it consists of
         one tag octet, one length octet, and length octets of data.

         Gateway Field (Tag: 3, Data: N address bytes)

            Specifies the IP addresses of N/4 gateways for this subnet.
            If one of many gateways is preferred, that should be first.

         Time Server Field (Tag: 4, Data: N address bytes)

            Specifies the IP addresses of N/4 time servers [RFC-868].

         IEN-116 Name Server Field (Tag: 5, Data: N address bytes)

            Specifies the IP addresses of N/4 name servers [IEN-116].

         Domain Name Server Field (Tag: 6, Data: N address bytes)

            Specifies the IP addresses of N/4 domain name servers RFC-
            883].

         Log Server Field (Tag: 7, Data: N address bytes)

            Specifies the IP addresses of N/4 MIT-LCS UDP log server
            [LOGGING].



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