Hello you all out there Does anybody know the definite guide to create a dummy ethernet device? So, what I want to have is an ethernet device, without a physical link, or so called a dummy device. My goal is to have apache with mod_proxy and balancer running on peth0 in dom0. Apache is spreading my connection to the backend domU''s, where the webservices are running. The connection between the dom''s should go on dom0 over the dummy interface and they are all connected over a bridge. Hope the following ascii-art explains it a little bit better: ¦¦ ------------------------------------------------------------- | peth0 | | DOM0 | | | | tun0 (dummy dev) | | xenbr1 | |---------------------------------------------------------- | | eth0 | eth0 | | domU | domU | | _____________|____________________| I tried with tun to setup the stuff, but I''ve got several problems. I search a lot in the internet, but I didn''t find a good documentation. So my question is, how to setup cleanly such a dummy device. Any help or link to documentation is welcome! Thanks a lot for your help bye Philipp ==============================================Philipp Jäggi SNCT Sandweiler bp 23 L-5230 Sandweiler mailto: philipp [dot] jaeggi [at] snct [dot] lu _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hello Patrick Thanks a lot for this input, but my question goes more in the direction, how you should setup your system, so that everything starts up automatically. I can''t execute your steps by hand on a productive server and to write a shell script, which I let run in rc.local, is from my view also not so a clean solution. That''s why my question goes for a definite guide to setup such network configurations. Can I do this steps with ifcfg-xxxx files, how do I create a second bridge in a clean way and how do I arrage the assignement of the vif to the bridges. All this is just about the setup of dom0. So, the question is not how to do it, it how to do it clean and propper on a Fedora Core 4 system. Thanks a lot for all ideas. If a lot of good proposal will come in, I will try to find the time to write such a guide and post it to this mailing list. Thanks a lot for all the hints and links. bye Philipp Patrick Wolfe <pwolfe@employease.com> 03/13/2006 03:29 PM To Philipp Jäggi <philipp.jaggi@snct.lu> cc Subject Re: [Xen-users] Dummy ethernet device setup Just use veth1/vif0.1 as your connection from dom0 to xenbr1: brctl addif vif0.1 ip link set veth1 address 00:16:3e:f1:e2:d3 arp on up ip addr add 192.168.1.1/24 dev veth1 to remove it: ip link set veth1 down ip addr flush dev veth1 brctl delif vif0.1 On Mon, 2006-03-13 at 10:09 +0100, Philipp Jäggi wrote:> > Hello you all out there > > Does anybody know the definite guide to create a dummy ethernet > device? > > So, what I want to have is an ethernet device, without a physical > link, or so called a dummy device. My goal is to have apache with > mod_proxy and balancer running on peth0 in dom0. Apache is spreading > my connection to the backend domU''s, where the webservices are > running. The connection between the dom''s should go on dom0 over the > dummy interface and they are all connected over a bridge. Hope the > following ascii-art explains it a little bit better: > > > ¦¦ > ------------------------------------------------------------- > | peth0 | > | DOM0 | > | | > | tun0 (dummy dev) | > | xenbr1 | instead of dummy > |---------------------------------------------------------- | > | eth0 | eth0 | > | domU | domU | > | _____________|____________________| > > > I tried with tun to setup the stuff, but I''ve got several problems. I > search a lot in the internet, but I didn''t find a good documentation. > So my question is, how to setup cleanly such a dummy device. Any help > or link to documentation is welcome! Thanks a lot for your help > > > bye Philipp > > ==============================================> Philipp Jäggi > SNCT Sandweiler > bp 23 > L-5230 Sandweiler > > mailto: philipp [dot] jaeggi [at] snct [dot] lu > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users-- Patrick Wolfe (pwolfe@employease.com) _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Never tried it but could you do it with bridges? You can add the ip to the xenbr1 with brctl addbr xenbr1 ifconfig xenbr1 192.168.10.1 netmask 255.255.255.0 up John ________________________________ From: xen-users-bounces@lists.xensource.com [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of "Philipp Jäggi" Sent: Monday, March 13, 2006 4:09 AM To: xen-users@lists.xensource.com Subject: [Xen-users] Dummy ethernet device setup Hello you all out there Does anybody know the definite guide to create a dummy ethernet device? So, what I want to have is an ethernet device, without a physical link, or so called a dummy device. My goal is to have apache with mod_proxy and balancer running on peth0 in dom0. Apache is spreading my connection to the backend domU's, where the webservices are running. The connection between the dom's should go on dom0 over the dummy interface and they are all connected over a bridge. Hope the following ascii-art explains it a little bit better: ------------------------------------------------------------- | peth0 | | DOM0 | | | | tun0 (dummy dev) | | xenbr1 | |---------------------------------------------------------- | | eth0 | eth0 | | domU | domU | | _____________|____________________| I tried with tun to setup the stuff, but I've got several problems. I search a lot in the internet, but I didn't find a good documentation. So my question is, how to setup cleanly such a dummy device. Any help or link to documentation is welcome! Thanks a lot for your help bye Philipp ==============================================Philipp J䧧i SNCT Sandweiler bp 23 L-5230 Sandweiler mailto: philipp [dot] jaeggi [at] snct [dot] lu _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
You can look at this for a bridging guide http://www.linux.com/howtos/BRIDGE-STP-HOWTO/practical-example.shtml Which also has some init scripts. John ________________________________ From: xen-users-bounces@lists.xensource.com [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of "Philipp Jäggi" Sent: Monday, March 13, 2006 10:44 AM To: Patrick Wolfe Cc: Xen-users@lists.xensource.com Subject: Re: [Xen-users] Dummy ethernet device setup Hello Patrick Thanks a lot for this input, but my question goes more in the direction, how you should setup your system, so that everything starts up automatically. I can't execute your steps by hand on a productive server and to write a shell script, which I let run in rc.local, is from my view also not so a clean solution. That's why my question goes for a definite guide to setup such network configurations. Can I do this steps with ifcfg-xxxx files, how do I create a second bridge in a clean way and how do I arrage the assignement of the vif to the bridges. All this is just about the setup of dom0. So, the question is not how to do it, it how to do it clean and propper on a Fedora Core 4 system. Thanks a lot for all ideas. If a lot of good proposal will come in, I will try to find the time to write such a guide and post it to this mailing list. Thanks a lot for all the hints and links. bye Philipp Patrick Wolfe <pwolfe@employease.com> 03/13/2006 03:29 PM To Philipp J䧧i <philipp.jaggi@snct.lu> cc Subject Re: [Xen-users] Dummy ethernet device setup Just use veth1/vif0.1 as your connection from dom0 to xenbr1: brctl addif vif0.1 ip link set veth1 address 00:16:3e:f1:e2:d3 arp on up ip addr add 192.168.1.1/24 dev veth1 to remove it: ip link set veth1 down ip addr flush dev veth1 brctl delif vif0.1 On Mon, 2006-03-13 at 10:09 +0100, Philipp J䧧i wrote:> > Hello you all out there > > Does anybody know the definite guide to create a dummy ethernet > device? > > So, what I want to have is an ethernet device, without a physical > link, or so called a dummy device. My goal is to have apache with > mod_proxy and balancer running on peth0 in dom0. Apache is spreading > my connection to the backend domU's, where the webservices are > running. The connection between the dom's should go on dom0 over the > dummy interface and they are all connected over a bridge. Hope the > following ascii-art explains it a little bit better: > > > > ------------------------------------------------------------- > | peth0 | > | DOM0 | > | | > | tun0 (dummy dev) | > | xenbr1 | instead of dummy > |---------------------------------------------------------- | > | eth0 | eth0 | > | domU | domU | > | _____________|____________________| > > > I tried with tun to setup the stuff, but I've got several problems. I > search a lot in the internet, but I didn't find a good documentation. > So my question is, how to setup cleanly such a dummy device. Any help > or link to documentation is welcome! Thanks a lot for your help > > > bye Philipp > > ==============================================> Philipp J䧧i > SNCT Sandweiler > bp 23 > L-5230 Sandweiler > > mailto: philipp [dot] jaeggi [at] snct [dot] lu > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users-- Patrick Wolfe (pwolfe@employease.com) _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Philipp, as far as I understand it a dummy device does not transport packets, but accepts them and sends them to /dev/null. Your setup very much looks like the standard setup: Your dom0 and domUs are connected to a bridge, and Apache (with the IP of dom0) acts as a proxy for the domUs. In the place of the dummy xen automatically sets up a vif. Is there any special reason why you want a dummy device in your setup? Dirk Philipp Jäggi schrieb:>Hello you all out there > >Does anybody know the definite guide to create a dummy ethernet device? > >So, what I want to have is an ethernet device, without a physical link, or >so called a dummy device. My goal is to have apache with mod_proxy and >balancer running on peth0 in dom0. Apache is spreading my connection to >the backend domU''s, where the webservices are running. The connection >between the dom''s should go on dom0 over the dummy interface and they are >all connected over a bridge. Hope the following ascii-art explains it a >little bit better: > > > ¦¦ >------------------------------------------------------------- >| peth0 | >| DOM0 | >| | >| tun0 (dummy dev) | >| xenbr1 | >|---------------------------------------------------------- | >| eth0 | eth0 | >| domU | domU | >| _____________|____________________| > > >I tried with tun to setup the stuff, but I''ve got several problems. I >search a lot in the internet, but I didn''t find a good documentation. So >my question is, how to setup cleanly such a dummy device. Any help or link >to documentation is welcome! Thanks a lot for your help > > >bye Philipp > >==============================================>Philipp Jäggi >SNCT Sandweiler >bp 23 >L-5230 Sandweiler > >mailto: philipp [dot] jaeggi [at] snct [dot] lu > > >------------------------------------------------------------------------ > >_______________________________________________ >Xen-users mailing list >Xen-users@lists.xensource.com >http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hello Philipp, Philipp Jäggi schrieb:>So, my question is about how to setup cleanly the bridges, the veth2. I >don''t want to create a shell script that makes all the necessary steps as >I perform it in the shell. So where do I specify the bridge configuration, > >You can setup a bridge in /etc/network/interfaces (or wherever your interfaces are described in your distro) like any other interface. I have used that on my home firewall, e.g.:> auto xen-br0 > iface xen-br0 inet static > address 192.168.137.254 > # hwaddress ether 00:00:00:78:bd:01 > netmask 255.255.255.0 > network 192.168.137.0 > broadcast 192.168.137.255 > pre-up brctl addbr xen-br0 > post-down brctl delbr xen-br0Only assigning the MAC address to the bridge seems not to work, everything else does. Of course you have to disable the bridge-setup-script xen uses when starting. I did not bother to find out if xen can be forced not to start a networking script at all, so I simply added "exit 0" to the beginning of the bridged networking script - that is quick and dirty and works.>where do I store the veth2 config? >I would write that into the config file for the domX.>My idea about is at the moment, to >create a folder /etc/sysconfig/xen-nework, where I store the bridge >information and the ifcfg-veth2. But for this I need a wrapper scripts >that start all up cleanly, something like /etc/rc.d/init.d/xen-network. By >my problem is, to find the right point in the XEN startup process, where I >have to start the network. >That was the reason why I set up the bridge as interface with the base system.>Because Xen itself start also the network for >eth0 and eth1. This I would like to take out of the /etc/rc.d/init.d/xend >script and paste it into my xen-network script, so that finally everything >that belongs to network is started in one block. > >I have to do this issues, because in a productive environment with just a >couple of people working in the IT and high security requirements, >configuration safety is everything. >Let''s say, nowadays security is everything - everywhere. But nevertheless: you could add the domUs to the bridge connected to the physical interface and have a firewall on every domU (I use shorewall for that kind of setup). Or have a firewall in dom0 and NAT the traffic to the domUs. Or push the physical interface in a domU that is a separate firewall of its own.>That why the whole system will be >administrated with the help of cfengine. >What is cfengine? What does it help concerning security? I am quite interested in these things.> As a result of this I have to >separate and concernat everything in clean blocks of config files and >startup scripts. To do this I requested a guide to clean xen network >setup, where everything works after the bootsquence... :-) > > >Hope you can still help me... > >We will see. :-) At least I can try. By the way, if we keep the discussion on the list there will be more input from experienced people - there are quite some people out there having solved the same problems. Dirk> >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Dear Dirk As I saw out of your email, you are using debian, or a debian clone. Your setup that you propose to me is debian specific and mine is Fedora or Redhat specific. That''s why I trying to separate the xen networking part in a single block, so that I have finally a platform independent solution, or at least a solution which is easy to adapt. At the moment I am working with Fedora, but the productive environment can be on Redhat or Suse (hopefully not Suse). But when we go on with the virtualisation process, I have to work with sun solaris. If I do there a complete new type of setup it''s not easy for my colleges to work with my setup. I myself know surely the differences, but the others ... The next point is that I use cfengine. Cfengine is a tool for managing configuration files. You can use it for every linux distribution, bsd, solaris, hpux, aix... But before using cfengine, you have to standardize your setup of the servers. For more information check this site www.cfengine.org That why I tried to bring up this discussion about a clean xen network setup. And still the questions are, when to start the xen network, what to take out in the xend script, where to store the config files.... Thanks a lot for your inputs, Dirk. bye Philipp ==============================================Philipp Jäggi SNCT Sandweiler bp 23 L-5230 Sandweiler mailto: philipp.jaeggi@snct.lu "Dirk H. Schulz" <dirk.schulz@kinzesberg.de> 03/14/2006 10:11 AM To Philipp Jäggi <philipp.jaggi@snct.lu>, xen-users@lists.xensource.com cc Subject Re: [Xen-users] Dummy ethernet device setup Hello Philipp, Philipp Jäggi schrieb:>So, my question is about how to setup cleanly the bridges, the veth2. I >don''t want to create a shell script that makes all the necessary steps as>I perform it in the shell. So where do I specify the bridgeconfiguration,> >You can setup a bridge in /etc/network/interfaces (or wherever your interfaces are described in your distro) like any other interface. I have used that on my home firewall, e.g.:> auto xen-br0 > iface xen-br0 inet static > address 192.168.137.254 > # hwaddress ether 00:00:00:78:bd:01 > netmask 255.255.255.0 > network 192.168.137.0 > broadcast 192.168.137.255 > pre-up brctl addbr xen-br0 > post-down brctl delbr xen-br0Only assigning the MAC address to the bridge seems not to work, everything else does. Of course you have to disable the bridge-setup-script xen uses when starting. I did not bother to find out if xen can be forced not to start a networking script at all, so I simply added "exit 0" to the beginning of the bridged networking script - that is quick and dirty and works.>where do I store the veth2 config? >I would write that into the config file for the domX.>My idea about is at the moment, to >create a folder /etc/sysconfig/xen-nework, where I store the bridge >information and the ifcfg-veth2. But for this I need a wrapper scripts >that start all up cleanly, something like /etc/rc.d/init.d/xen-network.By>my problem is, to find the right point in the XEN startup process, whereI>have to start the network. >That was the reason why I set up the bridge as interface with the base system.>Because Xen itself start also the network for >eth0 and eth1. This I would like to take out of the /etc/rc.d/init.d/xend>script and paste it into my xen-network script, so that finallyeverything>that belongs to network is started in one block. > >I have to do this issues, because in a productive environment with just a>couple of people working in the IT and high security requirements, >configuration safety is everything. >Let''s say, nowadays security is everything - everywhere. But nevertheless: you could add the domUs to the bridge connected to the physical interface and have a firewall on every domU (I use shorewall for that kind of setup). Or have a firewall in dom0 and NAT the traffic to the domUs. Or push the physical interface in a domU that is a separate firewall of its own.>That why the whole system will be >administrated with the help of cfengine. >What is cfengine? What does it help concerning security? I am quite interested in these things.> As a result of this I have to >separate and concernat everything in clean blocks of config files and >startup scripts. To do this I requested a guide to clean xen network >setup, where everything works after the bootsquence... :-) > > >Hope you can still help me... > >We will see. :-) At least I can try. By the way, if we keep the discussion on the list there will be more input from experienced people - there are quite some people out there having solved the same problems. Dirk> >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
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