Re: [User-mode-linux-devel] uml ethernet interface - code

[James R. L. <jl...@mi...>]

On Sun, Apr 30, 2000 at 10:13:14PM -0400, Gerald Britton wrote:
> > I don't see an easy way for the ethertap-based virtual network to operate in
> > a host routed network. F.e. the host acts as the gateway to the uml private
> > network and provides firewall services (IP MASQ).
> 
> The way all this would work, the virtual net would look just like an ethernet
> to both the host system (as network interface tap0) and to the virtual systems
> (as network interface eth0) ... these can be treated as any other ethernet
> and if the host machine has an uplink connection, it can route between them.

By attaching to eth0 with a PF_PACKET socket you do not even need to configure
bridging on the host system.  I have that working right now, in fact, I'm
telnet'ed out of a uml right now :-)

I'm trying to get the tap0 to work as well.  I figure that can be used to
to implement the host system acting as a router (or firewall).

> If the host has an ethernet connection, the host can either route between the
> two, or it can setup bridging between the two networks so they seem to be one
> larger ethernet.  This allows arbitrary firewalling to be potentially setup
> between the real network and the virtual network, or it allows for the virtual
> network to act as if it were directly part of the real network.
> 
> 				-- Gerald

-- 
James R. Leu