Chapter 10 Interfaces
ZyWALL USG Series User’s Guide
330
The following table lists the available DHCP extended options (defined in RFCs) on the Zyxel Device. See
RFCs for more information.
Code This field displays the code number of the selected DHCP option. If you selected User Defined
in the Option field, enter a number for the option. This field is mandatory.
Type This is the type of the selected DHCP option. If you selected User Defined in the Option field,
select an appropriate type for the value that you will enter in the next field. Only advanced
users should configure User Defined. Misconfiguration could result in interface lockout.
Value Enter the value for the selected DHCP option. For example, if you selected TFTP Server Name
(66) and the type is TEXT, enter the DNS domain name of a TFTP server here. This field is
mandatory.
First IP Address,
Second IP
Address, Third IP
Address
If you selected Time Server (4), NTP Server (41), SIP Server (120), CAPWAP AC (138), or TFTP
Server (150), you have to enter at least one IP address of the corresponding servers in these
fields. The servers should be listed in order of your preference.
First Enterprise ID,
Second Enterprise
ID
If you selected VIVC (124) or VIVS (125), you have to enter at least one vendor’s 32-bit
enterprise number in these fields. An enterprise number is a unique number that identifies a
company.
First Class, Second
Class
If you selected VIVC (124), enter the details of the hardware configuration of the host on
which the client is running, or of industry consortium compliance.
First Information,
Second
Information
If you selected VIVS (125), enter additional information for the corresponding enterprise
number in these fields.
OK Click this to close this screen and update the settings to the previous Edit screen.
Cancel Click Cancel to close the screen.
Table 111 DHCP Extended Options
OPTION NAME CODE DESCRIPTION
Time Offset 2 This option specifies the offset of the client's subnet in seconds from Coordinated
Universal Time (UTC).
Time Server 4 This option specifies a list of Time servers available to the client.
NTP Server 42 This option specifies a list of the NTP servers available to the client by IP address.
TFTP Server Name 66 This option is used to identify a TFTP server when the “sname” field in the DHCP
header has been used for DHCP options. The minimum length of the value is 1.
Bootfile 67 This option is used to identify a bootfile when the “file” field in the DHCP header
has been used for DHCP options. The minimum length of the value is 1.
SIP Server 120 This option carries either an IPv4 address or a DNS domain name to be used by
the SIP client to locate a SIP server.
VIVC 124 Vendor-Identifying Vendor Class option
A DHCP client may use this option to unambiguously identify the vendor that
manufactured the hardware on which the client is running, the software in use, or
an industry consortium to which the vendor belongs.
VIVS 125 Vendor-Identifying Vendor-Specific option
DHCP clients and servers may use this option to exchange vendor-specific
information.
Table 110 Configuration > Network > Interface > Ethernet > Edit > Add/Edit Extended Options
LABEL DESCRIPTION
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