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Sometime ago we had this conversation about how to do dynamic creation
of UMLs, particularly for laptop development environments.
Blaisorblade <[EMAIL PROTECTED]> writes:
> b) pre-setup a tap0 interface (possibly you'll want to run uml_switch to
> connect all UMLs to this tap0 device) so that you can run the DHCP server
> before starting UMLs.
Can you explain this a bit more?
I'll explain why.
My laptop uml setup works really well... I can create UMLs on the fly
with one command.
But I can't start more than one at once and get a network device and I
want to be able to.
Here's (roughly) my current bootscript:
umlkernel \
ubd0=localcow,/someplace/umlfs \
ubd1=/someplace/swap \
eth0=tuntap,umltap
umltap is a tuntap which is preconfigured at host OS boot time. I have
a dhcp server listening on the tuntap interface.
If I try to boot two UMLs simultaneously then one of them doesn't get
a network.
So, first question: do I need a new tun device for every UML I start?
If I create a new tuntap device and pass it to the UML line, thus:
tunctl -t umltap2
ifconfig umltap2 192.168.1.4 up
route add -host 192.168.1.4 dev umltap2
bash -c 'echo 1 > /proc/sys/net/ipv4/conf/umltap2/proxy_arp'
arp -Ds 192.168.1.4 umltap pub
I can ping from the host to the new tuntap.
I can bring up the eth in the new uml manually and ping to the host OS
but DHCP allocation inside the UML does not work.
My second question is: can uml_switch help me make tuntap's on the fly
and connect them all together?
Nic Ferrier
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