Issue
Webhelp and the Technical Reference Guide supply information for using the AS-P/B DHCP server option, however, a number of relevant questions have not been answered.
Product Line
EcoStruxture Building Operation
Environment
- Building Operation Automation Server Premium (AS-P 0.62 hardware)
- Building Operation Automation Server Bundled (AS-B)
- Building Operation SmartX IP Multi-purpose Controller (MP-X)
- Building Operation SmartX IP Room Controller (RP-C)
- Building Operation SmartX Controller IP-IO Series
Cause
There are typically a number of options to configure DHCP servers, but since the DHCP server included with the AS-P/B is very basic and NOT configurable, it's important to understand which options are and are not available.
Resolution
Webhelp has some helpful information about the DHCP Server Options.
The AS-P/Bs built-in DHCP server assigns unrouted IP addresses within the range of addresses from 10.110.210.2 to 10.110.210.254. This was developed to allow for a quick configuration of a private MP-X/RP-C network.
The AS-P/B DHCP server can be disabled and another DHCP server can be used.
Here is a list of other questions and answers that may come up based on typical options in other DHCP servers:
- Can the scope of the IP range be configured?
There is no way to configure or limit the range of the standard IP address range or to have multiple scopes. - Can IP exceptions be configured?
There is no configuration option to prevent the AS-P/B DHCP server from assigning a specific IP address. The AS-P/B DHCP server is unaware of static IP addresses, so if a switch or other device has a static IP set in the 10.110.210.2 to 10.110.210.254 range, you run the risk of having the AS-P/B DHCP server assign an IP address twice which can cause a number of issues. - Can a Default gateway be configured?
Not configurable - Can a Subnet mask be configured?
Not configurable - Is IP6 supported?
No - Can lease types be configured?
No - Can multiple DHCP servers be installed on the private LAN?
No - Should MP-X/RP-C IP level devices only be hosted within the private AS-P/B network?
Most site IT departments prefer that the BAS networks be isolated, however, if the network switch (Not the AS-P/B) is used for assigning DHCP IP addresses, it could hand out addresses to the AS-P/B and the MP-X/RP-C devices if they are on the same subnet.
A managed (RSTP Enabled) switch can reside as a client to the AS-P/B. This is due to how the Private DHCP option is advertised. On-site IT departments may not want the switch on the customer's LAN so it is placed in the private AS-P/B network. - Does the AS-P/B DHCP server assign addresses to 3rd party devices?
Yes, if the 3rd party device supports this. This would be a configurable option in the device.
