[Qemu-devel] [Bug 590552] Re: New default network card doesn't work with tap networking

[Gabriele Tozzi <590552@bugs.launchpad.net>]

Thank you for your interest but after more than 6 years I can't even
remember what this bug was about.

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https://bugs.launchpad.net/bugs/590552

Title:
  New default network card doesn't work with tap networking

Status in QEMU:
  Incomplete

Bug description:
  Unfortunately, I can provide very little information.

  Hope this will be useful anyway.

  I've upgraded qemu using debian apt to lastest unstable (QEMU PC
  emulator version 0.12.4 (Debian 0.12.4+dfsg-2), Copyright (c)
  2003-2008 Fabrice Bellard): looks like at some point the default
  network card for -net nic option was switched to intel gigabit instead
  of the good old ne2k_pci.

  I was using -net tap -net nic options and my network stopped working.
  When not working,
  - tcpdump on the host shows me taht all packets are sent and received fine from guest
  - tcpdump on guest shows that packets from host are NOT received

  obviously, both host tap interface and guest eth0 interfaces, routing
  tables, dns, firewall, etc... are well configured.

  Having banged my head for a while, I finally stopped the host and
  started it again using -net nic,model=ne2k_pci option, then my network
  magically started working again.

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