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I have an Ubuntu machine and I have installed 64-bit RHEL on VirtualBox.

I changed the adapter settings of the guest to connected to bridged network, and I am able to ping my host from the guest, but the opposite is not possible. Any clues?

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+1 for asking on SU. Could you give the output of ifconfig -a on both the host and guest? This will help us diagnose the networking situation. – Nicole Izumi May 24 '12 at 13:22

Add a bridge group with brctl, add a tap interface to the bridge group with uml tools, and you should be good to go assuming the RHEL firewall isn't blocking ICMP.

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