Re: [uml-user] UML queries

[David C. <li...@ed...>]

Sriram Ramarathnam wrote:
> 1. How does the UMl switch between Virtual Machines.

Do you mean network packets or task/resource scheduling?

> 3. How does UML support networking.

There are a variety of ways, most include using a tun device on the host
and connecting it to the UML instance.  You can also use transports to
capture traffic on the host, etc.

See http://user-mode-linux.sourceforge.net/networking.html for a full
explanation of the different networking mechanisms.

See http://edeca.net/articles/bridging/ for a guide on networking UML
using bridging.

You can also apply routing (instead of bridging), which can be more
secure depending on your use for UML.

> 5. Is there a way to do a reliable packettrace from within a VM in UML,
> beacause i did a tcpdump from within a VM and it gave some junk data with
> ACK's out of order.

tcpdump should be fine as far as I know whether on the host or inside a
UML.  Inside the UML, network devices are labelled as on real machines
with names ethX.

If you can elaborate more on what you mean by "junk data" we might be
able to help some more.  pcap data files or tcpdump output would be useful.

David