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
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by DB2 Express
> Download DB2 Express C - the FREE version of DB2 express and take
> control of your XML. No limits. Just data. Click to get it now.
> http://sourceforge.net/powerbar/db2/
> _______________________________________________
> User-mode-linux-user mailing list
> User-mode-linux-user@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
>
>
-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/
_______________________________________________
User-mode-linux-user mailing list
User-mode-linux-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/
_______________________________________________
User-mode-linux-user mailing list
User-mode-linux-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
