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B-5
User Guide for Cisco Network Registrar, 7.1
OL-16002-01
Part 6 : Appendices, Glossary, and Index Appendix B DHCP Options
Option Descriptions
TCP Parameters
Table B-5 lists the options that affect the operation of the TCP layer on a per-interface basis.
Application and Service Parameters
Table B-6 lists some miscellaneous options used to configure miscellaneous applications and services.
ARP Cache
Timeout 35 4 octets Timeout in seconds for ARP cache entries.
Ethernet
Encapsulation 36 1 octet Specifies whether or not the client should use Ethernet Version 2 (RFC
894) or IEEE 802.3 (RFC 1042) encapsulation if the interface is an
Ethernet.
Value: 0=use RFC 894 encapsulation; 1=use RFC 1042 encapsulation
Table B-4 Link Layer Parameters Per Interface Options (continued)
Option Name No. Length Description
Table B-5 TCP Parameter Options
Option Name No. Length Description
TCP Default
TTL 37 1 octet Default TTL that the client should use when sending TCP segments.
Value: minimum 1
TCP Keepalive
Interval 38 4 octets Interval (in seconds) that the client TCP should wait before sending a
keepalive message on a TCP connection. The time is specified as a
32-bit unsigned integer. A value of zero indicates that the client should
not generate keepalive messages on connections unless specifically
requested by an application. Value: 32-bit unsigned; 0=do not generate
keepalive messages unless specifically requested.
TCP Keepalive
Garbage 39 1 octet Specifies the whether or not the client should send TCP keep-alive
messages with an octet of garbage for compatibility with older
implementations.
Values: 0=do not send; 1=send
Table B-6 Application and Service Parameter Options
Option Name No. Length Description
Network
Information
Service (NIS)
Domain 40 1 octet minimum Name of the client NIS domain. The domain is formatted
as a character string consisting of characters from the NVT
ASCII character set.
Network
Information
Service (NIS)
Servers 41 4 octet minimum;
multiples of 4 List of IP addresses indicating NIS servers available to the
client. Servers should be in order of preference.