Re: [Xen-devel] Multiple IP addresses?

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>]

> On Thursday 19 February 2004 13:23, Ian Pratt wrote:
> > > Is it possible or the guest domain is limited to one IP address per
> > > physical interface?
> >
> > Certainly. By default guests get *no* IP addresses -- you have to
> > assign them. This is done by "vfr_ipaddr" during domain creation,
> > or you can add/delete addresses latter using the xc_dom_control.
> 
> How is this related to network configuration inside guest domain (ifconfig)?
> Guest can only setup an interface with address that is 'granted' to it?

Guests can configure whatever they like using ifconfig, it just
won't do them any good : They won't be able to receive or even
send any packets on an address unless Xen has been told to
associate the address with the domain's VIF (virtual interface).

To paraphrase a common saying uttered by nightclub doormen: 
"if your name's not on the list, you don't go on the wire." ;-)

Hence, Xen provides secure isolation of domain's IP addresses.
The next version of Xen will also provide L4 port-space
isolation, enabling two or more domain to share a single IP via
something akin to RSIP.


Ian


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