Re: [uml-user] Networking with UML

[Kevin C. <kco...@uc...>]

I tried that do port forward ssh but it didnt work

iptables -t nat -A PREROUTING -p tcp -d realhost --dport 2200 -j DNAT 
--to uml_ip:22

I can ping the uml from the host and the host from the uml.  i can also 
ssh to the uml from the host.

Any other ideas why the port forwarding wouldnt work? Thanks

Kevin

ch...@in... wrote:

> 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:kc0...@ma...]
>>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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> 
> 
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-- 

Cheers

Kevin Conaway