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Configuring dummy0 using none tocreate none on web,windows code 39 generator dummy0 is a virtua none for none l interface that has the full functionality of a real physical network interface. We create dummy0 in the driver domain. There is essentially no difference between a physical network interface and dummy0 except that the physical interface has a physical device attached to it but dummy0 does not.

Using dummy0, we set up the virtual network that is absolutely isolated from the Internet but allows the driver domain and the guest domains to communicate internally. Figure 10.20 shows a virtual device view of setting up Xen dummy0 interface.

. iPad Figure 10.20. The vifs are hooked to Xen virtual network upon the dummy0. [View full size image]. To set up a dummy0 interface in the driver domain, follow these steps: 1. Create a dummy0 interface in the driver domain. The way to create a dummy0 interface may vary due to different Linux distributions.

But the configuration parameters are similar. Here, we take Fedora/CentOS as an example. Create a new interface file: ifcfgdummy0.

Inside the file, configure it as shown in Listing 10.25..

Listing 10.25. Configuration for dummy0 Interface in Fedora in File ifcfg-dummy0 DEVICE = dummy0 BO OTPROTO=none 0NBOOT=yes USERCTL=no IPV6INIT=no PEERDNS=yes TYPE=Ethernet NETMASK=255.255.255.

0 IPADDR=10.1.1.

1 ARP=yes. In Listing 10.25, none none it specifies the new interface"s name, which is dummy0, and its related network properties, such as that the IP address is 10.1.

1.1 and the netmask is 255.255.

255.0. For the other distributions, we give some hints:.

In OpenSUSE, set the value of SETUPDUMMYDEV to yes in the file /etc/rc.config. In Ubuntu/Debian, add an interface in the file /etc/network/interfaces. In Gentoo, before compiling the kernel, choose Networking support ->Network device support ->Dummy net driver support to be [m].. Listing 10.26 show none for none s two links that we must also add to the file /etc/modprobe.conf to load the dummy0 module when the driver domain boots.

. Listing 10.26. The dummy0 Module Entry alias dummy0 dummy options dummy numdummies=1 Set up an internal bridging network based on dummy0. Set up the bridging mode virtual network and attach dummy0 to the virtual bridge xenbr0. In the Xend configuration file, specify the network device as dummy0 in the network-script directive, as shown in Listing 10.

27. It will be combined with the virtual bridge xenbr0..

Listing 10.27. Xend Configuration to Bind dummy0 (network-script "n etwork-bridge netdev=dummy0"). Attach dummy0 to t none for none he guest domain"s virtual interface. When configuring the guest domain"s configuration file, attach the guest domain"s virtual interface to the bridge in the vif directive as in the bridge mode. The vif parameter to attach the guest vif to the bridge in the guest configuration file is shown in Listing 10.

28.. Listing 10.28. The Guest Domain Configuration to Bind dummy0 vif=["bridge=xenbr0",]. Testing dummy0 This internal virt none none ual network isolates the guest domains from the Internet because there is no physical interface attached to it. It is pingable between the driver domain and guest domains, and you can see its interface in the driver domain as shown in Listing 10.29.

Listing 10.29. dummy0 Interface in the driver domain.

dummy0 Link encap:Etherne none none t HWaddr 16:31:10:26:BD:EF inet addr:10.1.1.

1 Bcast:10.1.1.

255 Mask:255.255.255.

0 inet6 addr: fe80::1431:10ff:fe26:bdef/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:29 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:7738 (7.5 KiB).

Now it is clear that the dummy0 interface"s IP is as specified in Listing 10.25. Configuring Dummy Bridge The other kind of virtual network segment disconnects the driver domain from the guest domains. Guest domains are hooked to a dummy bridge interface. Figure 10.

21 shows a virtual device view of setting up Xen"s dummy bridge. Only the guest domains connect to each other. To do this, we need to set up a virtual bridge that only guest domains" virtual interfaces can connect to.

This virtual network is an isolated network that keeps guest domains from interacting with the driver domain and the Internet.. Figure 10.21. Guest domains are hooked to the dummy bridge interfaces. [View full size image]. To set up the dummy bridge, the following steps should be followed. Set up the virtual bridge by using the brctl command provided by the bridge-utils package. We can either put the commands shown in Listing 10.30 in our own script or just run them on the command line.

. Listing 10.30. xenbr1 Setup Command brctl addbr xenbr1 brctl stp xenbr1 off brctl setfd xenbr1 0 ip link set xenbr1 up brctl"s suboption none none addbr creates a logical bridge with the bridge name xenbr1. stp disables xenbr1"s communication with the other bridges to avoid interference, setfd sets the bridge"s listening and learning state time to be 0, and ip link set activates the dummy bridge. This change will not persist after reboot.

If you want to maintain the configuration, it is better to put in a script that will run during boot up. You can refer to the brctl and ip man pages for more information. 2.

List the network interfaces in the driver domain, and a new bridge interface xenbr1 shows up, as shown in Listing 10.31..

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