realtek: Traffic directly on lanX not working

Birger Koblitz mail at
Sun Jun 20 02:01:03 PDT 2021


On 19.06.21 14:25, Hauke Mehrtens wrote:
> Hi,
> I am unable to send and receive packets directly on the lan1 interface when it is not part of a bridge.

> In wireshark on a connected host I do not see any packets from this device, but the link is up.
> When I use OpenWrt's default network configuration using a bridge, network works like expected.
> I took care of the VLAN 100 which is used by default, but this setup does not use any VLAN.
> I would like to use a very similar configuration for the failsafe mode which is also not working correctly.

This is the same finding tmon had:

The reason is a hardware limitation on RTL chip families 8380-9300, they require a port to be a member of VLAN 1
in order to send/receive traffic:

I am not sure how to proceed. One solution is to set this up silently in the driver, but then the existence of
vlan 1 would be intransparent to the user, a possible security risk.


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