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diff --git a/results/scraper/launchpad-without-comments/1628971 b/results/scraper/launchpad-without-comments/1628971
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+-netdev user: guestfwd doesn't work
+
+Hello!
+
+QEMU emulator version 2.6.1 (Debian 1:2.6.1+dfsg-0ubuntu4), Copyright (c) 2003-2008 Fabrice Bellard
+
+The IP address 192.168.1.46 is assigned to eth0.
+
+qemu-system-x86_64 \
+    -no-hpet \
+    -nodefconfig \
+    -machine accel=kvm \
+    -cpu host \
+    -smp 2 \
+    -drive if=virtio,file=yakkety-server-cloudimg-amd64.img \
+    -device virtio-net-pci,netdev=net0 \
+    -netdev 'user,id=net0,hostfwd=tcp::2222-:22,guestfwd=tcp:1.2.3.4:1234-cmd:nc 192.168.1.46 8842' \
+    -m 1024 \
+    -initrd yakkety-server-cloudimg-amd64-initrd-generic \
+    -kernel yakkety-server-cloudimg-amd64-vmlinuz-generic \
+    -append 'root=/dev/vda1 modprobe.blacklist=floppy systemd.log_level=debug systemd.journald.forward_to_console=1'
+
+Without the guestfwd=... part everything works nicely. With it I get the following message.
+
+
+qemu-system-x86_64: -netdev user,id=net0,hostfwd=tcp::2222-:22,guestfwd=tcp:1.2.3.4:1234-cmd:nc 192.168.1.46 8842: conflicting/invalid host:port in guest forwarding rule 'tcp:1.2.3.4:1234-cmd:nc 192.168.1.46 8842'
+qemu-system-x86_64: -netdev user,id=net0,hostfwd=tcp::2222-:22,guestfwd=tcp:1.2.3.4:1234-cmd:nc 192.168.1.46 8842: Device 'user' could not be initialized
+
+
+But I just compiled c640f2849ee8775fe1bbd7a2772610aa77816f9f, and I get the same behavior.
+
+pas@strange:~/qemu/x86_64-softmmu$ ./qemu-system-x86_64 -net 'user,guestfwd=tcp:1.2.3.4:1234-cmd:nc 192.168.1.48 80'
+qemu-system-x86_64: -net user,guestfwd=tcp:1.2.3.4:1234-cmd:nc 192.168.1.48 80: conflicting/invalid host:port in guest forwarding rule 'tcp:1.2.3.4:1234-cmd:nc 192.168.1.48 80'
+qemu-system-x86_64: -net user,guestfwd=tcp:1.2.3.4:1234-cmd:nc 192.168.1.48 80: Device 'user' could not be initialized
+
+
+After poking a bit around it seems that this check fails in slirp/slirp.c: (around line 1074)
+
+    if ((guest_addr->s_addr & slirp->vnetwork_mask.s_addr) !=
+        slirp->vnetwork_addr.s_addr ||
+        guest_addr->s_addr == slirp->vhost_addr.s_addr ||
+        guest_addr->s_addr == slirp->vnameserver_addr.s_addr) {
+        return -1;
+    }
+
+Because guest_addr, and slirp has equivalent s_addr values.
+
+x86_64-softmmu/qemu-system-x86_64 -net 'user,net=10.0.2.0/24,host=10.0.2.2,guestfwd=tcp:12.0.0.2:80-cmd:echo ok'
+
+guest_addr: 12.0.0.2
+vnetwork_mask: 12.0.0.2
+vhost_addr: 12.0.0.2
+vnameserver_addr: 12.0.0.2
+guest_addr & mask: 12.0.0.2
+
+
+Thanks in advance for looking into this!
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