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

[Andrew Olds <aolds@xxxxxxxxxx>]

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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