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The Network subnet check told the reporter that 192.168.98.170 and 192.168.96.9 were on different networks and to go configure routing between them. They are four hundred addresses apart inside one 192.168.96.0/22 LAN. An IPv4 address does not carry its prefix, and the check supplied /24 for both sides. That is the most common LAN and not the only one, and the guess is wrong in both directions: it splits a /22 and it merges a /25. Read the prefix off the interface that owns the address instead. find_local_ipv4_network() enumerates every interface, including the ones EXCLUDED_INTERFACE_PREFIXES hides. That list keeps docker0 and friends out of the Virtual Printer's bind dropdown; here the caller is asking about an address the kernel has already picked as a route source, and answering "unknown" because it sits on a bridge would be a worse answer than the truth. When nothing claims the address the check skips, which is what it always did with no host IP at all -- it must not assert a split it cannot see. The same check chose which of Bambuddy's own addresses to compare by probing a route toward 10.255.255.255, which on a multi-homed host is not the interface the printer is on. It asks for the route toward the printer now. On a two-NIC dev box that alone was warning about a printer sitting on the second card's own subnet. The probe takes IPv4 literals only. connect() on a name would resolve it on the event loop, and _same_subnet rejects names anyway, so nothing is lost. Resolving the prefix shells out to `ip -j addr show`, so it moves off the loop too. ----- fix(diagnostics): name the container engine instead of asking about Docker (issue #3092) "Not running in Docker - not applicable", said to a Bambuddy inside a Podman container. It reads as "you are on bare metal", and it sent the reporter looking for his problem somewhere else. Podman runs Bambuddy in exactly the two shapes Docker does, and the shape is the thing that breaks printer discovery and the Virtual Printer. detect_container_runtime() names the engine -- Docker, Podman, Kubernetes, containerd, LXC, or a container it cannot place -- and the check became Container network mode. is_running_in_docker() is deliberately left alone rather than rewritten on top of it. Three callers key real behaviour off that flag, and one of them switches the Add Printer flow from SSDP to subnet scanning. SSDP works for a host-networked Podman container, so answering True there would take a working feature away to fix a sentence. Widening it is a separate decision from naming the engine, so it is made separately. Mode detection keeps the original signal first, which also makes the Docker path incapable of regressing: a Docker host always has a docker0, so a container that sees one shares its namespace, and the new rules can only turn a warning into a pass. That signal says nothing about Podman, which creates no such interface on a host running no bridge containers -- which is how host networking came to be reported as bridge. The general form of the same idea answers for Podman: an interface whose iflink equals its ifindex was created in this namespace, and a NAT-networked container only ever receives one end of a veth pair. tun/tap is skipped, because a container may run its own WireGuard and that tun is native to a namespace it is not evidence of. The interface also has to be the one the kernel just named -- sysfs is namespace-tagged but a bind-mounted host /sys is not, and reading a colliding name's numbers would be reading another namespace's answer. What is still unreadable now says so and suggests host networking if discovery is failing, rather than guessing bridge and telling a healthy install to recreate itself. An LXC or LXD system container is named and told the question does not apply: it is on the LAN like a small virtual machine, so there is no network mode to recommend -- and its subnet check still runs. An engine we cannot name is a sentinel the frontend localizes, not a word interpolated into thirteen other languages. The support bundle carries the engine name beside the Docker flag, so the next report of this shape is answerable from the bundle.