Re: [Xen-devel] xen-unstable networking

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

> With this configuration, the packets will go out on the wire
> directly as you've told it that the whole 192.168.101.0/24 subnet
> is directly accessible from eth0
> 
> Try setting the ip addresses for domains >0 to
> e.g. 192.168.101.1/32 and then set the default route to go via
> gateway 192.168.101.254
> 
> I haven't tried this, but it should force all packets to go via
> domain 0 rather than out via the LAN. (You could set a gateway
> just for 192.168.101.0/24 if you wanted other packets to go on
> the LAN directly)
> 
> Ian

No, this won't work -- the gotcha is that Xen is forwarding packets
based on IP address, not MAC address. This approach will force the
destination MAC address of packets to DOM0's MAC address, but not teh
IP address. Unless the dest IP address belongs to another domain
running on the machine, the packets will still end up on the physical
wire. 

Also, 192.168.101.254 isn't in 192.168.101.1/32, so I'm not sure this
setup would even get that far --- how would the domain ARP for domain
0's MAC address?

 -- Keir


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