Re: [uml-devel] A set of patches uploaded to sourceforge

[Henrik N. <hn...@ma...>]

Lennert Buytenhek wrote:

> > Sidenote: Persistent TAP devices (ethertap)
>
> No. There are two different things. Check http://vtun.sourceforge.net/ (IIRC).

Ok. Found the persistent TUN/TAP device patch. Quite well hidden thing...

Solves some issues, but the um_eth_serv approach is still simpler when playing with complex
network setups as there is no need to create the tun/tap devices or to set up bridging on
the host. Just start the um_eth_serv daemon as some user, and your uml nodes have an
"unlimited" number of ethernet segments they can attach to.

The persistent TUN/TAP device + multiple bridges (which I presume the bridging kernel can
support) allows you to create something similar to a vlan switch with a number of virtual
ports (the configured TUN/TAP devices). You can then start your uml nodes and attach them
to ports on this switch.

With um_eth_serv, you have a unlimited number of hubs (each with unlimited number of
invisible ports) your uml nodes can connect to by telling which etherne-lan the node want
to be member of. There is no equivalence of "port", only ethernet-lan.

/Henrik