Netbios Problem


I am running windows 7 on my host machine, and also running virtualbox with windows xp.
I have internet running on the host and the VM using the same LAN network (home network).
But I have a netbios problem on XP even though I have netbios enabled in network connection properties. Even worse I cannot ping the VM XP with my host windows 7, but I can ping windows 7 with the VM XP ?
I can also ping VM XP with its loopback address and its own IP address?

Any suggestions?

Thanks for future help

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