One day working, next day will not connect to Laser

LightBurn Software Questions
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So I have two Omtech Laser cutters. Initially I set them up to run via USB and had no problems. Two people need to use lasers so I then put the machine in another room so switched to Wifi. Also added a second machine so both of us can send files to either laser via either machine.

For about 6 months no problem, everything worked. Then our eero router died. Internet provider replaced it. Luckily as eero uses an account, all settings restored on new eero by engineer including reserved IP addresses for lasers.

Went to use the laser. One PC no problems, can send files to either laser via Wifi.

The second PC will not connect despite no changes.

I have come back to the issue a few times over the last couple of months and just tried this morning and did the following:

  • Checked IP addresses in Lightburn - both identical to PC that works.
  • Updated Lightburn - both versions are the same on both PC’s.
  • Deleted one of the lasers, even exported settings from one that works and imported laser on PC that doesn’t.
  • Removed McAfee - perhaps that was hindering it.

Luckily I have one PC that works. But 2 months later this is driving me mad as I have to ask the other person to use their machine.

Anyone have any other ideas to try, excluding reformatting PC and starting again?

I am fairly technically minded but I have hit the wall with what to do.

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Fixed it, but now my understanding of issuing local IP addresses is in question.

Ok, tried running dos prompt.

My eero router has an address of 192.168.4.1 and all devices have IP addresses fit 192.168.4.x as expected except the PC that doesnt connect to laser.

My PC is being issued IP address of 192.168.5.x but somehow I am getting internet access. How?

So I manually set my ip address to 192.168.4.204 (will reserve it in the router) and the laser works again.

I cant let my router issue my PC an address as it keeps going to 192.168.5.x range.

Sometimes I hate technology!

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This suggests the new router differs from the old router:

  • Old router subnetwork: 192.168.4.x
  • New router subnetwork: 192.168.5.x

The laser controller’s static IP address is in the old subnetwork, so it’s not reachable from the new subnetwork. When you force the PC’s IP address to the old subnetwork, it can connect to the laser, but the PC will not connect to the router (and, through it, the InterTubes).

Do this:

  • Revert the PC to automatic / DHCP address assignment, so the router can put it in the new subnetwork again
  • Change both laser controller IP addresses to the new subnetwork.

The lasers must have different IP addresses: the last number in their IP addresses must be different. You must also create a separate LightBurn Device for each laser, because a Device can have only a single IP address.

A previous discussion has more details:

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