virtualbox.org

Host: Windows 7 Enterprise 64-bit
VirtualBox: 3.2.12
Guest: Oracle Enterprise Linux (essentially Red Hat)

Networking is configured in host-only mode.

I have a number of applications running in the guest OS that require TCP/IP communication between guest and host. This works perfectly.

However, I have another application running in the guest that requires UDP. It seems that UDP traffic does not flow between the guest and the host.

Is this a bug or a known limitation?

The communication between Host and Guest with Host-Only is unlimited, so UDP should work just as well. It's even part of the TCP/IP stack. What do you see when you use a network analyser like Wireshark on the connection?