Thanks very much. So you mean, we can not setup the tunnel between two host residing in two private network behind the gateway (gw has public ip not the xenserver itself.)
Since right now, our xenserver hosts are all within the private network behind the GW, every traffic must go through the gateway which does the NAT port forward to all traffic coming in and out. As you just said, the xenserver host must have no choice but to have public ip and connect to the internet not behind the gateway to establish the tunnel ? On Sun, Oct 2, 2011 at 1:19 PM, Jesse Gross <[email protected]> wrote: > On Oct 2, 2011 1:07 PM, "terryxing" <[email protected]> wrote: > > > > Thanks for your timely reply. > > > > Right, we are using two public ip for two remote hosts talking to each > other. I am wondering if it is possible to let two host in private network > talk to each other through their corresponding gateway having public ip ? > > If there is IP connectivity then you should be able to establish a tunnel. > > > In that way, we need to configure the potables on the GW and do NAT. Do > you know what port the gre tunnel is using to talking to remote hosts ? And > it is using UDP right ? > > GRE is not a UDP based protocol. It runs directly over IP. > -- Best regards, Tianyi Xing (邢天翼) PhD Student, Research & Teaching Associate SNAC:Secure Networking and Computing group School of Computing, Informatics, and Decision Systems Engineering Ira A. Fulton School of Engineering, Arizona State University Tempe, AZ 85281, USA Cell: (+1) 480-678-3090
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