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xen-users
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_______
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| _______________________________ |
| | | |
| | | |
==|=====|eth0 dom0 | |
| | | |
|_____|_____________________________|_____|
======================================================================
After bringing up a domU:
______P_h_y_s_i_c_a_l__M_a_c_h_i_n_e_______
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| _______________ |
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| | 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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