Static IP addresses on private networks ensure that things will work and stay working. I tried using DHCP assigned IP addresses for my printers with built in network interfaces, and before those the external HP JetDirect network printer interfaces. The problem was whenever there was a power outage or someone turned a printer off, Windows would 'lose' the printers or JetDirect units until I removed and reinstalled them in the computers. Some of the time just rebooting my PC would magically lose one or more network printers.
With static IP addreses the printers get installed ONCE and they always work. So if you're having issues connecting to CNC machines and are using DHCP, just stop trying that and assign static IP's then print out the IP address labels for each machine. If the machines are *way over there*, print a list of machines and their addresses to keep by the control computer. The only other method as simple is BOOTP where a single computer running a BOOTP service remotely assigns fixed IP addresses to the MAC addresses of the printers, machine tools, other computers etc. That way the admin doesn't have to login by telnet or use on-device configuration to manually set the device's IP address so it'll Just Work when the cable's connected. With BOOTP the IT guys just plug it in and the Admin logs into the server, opens BOOTP setup, types in the MAC address and desired IP address for it. As long as the BOOTP server process is running and accessible all across the LAN, it'll work. Another benefit of BOOTP is if a computer goes down, IT can have an identically configured one ready in advance. Just swap the problem PCs network card to the replacement and it's ready to go without needing to go into its operating system network setup to change the address. On Monday, July 22, 2019, 11:59:43 AM MDT, Mark Wendt <wendt.m...@gmail.com> wrote: Why bother when a static IP address works and has a lot less system overhead, along with the latency of the packet filtering? I'd stay away from iptables unless you really need to use it. Mark _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
