DHCP server options
A FastIron device configured as a DHCP server can support up to 500 DHCP clients.
The list of supported DHCP options is shown in the following table:
| Code | Option Name | Description |
|---|---|---|
| 1 | Subnet Mask | Specifies the client subnet mask (per RFC 950). |
| 3 | Router Option | Specifies a list of IP addresses for routers on the client subnet. Routers are listed in order of preference.
NOTE Option 3 is not supported on non-default VRFs and management VRFs.
NOTE Option 3 functions only when there is no previously configured route on the DHCP client. If the route received by the DHCP client from the DHCP server is already configured on the client, the following syslog message is displayed: DHCPC: Failed to configure default gateway.
|
| 6 | Domain Name Server | Specifies a list of Domain Name System (RFC 1035) name servers available to the client. Servers are listed in order of preference. |
| 12 | Hostname | Configures the host name that can be assigned to the DHCP clients. |
| 15 | Domain name | Specifies the domain name the client should use when resolving host names using the Domain Name System. |
| 47 | NetBIOS over TCP/IP Name Server | Specifies a list of RFC1001/1002 NBNS name servers listed in order of preference. |
| 49 | X Window System Display Manager | Configures the IP addresses of X Window System Display Managers which can be used by DHCP clients that support the X Window system. |
| 66 | TFTP server hostname or IP address | Configures the address or name of the TFTP server available to the client. |
| 67 | Boot File name | Specifies a boot image to be used by the client. |
| Next Bootstrap Server | Configures the IP address of the next server to be used for startup by the client. | |
| 176 and 242 | Avaya IP Telephone (46xx and 96xx) parameters | Configures the IP telephone parameters for Avaya IP phones running as DHCP clients. |
| 252 | Proxy-Auto Config (PAC) | Configures the PAC file location string for the Web Proxy Auto-Discovery WPAD-supported DHCP clients. |
| 60 | Vendor-Specific Information | Allows clients and servers to exchange vendor-specific information. |
A DHCP server assigns and manages IPv4 addresses from multiple address pools, using dynamic address allocation. The DHCP server also contains the relay agent to forward DHCP broadcast messages to network segments that do not support these types of messages.