To configure TCP/IP settings

At the TCP/IP Configuration step (Figure 18), do the following:

1. Review the Interface 1 settings on the IPv4 Settings tab, which include the temporary factory-shipped IP address.

2. Assign the JACE a unique IPv4 address for the network you are installing it on. No other device on this network should use this same IP address. Include the appropriate subnet mask used by the network.

   Alternatively, if the network supports DHCP, you can enable it (click DHCP Enabled). In this case, the IP Address and Subnet Mask fields become read only.

   In general (for stability), static IP addressing is recommended over DHCP. Do not enable DHCP unless you are certain that the network has DHCP servers! Otherwise, the JACE may become unreachable over the network.

3. Review, and if needed adjust other TCP/IP settings, which (in usual order of importance) include:

   • IPv4 Gateway — The IP address for the device that forwards packets to other networks or subnets.

   • DNS Domain Name —  Enter the name of network domain, or if not applicable, leave blank.

   • DNSv4 Servers —  Click the add button for a field to enter the IPv4 address of one or more DNS servers.

   • Hostname — Default may be “localhost,” or enter another name you want to use for this host.

     In some installations, changing hostname may result in unintended impacts on the network, depending on how the DHCP or DNS servers are configured. If in doubt, leave hostname at default.

   • Hosts File — Click control to expand edit field. Format is a standard TCP/IP hosts file, where each line associates a particular IP address with a known host name. Each entry should be on an individual line. The IP address should be placed in the first column, followed by the corresponding host name. The IP address and the host name should be separated by at least one space.

     1. To add a line, click at the end of the last line and press Enter.

     2. Type in the required data on the new line.

        To return to see all TCP/IP settings, click the control to contract the edit field when done.

4. Click the Next button to go to the next step.

   If commissioning a JACE controller with two Ethernet ports, please note that an “Interface 2” is available, for configuring the LAN2 (secondary) Ethernet port. By default, this port is disabled, that is without a “default” address. Intended usage is for:

   • Isolating a “driver’s” Ethernet traffic from the primary (LAN1) interface, OR

   • In some cases, LAN2 may be set up with a standard, fixed, IP address that is used only by a company’s service technician, when on site. This allows access to the JACE without disconnecting it from the customer’s network, or without connecting the technician’s service PC to the customer’s network (which might go against local IT security policies).

   In any case, note that only one LAN port can be set as DHCP. If enabling LAN2, you typically specify another (network) static IP address and the appropriate subnet mask.

   Also note the following:

   • If enabling both LAN ports, note that the LAN1 IP address and LAN2 IP address must be on different subnets, otherwise the ports will not function correctly.

     For example, with a typical “Class C” subnet mask of 255.255.255.0, setting Interface 1=192.168.1.99 and Interface 2=192.168.1.188 is an invalid configuration, as both addresses are on the same subnet.

   • A JACE does not provide IP routing or bridging operation between different Interfaces (LAN ports, GPRS, dialup).

   • All of this also applies to the “third interface” provided by the “WiFi option” if installed in a JACE (at the time of this document, available for a JACE-700 only). However, it is likely the WiFi interface will be used as the primary interface in most cases (no LAN cabling available to the JACE).

   The Undo Changes button resets all settings (all Interfaces) back to the original pre-step values.