OpenWRT dumb AP: devices on the same subnet cannot ping

Hi everyone!

I experience weird issue I’ve never had before (with OpenWRT on Linksys WRT1200AC and WRT1900AC ). I recently moved to a new place and recreated the setup with my GL-AXT1800, but facing the networking issue this time. Posted the question on OpenWRT forum, but was suggested top ask GL-inte community. I have done all the configuration via LUCI - so no stock firmware changes were made.

My setup is the following: Pfsense router (VLANS enabled) + OpenWRT Dummy Access Point (VLANS enabled). The devices are connected LAN-to-LAN and the DHCP provides the correct addresses from the defined scope. Internet Access is working.

VLANS: IOT, LAN, GUEST, DMZ. Wifi for each vlan. The issue is that the clients on LAN ( have Internet access, but cannot discover each other, so my MacBookPro ( cannot ping neither my MacPro ( nor my Android phone (… And vice versa…

They seem to be isolated, but the “Isolate Clients” checkbox is not ticked.

The Firewall is disabled on the OpenWRT.

The Pfsense firewall at this point should not even matter as the traffic on the same subnet should not even touch the router, but in case you ask - it has “Allow all traffic” rule on LAN vlan.

The firewall on MacOS clients is Disabled too.

❯ sudo pfctl -d
No ALTQ support in kernel
ALTQ related functions disabled
pfctl: pf not enabled

Routing table on my laptop:

❯ ip r
default via dev en0 via dev lo0 via dev lo0 dev en0  scope link dev en0  scope link dev en0  scope link dev en0  scope link dev en0  scope link dev en0  scope link

So I guess dev en0 scope link - is the route that must work in case of current inter-subnet communication.

Again, ICMP is not blocked, as client firewalls are disabled. I’m not a networking guy, so I thought, maybe it’s some weird ICMP issue, so tried to check the TCP… I’ve enabled VNC and SSH on my Desktop( and scanned ports from this same machine on its LAN interface and all seems good:

❯ nmap -Pn -p5900,22
Starting Nmap 7.92 ( ) at 2022-12-25 17:22 PST
Nmap scan report for desktop.home.lan (
Host is up (0.00040s latency).

22/tcp   open ssh
5900/tcp open vnc

Nmap done: 1 IP address (1 host up) scanned in 0.14 seconds

But when scanning same Desktop’s ports from my Laptop (

❯ nmap -Pn -p5900,22
Starting Nmap 7.93 ( ) at 2022-12-25 17:53 PST
Nmap scan report for desktop.home.lan (
Host is up.

22/tcp   filtered ssh
5900/tcp filtered vnc

Nmap done: 1 IP address (1 host up) scanned in 3.04 seconds

And my Android device ( cannot ping both and…

ubus call system board output:

root@OpenWrt:~# ubus call system board
        "kernel": "4.4.60",
        "hostname": "OpenWrt",
        "system": "ARMv7 Processor rev 4 (v7l)",
        "model": "GL Technologies, Inc. AXT1800",
        "board_name": "glinet,axt1800",
        "rootfs_type": "squashfs",
        "release": {
                "distribution": "OpenWrt",
                "version": "21.02-SNAPSHOT",
                "revision": "r16273+114-378769b555",
                "target": "ipq807x/ipq60xx",
                "description": "OpenWrt 21.02-SNAPSHOT r16273+114-378769b555",
                "tip-revision": "OpenWrt 21.02-SNAPSHOT r16273+114-378769b555 / TIP-devel-349ddbc4",
                "tip-version": "devel"

At this point I am out of ideas, but I am almost sure there is something to do with the wireless connection on my OpenWRT AP… Just have not clue how to troubleshoot this… Please help. Thank you.