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[Qemu-discuss] tap network not working properly on kernel 4.14

From: Max Blau
Subject: [Qemu-discuss] tap network not working properly on kernel 4.14
Date: Tue, 21 May 2019 02:00:01 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

I've placed a tap0 adapter into an OpenWrt system (kernel 4.14). The
tap0 device cannot access any other subnets, packets don't get
forwarded. That's unexpected behavior. Deploying the image 1:1 to real
hardware substituting the tap0 interface with a real NIC magically works
properly. Also, using QEMU with an Arch Linux guest (kernel 5.1.3) works
as expected as well. So, my guess is there's something picky about the
4.14 kernel (or OpenWrt in particular). Full details here:

Is there anything known about this issue?

Linux 5.1.3-arch1-1-ARCH #1 SMP PREEMPT Thu May 16 20:59:36 UTC 2019
x86_64 GNU/Linux
qemu-x86_64 version 4.0.0

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