I'm developing software for a proprietary hardware system that has traditionally run on Windows without any issues, but now I'm transitioning to Linux (specifically Kubuntu 25.10), and I'm facing some challenges. This hardware setup involves an internal switch and DHCP server, which assigns unique VLAN IDs to all connected devices for its internal management. The problem is that even though all devices, including my controlling PC, are on the same subnet (10.0.0.x), these VLAN IDs disrupt communication, leading to issues like malfunctioning ARP. Since Windows seemed to handle this automatically without me being aware of it, I'm at a loss on how to configure things in Linux. I can communicate by defining VLANs, but it's inconsistent and might introduce routing issues. I'm looking for ways to ignore these VLAN tags entirely so that the packets are treated as untagged, allowing all devices to communicate seamlessly. Any advice or tips on how to get around this would be greatly appreciated!
4 Answers
If you want to ignore VLAN tagging completely, one route could be to not configure any VLANs on your interfaces in the first place. That said, be wary—some lower-end switches might have a default tagging scheme that could give you headaches. You might find it useful to switch to a more stable distro like Debian if stability is key for your setup. Just my two cents!
Honestly, I've seen similar issues. Windows drivers at times don’t deal with 802.1Q tags properly, which might explain your previous smooth sailing. On Linux, ensuring that VLAN handling is explicitly defined is essential. If you absolutely want to strip tags, look into configuring your devices accordingly or using an upstream device that can manage that for you, stripping those tags before they reach your Linux setup. Good luck!
It sounds like you're in a tricky situation with those VLAN IDs causing issues. Typically, if all your devices are on the same IP subnet, having separate VLANs doesn't bode well for communication since VLANs are a Layer 2 concept. I would suggest looking into what’s actually tagging those frames in the first place. It's usually something like a switch or router, so if you can disable that, it might resolve your problem. If not, consider adding a bridge on your Linux box that can handle those tagged VLANs for you instead of letting them create confusion on your network.
Honestly, your setup sounds a bit messy. If you’re on Linux, you might want to try creating a bridge interface to merge those VLANs together. I know that sounds like a lot of work, but it could help you streamline communication across all devices without having to define each VLAN manually. Just make sure you're not sending out VLAN IDs that don't actually match where those packets need to go!
Right, bridging them might work better. Just ensure your network architecture can handle it!
Totally agree with you! It’s crucial to identify what's tagging those packets. Fixing that at the source could simplify everything.