What is you actual problem? No networking or a strange ip? CentOS uses virbr0 as the default and dnsmasc is issuing ip's (192.168.1.x I believe) on this network (correct me if I'm wrong!). xenbr0 is bridging the normal network. I disabled the virbr0 using virsh and now all my domainU's use xenbr0. You can also specify what bridge to use in de domainU-config-file (/etc/xen/) Cheers, Bart Joseph L. Casale wrote: > Hi, > I tried this post on the Xen list first with no answer. I have 4 machines and 3 of which (all different) have no network access when booted into Xen. I tried using Fedora Core 8 and it produced the same results. Is it normal for the virbr0 interface to take an arbitrary IP? How does it decide what to use? An ifconfig when booted into Xen shows the following: > > eth0 Link encap:Ethernet HWaddr 00:0C:29:4A:69:63 > inet addr:192.168.5.30 Bcast:192.168.5.255 Mask:255.255.255.0 > inet6 addr: fe80::20c:29ff:fe4a:6963/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:25 errors:0 dropped:0 overruns:0 frame:0 > TX packets:9 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:0 > RX bytes:1763 (1.7 KiB) TX bytes:594 (594.0 b) > > lo Link encap:Local Loopback > inet addr:127.0.0.1 Mask:255.0.0.0 > inet6 addr: ::1/128 Scope:Host > UP LOOPBACK RUNNING MTU:16436 Metric:1 > RX packets:3 errors:0 dropped:0 overruns:0 frame:0 > TX packets:3 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:0 > RX bytes:336 (336.0 b) TX bytes:336 (336.0 b) > > peth0 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:28 errors:0 dropped:0 overruns:0 frame:0 > TX packets:21 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:1943 (1.8 KiB) TX bytes:1314 (1.2 KiB) > Interrupt:17 Base address:0x1400 > > vif0.0 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:9 errors:0 dropped:0 overruns:0 frame:0 > TX packets:25 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:0 > RX bytes:594 (594.0 b) TX bytes:1763 (1.7 KiB) > > virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00 > inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 > inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:0 > RX bytes:0 (0.0 b) TX bytes:468 (468.0 b) > > xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF > inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link > UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 > RX packets:34 errors:0 dropped:0 overruns:0 frame:0 > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:0 > RX bytes:1881 (1.8 KiB) TX bytes:0 (0.0 b) > > Thanks for any pointers! > jlc > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >