Re: [Xen-users] Guest domain cannot connect to outside network

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-01-27 at 22:40 -0500, Meng Xu wrote:
> Hi Ian,
> 
> 
> Thank you so much for your reply!
> 
>         
>         
>         > Inside dom0, its Gateway is 158.130.50.1, Its DHCP is
>         158.130.21.22;
>         > dom0 can NOT pinig 10.0.50.253.
>         >
>         >
>         > Right now, I'm thinking if the Gateway 10.0.50.1 really
>         exist? It
>         > seems that the ip address automatically assigned to the domU
>         is
>         > incorrect.
>         
>         
>         Perhaps 10.0.50.1 is simply configured to not respond to
>         pings?
>         
>         If the gateway came from your IT departments infrastructure
>         and you
>         believe it to be wrong then I think you need to speak to them
>         about it.
>         
>         
> 
> 
> In my understanding, 10.0.50.1 should be a inner-network which are
> unseen from outside network.

What inner network? There is nothing to suggest the creation of such a
thing in any of your configuration details which you have posted.

Neither Xen nor the Xen tools will create networks or subnets by
themselves (unless perhaps you were using the vif-nat configuration, but
your config files say you are not).

Something in your environment is creating this network -- the most
likely candidate is a DHCP server somewhere.

>  In addition, the 10.0.50.1 only appears in DomU after the DomU is
> created. 

That seems tautological to me.

> Is it possible that when Xen create a DomU, it uses a gateway which
> does NOT exist in dom0 and thus cause an invalid gateway?

The gateway is provided either by a DHCP server or by the static
networking configuration *within* the guest. Neither Xen nor the Xen
tools will create or configure a gateway for the guest on their own.

AFAICT none of the issues that you are experiencing are Xen issues, they
appear to relate to the way your network infrastructure is configured,
or perhaps to misunderstanding that configuration. I would recommend
that you find someone locally who is familiar with troubleshooting
network configuration issues and ask them to help you.

Ian.


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