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Instance Internet connection problems


I have a 3 node setup with vagrant + VirtualBox which is similar to the official OpenStack Manuals. To give my instances access to the internet I added another bridged interface to my Network Node and an SANT rule. My network node is at and my instances receive floating IPs from to 20. I set the gateway of the external subnet to So the traffic from the instances is received at the network node and from there to my labs LAN. The above mentioned SNAT rule is

iptables -t nat -A POSTROUTING -s -j SNAT --to-source <IP from bridge to lab LAN>

Now my problems start. From the instances I ruled out the usual GRE issues and set the MTU down. I can now ping hostnames successfully. But if I try to wget a file it takes ~30 secs to start the download and then is extremely slow. I can't figure out why it takes so long for the transfer to start. I would love some suggestions or maybe other ways to give my instances a proper internet connection. How did you make it in your testlab?