IFBD-HE0708 BE07 User’s Manual
3-5
3.1.1.5
Transition of Processes in IP Address Acquisition
■ When Static is valid
If Static (fixed address) is set, startup always relies upon the Static condition (fixed address).
In such a case, DCHP/BOOTP, RARP, ARP/Ping become invalid, and startup does not occur.
■ When Static is invalid (default)
If Static (a fixed address) has not been, see the information below for details on the relationships (timing) for starting/stopping
the server that provides the passing of time from the startup of the TCP/IP (*) and dynamic addresses. When the NIC setting is
initialized, operations follow this timing.
Note that there is an error of approximately ±3 in the times disclosed below.
* There are approximately 14 seconds from the time the power is turned on to the startup of the TCP/IP.
<DIPSW1 = OFF (Default)>
DHCP
RARP
ARP/Ping
0
[14]
15
[29]
20
[34]
DHCP/BOOTP Start
DHCPValid Region
RARP Valid Region
→ Time after starting TCP/IP (seconds)
[Lower leve: Time after turning on the power (seconds)]
Ping ARP Start
RARP Start
BOOT Valid Region
BOOTP
Ping ARP Valid Region
The first IP address acquired by either protocol becomes the NIC operating address, and all other protocols are invalid. The details
are outlined below.
The IP address acquired first by either DCHP and BOOTP in the time between 0 to 15 seconds is valid.
When the IP address information is valid during that time, RARP and ARP/Ping do not start.
The IP address acquired first by either DCHP, BOOTP, and RARP in the time between 15 and 20 seconds is
valid.
Addresses provided thereafter from another server are discarded.
When the IP address information is valid during that time, ARP/Ping do not start.
<DIPSW1 = ON>
The DHCHP/BOOTP valid region is an infinite time after TCP/IP startup. If such cases, RARP, and ARP/Ping cannot be used.
If this product is connected directly to an intelligent switch or intelligent hub, the physical link may take some time to become
established. In such cases, a timeout will occur while waiting to get the DHCP/BOOTP address, and it will fail to get the IP address.
In such cases, set DIPSW1 = ON to ignore the IP address acquisition timeout.