Mr Christopher,
I built a topology with the host acting as router betwen two uml guests.
Thanks for the tips. Each uml guest attached on a host tap device.
Host with ip forward + nat. UML guests with dns and default gateway
properly set. UML guests talking with each other and with the host
plus internet access. I even typed apt-get commands (using a debian
4.0 file system) to upgrade the UML guests.
I wonder if is possible have the same success with the arrangement below:
ppp(/oe) ppp(/oe)
UML
router(eth0)<------------------[swith/hub]------------------->UMLrouter(eth0)
I intend to install Quagga package in the UML guests to get an cisco
ios shell command interface to build the routes.
I think Mr Chris Marshall solution will work, but i wish not to
involve the host in the solution.
Anyway, I will give the return to the list as soon i test Mr Chris Solution.
Thanks you all.
H.Floyd
2007/6/14, Christopher Marshall <[EMAIL PROTECTED]>:
> Haywood:
>
> The simplest way to do that (have a host act like a router between guests)
> would be to use ethertap devices. Each guest would talk to to the host
> through a different tap device and the guests would each use eth0 on their
> side.
>
> That's just as if you had the host as a physical host with multiple ethernet
> ports and each guest plugged into a separate ethernet port on the host. A
> more textbook router setup than that is hard to come by ;-)
>
> The commands to create a setup like that look like this:
>
> (as root)
> modprobe tun
> chmod 666 /dev/net/tun
> tunctl -u umluser -t tap1
> tunctl -u umluser -t tap2
> tunctl -u umluser -t tap3
>
> (as umluser)
> linux ... eth0=tuntap,tap1 ...
> linux ... eth0=tuntap,tap2 ...
> linux ... eth0=tuntap,tap3 ...
>
> At this point you need a way to run ifconfig on the guests:
>
> uml linux guest 1:
> ifconfig eth0 10.0.1.2 netmask 255.255.255.0 up
> route add default gw 10.0.1.1
>
> uml linux guest 2:
> ifconfig eth0 10.0.2.2 netmask 255.255.255.0 up
> route add default gw 10.0.2.1
>
> uml linux guest 3:
> ifconfig eth0 10.0.3.2 netmask 255.255.255.0 up
> route add default gw 10.0.3.1
>
> Then, on the host:
> ifconfig tap1 10.0.1.1 netmask 255.255.255.0 up
> ifconfig tap2 10.0.2.1 netmask 255.255.255.0 up
> ifconfig tap3 10.0.3.1 netmask 255.255.255.0 up
>
> If you have ip_forwarding enabled on the host, the host and guests should
> all be able to ping each other.
>
> It's certainly possible to use pppd with hosts and guests but it is more
> complicated than the above. Especially if your end goal is to use uml as a
> test bed to experiment with routing scenarios.
>
> Automating the above with a script so you can easily scale the scenario is,
> of course, harder, but only as a scripting exercise. The uml mechanics are
> all contained in the above exmaple.
>
> Chris Marshall
>
> Haywood Floyd <[EMAIL PROTECTED]> wrote:
> I have the same question.
>
> I am writing scripts to building an uml based virtual tcp/ip network
> to my students.
> I wish have hosts playing the role of routers communicating with each
> other using ppp.
> It is possible ?
>
> Regards
> Ernani
>
> 2007/6/14, Mark :
> >
> > I've just started with UML and got Jeff's book (great!!!)
> >
> > My question is I've looked around, but don't understand why (page 54) says
> > that UML doesn't support PPP. Is pppd the problem and can I just use
> > something like slirp? (I did find a debian package with UML and slirp).
> >
> > Any help would be appreciated.
> >
> > thanks,
> >
> > Mark
> >
> >
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