Re: [Xen-users] How to get eth0 & eth1 fox XEN domU's?

["Rudi Ahlers" <rudiahlers@xxxxxxxxx>]

On Fri, Nov 28, 2008 at 1:29 AM, Thomas Halinka <lists@xxxxxxxxx> wrote:
> Am Freitag, den 28.11.2008, 00:53 +0200 schrieb Rudi Ahlers:
>> On Thu, Nov 27, 2008 at 5:48 PM, Thomas Halinka <lists@xxxxxxxxx> wrote:
>> > Hi Rudi,
>> >
>> > Am Donnerstag, den 27.11.2008, 14:24 +0200 schrieb Rudi Ahlers:
>> >> Hi all,
>> >>
>> >> How is it possible to get a eth0 & eth1 for a XEN domU?
>> >
>> > jap,
>> >
>> >>  The reason I
>> >> ask, is that we need to monitor the bandwidth every XEN VPS uses, but
>> >> I don't want to count local bandwidth between VPS's, and between the
>> >> VPS & backup server.
>> >
>> > ok
>> >
>> >>
>> >> So, if all internet traffic gets routed on eth0, and IP rather
>> >> 196.34.x.x & internal traffic on eth1 & 192.168.10.x - how would I do
>> >> that?
>> >
>> > fire up 2 bridges:
>> > - xen-internal   (192.168.10.0)
>> > - xen-external   (public IPs)
>> >
>>
>> Can you please explain this to me in lay-man's terms? How do I do this
>> on the dom0?
>
> Supposing you have 2 Nics: eth0 and eth1
>
> eth0 = internet/router/outer-world
> eth1 = lan /private-net
>
> in dom0:
> cat /etc/network/interfaces
> # /etc/network/interfaces - network interfaces configuration
>
> # loopback interface
>
> auto lo
> iface lo inet loopback
>
> # ethernet interface
>
> auto eth0
> auto eth1
>
> auto external
> iface external inet static
>        address 192.34.x.x
>        netmask 255.255.255.0
>        bridge_ports eth0
>        bridge_fd 0
>        bridge_hello 2
>        bridge_maxage 12
>        bridge_stp off
>
> auto internal
> iface internal inet static
>        address 192.168.10.x
>        netmask 255.255.255.0
>        bridge_ports eth1
>        bridge_fd 0
>        bridge_hello 2
>        bridge_maxage 12
>        bridge_stp off
>
>
> domu.cfg:
> vif         =
> [ 
> 'ip=196.34.x.x,mac=00:16:3E:1B:D8:8D,bridge=external','ip=192.168.10.3,mac=00:16:3E:1B:D8:84,bridge=internal'
>  ]
>
>
> eth1 is not really needed, you also can use dummy-devices too.
>
>>
>> > With this you can do separated traffic-accounting for internal and
>> > external traffic.
>> >
>> >>
>> >> Currently when I look @ a domU, I have eth0, eth0:1 & eth0:2
>> >> (192.168.10.63) setup, but they all pass through the same interface
>> >> vifwise0 on the dom0 side,
>> >>
>> >>
>> >> vifwise0  Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
>> >>           inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>> >>           UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
>> >>           RX packets:1961043 errors:0 dropped:0 overruns:0 frame:0
>> >>           TX packets:2521537 errors:0 dropped:4218 overruns:0 carrier:0
>> >>           collisions:0 txqueuelen:32
>> >>           RX bytes:4195421597 (3.9 GiB)  TX bytes:1075982597 (1.0 GiB)
>> >>
>> >>
>> >> So, from the 3.9BG traffice transmitted, we don't know what is local &
>> >> what is internet traffic. I'd like to completely segment the traffic,
>> >
>> > because theres no separation and every traffic is transmitted over this
>> > bridge.
>> >
>> >> how can I do that?
>> >
>> > Im using traffic-accounting with iptables....
>>
>> How exactly do you do this?
>
> counting the packets which are transferred over the external-bridge ;)
>
> since my external bridge is the gateway for the hosts this was not a
> huge problem....
>
>> >
>> >
>> > hth,
>> >
>> > Thomas
>
>
> Thomas
>
>



Hi Thomas,

You kinda lost me a bit on this one. I use CentOS, so the config files
look a bit different. Let's stick to the more generic interface names.
So, if I have eth0 & eth1, how do I tell XEN to use those?

-- 

Kind Regards
Rudi Ahlers

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