Stephen, LOL. That’s not a real problem with today’s microprocessors. The TM1000A, for example:
“...is capable of serving 135+ synchronizations per second. That provides support for over 120,000+ devices updating every 15 minutes on the network.” As for ARP traffic deluges, if that’s happening on your LAN, you have bigger problems :) -mel > On May 1, 2019, at 6:21 PM, Stephen Satchell <l...@satchell.net> wrote: > > One word of caution when using a low-priced NTP appliance: your network > activity could overwhelm the TCP/IP stack of the poor thing, especially > if you want to sync your entire shop to it. In the case of the networks > I set up, I set up a VLAN specific to the NTP appliance and to the two > servers that sync up with it. Everything else in the network is > configured to talk to the two servers, but NOT on the three-device "NTP > Appliance VLAN". > > NOTE: Don't depend on the appliance to provide VLAN capability; use a > configuration in a connected switch. How you wire from the appliance to > a port on your network leaves you with a lot of options to reach a > window with good satellite visibility, as CAT 5 at 10 megabits/s can > extend a long way successfully. Watch your cable dress, particularly > splices and runs against metal. (Or through rooms with MRI machines -- > I'm not joking.) > > The two servers in question also sync up with NTP servers in the cloud > using whatever baseband or VLANs (other than the "NTP VLAN") you > configure. Ditto clients using the two servers as time sources. > > The goal here is to minimize the amount of traffic in the "NTP Appliance > VLAN". What killed one installation I did was the huge amount of ARP > traffic that the appliance had to discard; it wasn't up to the deluge. > > Learn from my mistakes. >