DHCP 配置说明

Site Option Space
StasБайду номын сангаас Agent Options
Update Optimization
Update Static Leases
Use Lease for Default Route
One Lease Per Client
Allow MAC Pools
Sets the site option space for a given DHCP scope. This option is only useful in combination with deployment of an option space definition in a DHCP Raw option. This checkbox causes the client to include the DHCP agent information from the initial DHCPREQUEST message in all subsequent messages. When selected, the DHCP server only attempts a DDNS update if it appears that client information has changed, rather than every time the client’s lease is renewed. When enabled, the DHCP server will also perform DDNS updates for static (DHCP Reserved) leases. When selected, the client’s own IP address is sent as the router address rather than the actual address of the gateway. This can make some Windows clients ARP for all IP addresses if the router is set up for proxy ARP. When selected, the server clears all existing leases for a client upon the receipt of a new DHCPREQUEST message. This ensures that an interface obtains only one lease at a time for a segment. Allows the selected MAC Pool access to DHCP services. After this option is set, MAC addresses not belonging to the selected MAC Pool are automatically denied. Multiple instances of this option may be added, to allow DHCP service to members of multiple MAC Pools.
Always Reply (RFC 1048)
Dynamic BOOTP Lease Length
File Name
Get Lease Hostnames
Minimum Seconds
Next Server Server Identifier
Indicates that the server should always reply with RFC 1048-style responses. This is true even if clients do not make RFC 1048-style requests. Indicates the lease length after which a BOOTP client is assumed to be offline. Specified as an integer value between 0 to 4,294,967,295 seconds. The values can be set in seconds, minutes, hours or days. The name of the initial boot file which is to be loaded by a client. Boot files are generally made available to clients by TFTP. When selected, the server looks up the domain name for each client and uses the information from the zone to set the hostname option for the client. Specifies the amount of time that the DHCP server waits before responding to client requests. A setting of 1 always results in the second request being answered rather than the first. This is useful for setting up a secondary DHCP server that allows the primary to respond to the first request. Specified as an integer from 0 to 255. Specifies the server where the boot file is located. Overrides the value that is sent to clients in the DHCP Server Identifier option. This must be a valid IP address already assigned to the DHCP server. This value is usually set automatically; using this option is not recommended.
DHCPv4 Service Option Default Lease Time Maximum Lease Time
Minimum Lease Time
Client Updates
DDNS Domain Name
DDNS Host Name
Description Specifies the default lease time that will be offered to DHCP clients. Specifies the longest possible lease time that will be granted to a DHCP client. Specifies the shortest possible lease time that will be granted to a DHCP client. Indicates whether client updates should be used to maintain DDNS records for this client. When selected, the client updates its own DNS record on the server. When not selected, the DHCP server performs the update. This option is required for DHCP to perform DDNS updates. Specifies the domain name appended to this client’s hostname to form the fullyqualified DNS name that will be dynamically updated by the DHCP server. Specifies the hostname that should be used for DDNS updates for this client. If no value is specified, the hostname provided by the DHCP client will be used. In the General section, define the following parameters: Type—select the type to be used as part of a DDNS hostname value: IP Address or MAC Address. Position—specify where you wish to add the data value to the IP address or MAC address to create the DDNS hostname. Select Prepend to add the data value specified in the Data field in front of the IP address or MAC address. Select Append to add the data value specified in the Data field at the end of the IP address or MAC address.
DDNS Reverse Domain Name
DDNS TTL
DDNS Updates
Ping Check
Always Broadcast
Data—specify data value that will be used to be prepended or appended to the IP address or MAC address to form the DDNS hostname. Specifies the domain name appended to the client's (reversed) IP address to form the fully-qualified reverse DNS name. By default, this value is inaddr.arpa. Specifies the default TTL for DDNS records, specified as an integer value from 0 to 4,294,967,295 seconds. The values can be set in seconds, minutes, hours or days. Indicates whether the server should attempt a DDNS update when the lease is acknowledged by the DHCP client. When the Enabled check box is selected, the DHCP server updates DNS records on the DNS server. NOTE: DDNS Updates are enabled by default in Proteus and this can cause a slow or unresponsive DHCP service because the DHCP service runs in a single thread leading all DHCP lease updates are processed serially. In order to avoid this issue, disable DDNS Updates manually. Indicates whether the server should use an ICMP “ping” to ensure that only inactive IP addresses are offered to DHCP clients. By default, Ping Check is globally enabled. Sets the server to always broadcast its responses to compensate for some clients that would not otherwise receive responses.