1) DHCP can in fact be "static". What you do is configure your DHCP server to always assign the same IP to each physical device and/or make the lease time really, really long. DHCP adds zero overhead once the IP address and other info is set.
2) Ipfilters should not be used on a real-time machine. It you want a firewall because your local network is routed to the Internet you should place the firewall in the router, not on each computer. On Mon, Jul 22, 2019 at 5:57 PM Gregg Eshelman via Emc-users < [email protected]> wrote: > 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 < > [email protected]> 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
