No Packets Received - Hyper-V Guest (Server 2008R2)

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http://serverfault.com – I have just installed a new Hyper-V host machine running Server 2008 R2. Created the first VM (also Server 2008 R2 SP1) and all is working apart from a bizare problem with network packets. Host machine has two Intel Nic's one is dedicated to Hyper-V and is setup as an "External" network in Virtual Network Manager. It's also removed from the management OS, so dedicated just to Hyper-V. (We have two other Hyper-V hosts with the exact config). The guest machine was installed and connected to this virtual network, but the guest OS can not receive network packets, it only sends. I configured a ma (HowTos)