ACCESS GATEWAY
70 Installing the Access Gateway
The following DHCP option codes are supported:
Disallowed options
: Some option codes are not allowed, for one of the following reasons:
Items that are already configured elsewhere as a separate DHCP pool or NSE
configuration parameter, and/or are derived from one that is. Includes options 1
(subnet mask), 3 (router), 6 (domain name server), 15 (domain name), 51 (lease time),
54 (server identifier), 58 (renewal time), 59 (rebinding time).
Items not valid in a DHCP offer or ACK message. Includes options 50 (requested IP
address), 55 (parameter request list), 56 (error message), 57 (maximum message size),
60 (vendor class identifier), 61 (client identifier).
Items generated automatically by the mechanism of DHCP message construction,
which carry no application information. Includes options 0 (pad), 52 (option
overload), 53 (DHCP message type), 255 (end).
Unrecognized options
: Options 62-63, 77-254 are unrecognized. Some of these codes are
legitimate and are defined in other RFCs, while others are not defined. These option codes are
not explicitly disallowed on the NSE, but the NSE is “unaware” of them – that is, it will make
no attempt to validate either the code or the data. It is the administrator’s responsibility to
ensure that the option codes and data entered are legitimate.
Option Description Option Code
Single IP address 16, 28, 32
List of one or more IP addresses 3-5, 7-11, 41-42, 44-45, 48-49, 65, 69-76
List of zero or more IP addresses 68
List of one or more pairs of IP addresses (or
address/mask pairs)
21, 33
32-bit unsigned integer value 2, 24, 35, 38
16-bit unsigned integer value 13, 22, 26
8-bit unsigned integer value 23, 37, 46
List of 1 or more 16-bit unsigned integer values 25
Single octet Boolean (value may be 1 or 0) 19-20, 27, 29-31, 34, 36, 39
Sequence of 1 or more octets 43
Ascii string of 1 or more printable characters 12, 14, 17-18, 40, 47, 64, 66-67
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