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xen-users
RE: [Xen-users] One physical NIC and multiple bridges
I followed this guide http://wiki.xensource.com/xenwiki/XenNetworkingExamples.
One of the caveats that was making it not working for me is that in Xen 3.2, the default bridge name is the name of the physical network card. E.g if you physical network card is eth0, then your bridge name is eth0. (see http://wiki.xensource.com/xenwiki/XenNetworking#head-708d4c55f42b5e2b866c06e1ae69530e8c748799) and compare 3.1 and 3.2 networking, especially bridge name.
Once I realized that the bridge name is my physical NIC name instead of xenbr0 or xenbr1, I was able to get them to work perfectly fine. The VMs that only has Dummy0 bridge (the one with local IP) is then NAT so that they can still access internet (for updates, installing packages, etc).
There's only 1 more caveat that I'm yet to solve: that is, I'm loosing source IP on the VMs. E.g. on my HTTP VM, when I access from remote, on Apache's access log, it is logged as connection from my Dom0 IP address instead of the real source IP address. It happen for all connections, not just HTTP.
Hope this helps.
MSN
> Date: Sat, 15 Nov 2008 09:28:34 -0500
> From: gordonthree@xxxxxxxxx
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] One physical NIC and multiple bridges
>
> What does your network setup script look like in /etc/xen/scripts?
>
> As far as I know, a bridge has to be tied to a device on the host, but
> that physical device doesn't need to be real. My host has four
> bridges on it, three of which are bound to real ethernet devices, the
> fourth is bound only to a dummy ethernet device.
>
> here's my network setup script, it lives in /etc/xen/scripts and gets
> auto-executed when xend starts up.
>
> # cat my-network-script
> #!/bin/sh
> dir=$(dirname "$0")
> "$dir/network-bridge" "$@" vifnum=0 netdev=eth0 bridge=xenbr0
> "$dir/network-bridge" "$@" vifnum=1 netdev=eth1 bridge=xenbr1
> "$dir/network-bridge" "$@" vifnum=2 netdev=eth3 bridge=xenbr2
> "$dir/network-bridge" "$@" vifnum=3 netdev=dummy1 bridge=xenbr3
>
> bridge3 is my 100% virtual network, which exists only in the memory on
> the host and not on my physical network. It's connected to my
> phyiscal network via a firewall DomU which only allows certain traffic
> to cross over.
>
> I hope this helps!
>
> -Gordon
>
> On Sat, Nov 15, 2008 at 8:41 AM, Tom Lobato <tomlobato@xxxxxxxxx> wrote:
> >
> > Hi all!
> >
> > There are several docs teaching how to configure multiple bridges
> > for Xen when you have multiple NICs.
> > Well, I want to simulate a environment with 4 machines, but only 2
> > must have internet access (through physical NIC on dom0), and others can
> > comunicate with each other. So, I need to make some additional bridges
> > UNrelated to my physical NIC on dom0.
> >
> > I tried to create it manually using:
> > brctl addbr br1
> > then, in domU 1 config:
> > vif = ... bridge=br1 ...
> > then, in domU 2 config:
> > vif = ... bridge=br1 ...
> >
> > When domU 1 and 2 boots up, it is attached to this bridge, as hoped,
> > but cant ping another domU connected to the same bridge.
> > A simple map of my domUs:
> >
> > domUs
> > ----------------------------------------
> > | isp1_server----|---physical_NIC
> > | | |
> > | client-----lan_server |
> > | | |
> > | isp2_server----|---physical_NIC
> > |________________________|
> >
> > Im I forgetting something? If you has a better approach to setup it,
> > please tell me.
> >
> >
> >
> >
> > Tom Lobato
> >
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
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