VXI EX7000 - Manual (Page 29)

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EX7000 Series Web Page Operation 29
N ETWORK C ONFIGURATION
The EX7000 Network Configuration page can be seen in Figure 4-5. By default, the EX7000 will
attempt to locate a DHCP server. If one is found, the IP address assigned by the DHCP server will
be assumed, along with subnet masks, gateway, etc. Otherwise, after a timeout of 20 seconds, the
unit will attempt to obtain an IP address by using AutoIP (IPv4 Dynamic Link Local Addressing).
NOTE The EX7000 can be returned to a known, default network configuration by using the LCI (LAN
Configuration Initialize) Mechanism. See Reset Button for more information.
AutoIP is a mechanism for finding an unused IP address in the IANA assigned range 169.254.X.Y
(169.254/16) where X is in the range 1 - 254 and Y is in the range 0 - 255. The device will first
attempt to obtain the specific address 169.254.X.Y, where X and Y are the second-to-last and last
octets of the device’s MAC address. However, X will be set to 1 if it is 0 in the MAC address, and
to 254 if it is 255 in the MAC address for conformance with the AutoIP specifications. If this
address is already in use, the unit will attempt to obtain other IP addresses in the 169.254/16 range
in a pseudorandom fashion until it finds one that is available.
To illustrate the AutoIP mechanism, Table 4-1 lists the AutoIP default address for some example
MAC addresses.
MAC Address AutoIP Default Address
00:0D:3F:01:00:01 169.254.1.1
00:0D:3F:01:01:01 169.254.1.1
00:0D:3F:01:A3:28 169.254.163.40
00:0D:3F:01:FE:FE 169.254.254.254
00:0D:3F:01:FF:FE 169.254.254.254
T ABLE 4-1: A UTO IP D EFAULT A DDRESS A SSIGNMENT
If a static IP address assignment is preferred, one can be optionally assigned via the embedded
web page interface. This is done by clicking the Network Configuration link, disabling DHCP
and AutoIP, enabling Static, and then assigning a static IP address, subnet mask, and gateway
address, and, optionally, up to three DNS servers (see Figure 4-5).