If I'm following you right your UML is bridged to another IP address on
the same interface as the host.
You should be able to redirect your ssh connections with a single
iptables command to destination NAT the connection such as:
iptables -t nat -A PREROUTING -p tcp --destination realhost
--destination-port someport -j DNAT --to UMLip:UMLport
where realhost and someport are the IP address and port on the host and
UMLip and UMLport are the IP address and port the connection is going to
on the UML machine. The UMLport is optional, if it is omitted the
someport will be used.
This will work no matter what interface the uml machine is attached to
so long as the host can talk to the UML machine. Make sure your UML
pings first, if you haven't got that far yet.
Chip Schweiss
> -----Original Message-----
> From: kc043105 [mailto:kc043105@xxxxxxxxxxxxxxxx]
> Sent: Wednesday, October 29, 2003 8:12 PM
> To: user-mode-linux-user
> Subject: [uml-user] Networking with UML
>
>
> Im trying to setup a UML instance to act as a virtual machine
> on top of a
> real host. What id like to do is be able to ssh to
> realhost:someport and
> have it forwarded to the UML instance.
>
> I tried to follow the howto with little luck. I was able to
> create a tap
> device and setup a bridge but im not sure what to do with it,
> here are the
> commands i executed where $REAL_IP, $BROADCAST and $GW_IP are the ip
> addresses that the host server gets via dhcp on eth1.
>
> /sbin/modprobe tun
> /sbin/modprobe bridge
>
> brctl addbr br0
> /sbin/ifconfig eth1 0.0.0.0 promisc up
> /sbin/ifconfig br0 $REAL_IP netmask 255.255.255.0 broadcast
> $BROADCAST up
> brctl stp br0 off
> brctl setfd br0 1
> brctl sethello br0 1
> brctl addif br0 eth1
>
> tunctl -u root
> /sbin/ifconfig tap0 0.0.0.0 promisc up
> brctl addif br0 tap0
>
> route add default gw $GW_IP
>
> What should i do after this point?
>
> Thanks
>
> Cheers
>
> Kevin Conaway
>
>
>
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