Installed a new POS system for a client. 100% Meraki MX, switches, and wireless. All POS devices are hard plugged directly into the Meraki switch (home runs) on the POS VLAN.
Customer called that POS terminals are having an issue. I login to Meraki and can ping all POS units with 0% packet loss, however when I check the event log I am seeing an IP Conflict. We reboot the POS units and the issue stops and the client IP conflict goes away. Randomly it starts again and the client IP conflict comes back, so I know for certain when client IP conflict happens the POS have issues.
Things we have tried:
- Removed dumb switch between Meraki & POS and ran dedicated home runs back to Meraki switch
- Used DHCP reservations, then removed them
- Turned off Meraki firewall IP Spoofing
- Upgraded firmware of switch and MX
- Ran cable tests on switch, confirmed no issues with drops
I called the POS vendor who said they want us to install the Zyxel router that came with the system. Frustrated they are making us do that because system requires no porting forwarding and only needs a specific VLAN with DHCP that is all. We are doing that now but want to see if anyone has seen this before and if they were able to fix it.
We are using Cake POS. They are saying it could be a "phantom" network, which sounds like something they have experienced and that is what they call it internally. All other devices on the POS network is printers. None of them are having these issues.
00:00:00:00:00:00 is an invalid MAC address. If any device is using this then it has a fault. Most likely a hardware fault. The manufacturer of the NIC has failed to burn in a MAC address to the device.