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+qemu-system-x86_64: ipv6 and dns is broken with netdev user
+
+Hi,
+
+dhcp inside qemu returns an ipv6 address as dns-server. However this is not
+working. If i replace it with the ipv4 address '10.0.0.2' dns is working
+again. I would expect that the qemu emulated dhcp server responds either an
+ipv4 configuration that is working or its dns server/forwarder listens on the
+ipv6 address returned by the emulated dhcp server.
+
+I used latest qemu from git ( b0bcc86d2a87456f5a276f941dc775b265b309cf) and used the following commands:
+
+$ ./qemu-system-x86_64 -enable-kvm -M pc -device virtio-rng-pci -device
+virtio-net-pci,netdev=user.0 -drive file=buildenv.img,if=virtio,bus=1,unit=0
+-no-reboot -netdev user,id=user.0,hostfwd=tcp::5022-:22,hostfwd=tcp::7587-:7588
+-m 1024 -usb -nographic -smp 4
+
+buildenv.img is a debian jessie amd64 installation.
+
+Inside qemu the network is configured to use dhcp:
+
+$ cat /etc/network/interfaces
+allow-hotplug eth0
+iface eth0 inet dhcp
+
+$ ifconfig eth0
+eth0      Link encap:Ethernet  HWaddr 52:54:00:12:34:56
+          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
+          inet6 addr: fe80::5054:ff:fe12:3456/64 Scope:Link
+          inet6 addr: fec0::5054:ff:fe12:3456/64 Scope:Site
+          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
+          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
+          TX packets:28 errors:0 dropped:0 overruns:0 carrier:0
+          collisions:0 txqueuelen:1000
+          RX bytes:3215 (3.1 KiB)  TX bytes:3638 (3.5 KiB)
+
+$ cat /etc/resolv.conf
+nameserver fec0::3
+
+$ arp google.de
+google.de: Host name lookup failure
+
+$ strace -f arp google.de
+...
+socket(PF_INET6, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 4
+connect(4, {sa_family=AF_INET6, sin6_port=htons(53), inet_pton(AF_INET6, "fec0::3", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0
+poll([{fd=4, events=POLLOUT}], 1, 0)    = 1 ([{fd=4, revents=POLLOUT}])
+sendto(4, "\17\320\1\0\0\1\0\0\0\0\0\0\6google\2de\0\0\1\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
+poll([{fd=4, events=POLLIN}], 1, 5000)  = 0 (Timeout)
+poll([{fd=4, events=POLLOUT}], 1, 0)    = 1 ([{fd=4, revents=POLLOUT}])
+sendto(4, "\17\320\1\0\0\1\0\0\0\0\0\0\6google\2de\0\0\1\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
+poll([{fd=4, events=POLLIN}], 1, 5000)  = 0 (Timeout)
+close(4)                                = 0
+...
+
+$ echo nameserver 10.0.0.2 > /etc/resolv.conf
+
+$ arp google.de
+google.de (216.58.208.35) -- no entry
+
+Note: I reported this bug also to debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=844566
+
+Regards,
+
+  Manuel
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