Re: Re: [Xen-users] DomU networking help please

[Andrew Olds <aolds@xxxxxxxxxx>]

All working and very cool.
Here is what I did.
Changed the domu address to 10.0.0.15 so in same subnet as dom0.
didn't need to restart xend after all and in fact this adds the dom0 eth0 
address to the bridge which although you can ping all around causes major 
routing probs when trying to use ssh or vnc.
so step by step this is what I did.
1. boot dom0
2. /etc/xen/scripts/network start
3 xm create RHL 
4 /etc/xen/scripts/vif-bridge up domain=RHL vif=vif1.0 bridge=xen-br0 
mac="aa:bb:cc:dd:00:11"
and thats it.
I can now VNC and even do a full Centos update from within the session.
Navigating the X session takes a bit of getting used to but otherwise Xen rocks.


Yes you are all right I had to change to 10.0.0.15 and also see my previous 
reply about additional steps.
Its all working now. 
Next challenge, try to get VNC working. :)

> 
> From: Marcus Brown <marcusbrutus@xxxxxxxxxxxxxxxx>
> Date: 2005/10/07 Fri PM 01:02:18 GMT+13:00
> To: Andrew Olds <aolds@xxxxxxxxxx>
> CC: Kent Watsen <kent@xxxxxxxxxx>,  xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] DomU networking help please
> 
> Andrew Olds wrote:
> > I have tried that and no joy.
> > What I really want to know is which device in dom0 correlates to the eth0 
> > in domU
> 
> the vif (virtual interface)
> 
> > and do I need to attach an IP address to it.
> 
> no, dom0 has the vif attached to the bridge, the bridge needs an IP
> 
> > I'm sorry but I just need someone to explain in basic terms how it hangs 
> > together.
> > I realise I am probably doing something fundementally wrong here. I just 
> > can't figure out what it is.
> > 
> >>They appear to be on different subnets - are you using an external 
> >>router?  - if so, make sure you have a default route to the gateway, 
> >>otherwise try setting the DomU's IP to something the in the Dom0's 
> >>network...
> >>
> I agree, the IP address of domU should be in the same subnet as dom0
> (as you are bridging, not routing)
> eg. something like 10.0.0.6
> 
> >>
> >>>Hi please forgive this if it seems a dumb question but I am new to xen and 
> >>>linux.
> >>>I have Xen running in Centos and another Centos Partition DomU running.
> >>>But I cannot seem to get networking running between 0 and U.
> >>>All the doco appears to assume you know everything about networking 
> >>>bridging and the like.
> >>>Does anyone have a simple how to step by step on how to get a single dom0 
> >>>talking to a single DomU.
> 
> I guess the docs are as simple as it gets :) ...
> ie. networking becomes simpler with experience
> 
> >>>All I am looking for is a really simple explanation of what all the 
> >>>interfaces do
> >>>and how to get the doms talking to each other.
> 
> here's my attempt to explain bridging:
> 
> ======================================================================
> 
> Before booting any domUs:
> 
>     ______P_h_y_s_i_c_a_l__M_a_c_h_i_n_e_______
>     |                                         |
>     |                                         |
>     |                                         |
>     |                                         |
>     |                                         |
>     |                                         |
>     |                                         |
>     |                                         |
>     |                                         |
>     |                                         |
>     |                                         |
>     |     _______________________________     |
>     |     |                             |     |
>     |     |                             |     |
>   ==|=====|eth0         dom0            |     |
>     |     |                             |     |
>     |_____|_____________________________|_____|
> 
> 
> 
> ======================================================================
> 
> After bringing up a domU:
> 
>     ______P_h_y_s_i_c_a_l__M_a_c_h_i_n_e_______
>     |                                         |
>     |                                         |
>     |                                         |
>     |          _______________                |
>     |          |             |                |
>     |          |    domUn    |                |
>     |       ___|             |                |
>     |      /   |eth0         |                |
>     |     /    |             |                |
>     |  vifn.x  |_____________|                |
>     |   /                                     |
>     |  |  _______________________________     |
>     |  |  |                             |     |
>     |  |  |                             |     |
>   ==|==+==|eth0         dom0            |     |
>     | br0 |                             |     |
>     |_____|_____________________________|_____|
> 
> IN DOM0:
> - br0 (or xen-br0) is assigned the IP of eth0
> - vifn.x is tied to the bridge (br0)
> - neither vifn.x or eth0 require IP addresses now
> 
> 
> ======================================================================
> 
> Some commands that might help:
> brctl show
> ifconfig -a
> route -n
> 
> Each of which has an excellent manpage, eg:
> man brctl
> 
> Also of help:
> http://wiki.xensource.com/xenwiki/XenNetworking
> http://www.siliconvalleyccie.com/linux-hn/network-intro.htm
> http://bridge.sourceforge.net/faq.html
> 
> 
> Hope that helps a little,
> 
> Marcus.
>


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