IP Configuration
DHCP Server
298 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version)
17
- Hybrid—A hybrid combination of b-node and p-node is used. When
configured to use h-node, a computer always tries p-node first and uses
b-node only if p-node fails. This is the default.
- Mixed—A combination of b-node and p-node communications is used to
register and resolve NetBIOS names. M-node first uses b-node; then, if
necessary, p-node. M-node is typically not the best choice for larger
networks because its preference for b-node Broadcasts increases
network traffic.
- Peer-to-Peer—Point-to-point communications with a NetBIOS name
server are used to register and resolve computer names to IP addresses.
- Broadcast—IP Broadcast messages are used to register and resolve
NetBIOS names to IP addresses.
• SNTP Server IP Address (Option 4)— Select one of the device’s SNTP
servers (if already configured) or select Other and enter the IP address of
the time server for the DHCP client.
• File Server IP Address (siaddr)—Enter the IP address of the TFTP/SCP
server from which the configuration file is downloaded.
• File Server Host Name (sname)—Enter the name of the TFTP/SCP server.
• Configuration File Name (file)—Enter the name of the file that is used as a
configuration file.
DHCP Options
When the device is acting as a DHCP server, the DHCP options can be configured
using the HEX option. A description of these options can be found in RFC2131.
The configuration of these options determines the reply that is sent to DHCP
clients whose packets include a request (using option 55) for the configured DHCP
options.
The options that are configured specifically on the DHCP Server >Network Pools
and the DHCP Server >Static Hosts pages (Option 3-6, 15, 44, 46, 66, 67) cannot
be configured using the DHCP Options page.
Example: The DHCP option 66 is configured with the name of a TFTP server in the
DHCP Options page. When a client DHCP packet is received containing option 66,
the TFTP server is returned as the value of option 66.
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