What is the simplest way to confirm or to disprove that Virtual Box virtual machines support GRE protocol

Posted by mbaitoff on Super User See other posts from Super User or by mbaitoff
Published on 2011-03-04T15:11:49Z Indexed on 2011/03/04 15:27 UTC
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networking

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virtualbox

It is stated in VirtualBox manual (chapter 6) that VM network interfaces in "NAT" mode do not support GRE protocol. I'm currently trying to setup a pair of VMs as pptp server and client which would communicate via VM's network interfaces in "INTERNAL NETWORK" mode. I set up modern Linux OSes with pptp software on both machines and made some basic pptp configuration. However, I fail to connect the client to the server - server reports a failure when writing to GRE socket.

I now need a quick proof of principal ability to use the GRE protocol between VirtualBox VMs over a network in "INTERNAL" mode, such as a several-line .c program that would try to open/send/receive/close a GRE protocol connection, or like a specific lightweight tool to diagnose the GRE availability.

Any suggestions?

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