@RMerlin
I just wanted to report an issue I discovered while testing things on the latest firmware.
The issue is L2/ARP failure to wired clients between LAN Port 4 and LAN Port 2 of my GT-BE98 Pro. If I move Hue Bridge I am trying to ping to LAN port 5 (1Gb) things instantly work again.
I realize this is likely out of your scope; but maybe you could escalate the message up the chain when you have a free cycle?
I know this also impacted
@Viktor Jaep as he mentioned similar behavior in DMs to me previously, and I do see similar threads on the issue here:
https://www.snbforums.com/threads/be-98-pro-3006-102-5-upgrade-lan-port-issue.95528/
This seems to indicate the issue has existed since firmware 102.5...
Here are some detailed screenshots and the behavior I've noticed.
When the Hue Bridge is connected to
LAN port 4, my desktop cannot reach it even though both devices are on the same subnet.
The failure is clearly
Layer-2 / ARP: Windows cannot resolve a MAC for 192.168.50.189 and returns
“Destination host unreachable” immediately.
If I add a
host route (/32) to force traffic via the router, it works (suggesting the router is effectively relaying it at L3 / proxying).
However, the real “smoking gun” is that
moving the Hue Bridge from LAN4 to LAN5 (the 1Gb port) instantly resolves the issue with no workaround needed. That points to a LAN4 bridging/switching issue...
The expected behavior would be on a flat /24, the Desktop PC should ARP for 192.168.50.189 and then ping it directly (on-link).
No static routes should be required. But the actual behavior can be seen below (only when Hue Bridge is on LAN Port 4)
From my desktop on LAN port 2:
Ping fails immediately:
Code:
ping 192.168.50.189
Reply from 192.168.50.163: Destination host unreachable.
Traceroute fails immediately at hop 1 (local host unreachable):
Code:
tracert 192.168.50.189
1 192.168.50.163 reports: Destination host unreachable.
No ARP entry for the Hue Bridge:
Code:
arp -a | findstr 192.168.50.189
<no output>
Windows neighbor table explicitly shows it as unreachable:
Code:
netsh interface ipv4 show neighbors | findstr 192.168.50.189
192.168.50.189 Unreachable Unreachable
Routing table is correct (on-link /24 route exists):
Code:
route print -4 | findstr 192.168.50.
192.168.50.0 255.255.255.0 On-link 192.168.50.163
So the PC is doing the right thing (treating it as on-link), but ARP resolution is failing.
Things I’ve already verified (to rule out config / isolation)
- The Hue Bridge is NOT on a Guest/IoT SSID with LAN blocked.
- There is no AP/client isolation enabled on the primary network/VLAN
- I’ve ensured everything is on the same bridge/VLAN
- The router correctly sees the Hue Bridge online at 192.168.50.189.
The 2 current workarounds I've found (while keeping isolation enabled on the Guest VLANs) are:
1. Moving my Hue Bridge from LAN Port 4 to LAN port 5 (1Gb Port) things will instantly work again, even without the below route.
2. Or add a /32 host route so Windows sends it to the gateway instead of ARPing for the Hue Bridge directly, the desktop can ping it:
Code:
route add 192.168.50.189 mask 255.255.255.255 192.168.50.1 metric 1
This allows things to continue to work on LAN Port 4 and LAN Port 2.
After that, ping works.
This is not a “real fix” for a same-subnet host. it’s just a workaround that avoids direct ARP to 192.168.50.189.