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[Bug 1404278] Re: tap connections not working on windows host

From: Varun Chitre
Subject: [Bug 1404278] Re: tap connections not working on windows host
Date: Fri, 12 Feb 2021 10:51:38 -0000

What was the fix that took place in the mainstream qemu? I'm facing the
same issue on the latest Android Emulator (emulator: Android qemu
version (build_id 7033400) (CL:N/A)) on Windows 10.

TAP network gets attached just fine and shows us as eth1 on guest in
ifconfig. But cannot ping the host. Tried removing the bridge i.e with
just the standalone TAP adapter by assigning to the host-
side adapter and to the guest-side - the guest cannot ping

What was the actual fix? Maybe I can check if the fix got picked up or
not on Google's emulator repo.

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  tap connections not working on windows host

Status in QEMU:
  Fix Released

Bug description:
  using latest qemu 2.2.0 64bit for windows host (installed from
  qemu-w64-setup-20141210.exe obtained from http://qemu.weilnetz.de/w64/
  ),OpenVPN 2.6.3-I601 64bit tap adapter named tap01 and calling qemu
  using the following.

  qemu-system-x86_64.exe -m 512 -net nic -net tap,ifname=tap01 -hda

  where the image contains a slackware 14.0 64bit install.
  The tap is bridged with the real network adapter and the bridge is given an 
ip of (which works as the ip for the windows host). The tap adapter 
(in network connections) shows connected when the qemu vm is running. inside 
the vm, the network is given an ip of (the netmask and default 
gateway are the same for the virtual and real pc).
  The vm cannot see the rest of the local network or visa-versa. This used to 
work in early (0.9 32bit) versions of qemu.

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