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

From: Max Blau
Subject: Re: [Qemu-discuss] tap network not working properly on kernel 4.14
Date: Tue, 21 May 2019 21:15:26 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 21.05.19 at 02:00 wrote Max Blau:
> 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:
> https://superuser.com/questions/1438816/openwrt-in-qemu-no-response-from-other-subnets-with-tap-network
> 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
Never mind. The error was a bad ip route.

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