Question:  I'm in the process of installing a new Eclipse Median frame and when I select the Change IP address option and it is telling me DHCP is enabled so I uncheck it and put in a static IP address (169.254.0.100) and apply it.  The System resets and I can download to it, it turns green in the layout screen and I can ping it but it will not connect the event log, it doesn’t even get the “Ack” message. Instead I get the message saying it cannot open that address.  I recheck the IP Address settings again and it shows that DHCP is still checked.  Pressing the ENG button on the active processor card shows that DHCP is enabled as well.  I've double checked all of the Subnet Masks to make sure they are correct/  I have tried unchecking the DHCP tick box multiple times now but it doesn’t seem to want to uncheck.  What am I missing?
Answer:  The following steps will need to be completed to set up a new Omega or Median matrix:

• From the System > layout screen right mouse click on the matrix icon and select the Change IP address option
  
• Un-check the DHCP check box and enter in a static IP address <NOT in the 169.x.x.x range) .Either enter the IP address as provided by your IT dept, or use an IP address like 192.168.42.150 .. subnet mask 255.255.255.0
• Press the TICK to accept the changes. Your matrix will reset and come up with the new IP address you have set . 
  
• Change your laptop IP address to use a similar (BUT NOT the same) IP address as set for the matrix. 

Example: Matrix IP address = 192.168.42.150 , then set you Laptop IP address to be 192.168.42.140

•  Ensure the subnet mask on your PC matches that subnet mask of the matrix. IF they are not the same, some functions will not operate and the ability of changing your rack from DHCP to static is one of those
  

•   Note: Resetting the matrix to the factory default will reset the matrix IP address to 169.254.0.100.  
This IP address is a specially reserved IP address. often referred to as a link local IP address which means that a PC connected directly to the matrix using an ethernet cable, but in DHCP mode, will be able to the communicate with the rack. When the rack's IP configuration is defaulted back to the above link local address it also defaults to DHCP enabled so it is not possible to use a static IP address in the 169.254.x.x range. 
NOTE:  Definition of a Link-Local IP Address:
A link-local address is an Internet Protocol address that is intended only for communications within the segment of a local network (a link) or a point-to-point connection that a host is connected to. Routers do not forward packets with link-local addresses.
Link-local addresses may be assigned manually by an administrator or by operating system procedures. Most often they are assigned using stateless address auto configuration. In IPv4,they are normally only used to assign IP addresses to network interfaces when no external, stateful mechanism of address configuration exists, such as the Dynamic Host Configuration Protocol (DHCP) or when another primary configuration method has failed.
Link-local addresses for IPv4 are defined in the address block 169.254.0.0/16, in CIDR notation.