I respond to myself: Before in xen 3.0 this was okay: vif = [ 'mac=aa:dd:rr:ee:ss:11', 'mac=aa:dd:rr:ee:ss:22, bridge=xenbr1'] The first vif was implicitly attached to bridge 0 (xenbr0). BUT now in 3.1 this doesn't work anymore, you must explicitly give the "bridge=xenbr0" argument: vif = [ 'mac=aa:dd:rr:ee:ss:11, bridge=xenbr0', 'mac=aa:dd:rr:ee:ss:22, bridge=xenbr1'] beware... kfx wrote: > Hello, > > I have a big problem: > Dom0 is centos5.1, domU are centos5.1. My setup is really simple, the > only thing is that I give 3 nics to the domU so I use a modified network > script (which has worked since january... since fedora 6): > " > #!/bin/sh > dir=$(dirname "$0") > "$dir/network-bridge" "$@" vifnum=0 > "$dir/network-bridge" "$@" vifnum=1 > "$dir/network-bridge" "$@" vifnum=2 > " > > So I have updated my xen dom0 from 3.0.3-rc5-8.1.15.el5 to > 3.1.0-53.1.4.el5 (and kernel-xen 2.6.18-8.1.15.el5xen to > 2.6.18-53.1.4.el5xen) and now my domU cant access the network. The > interfaces are good in the domU, all seems to be ok but there are no > connectivity at all (no arp entries). This message shows up on the dom0 > each time I launch a domU: > > blkback: ring-ref 9, event-channel 7, protocol 1 (x86_64-abi) > > Do someone know what is happening ? this is very embarrassing after a > simple upgrade... Hopefully I have another identical server (Centos 5.0 > with 5.1 domUs) which is still in 3.0 but I cant stay not updated. > > Thanks for any help. > > xm info: > host : host.foo.com > release : 2.6.18-53.1.4.el5xen > version : #1 SMP Fri Nov 30 01:21:23 EST 2007 > machine : x86_64 > nr_cpus : 4 > nr_nodes : 1 > sockets_per_node : 2 > cores_per_socket : 1 > threads_per_core : 2 > cpu_mhz : 2992 > hw_caps : bfebfbff:20100800:00000000:00000180:0000641d > total_memory : 4095 > free_memory : 3246 > xen_major : 3 > xen_minor : 1 > xen_extra : .0-53.1.4.el5 > xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p > xen_pagesize : 4096 > platform_params : virt_start=0xffff800000000000 > xen_changeset : unavailable > cc_compiler : gcc version 4.1.2 20070626 (Red Hat 4.1.2-14) > cc_compile_by : mockbuild > cc_compile_domain : > cc_compile_date : Fri Nov 30 00:37:12 EST 2007 > xend_config_format : 2 > > > > _______________________________________________ > CentOS-virt mailing list > CentOS-virt at centos.org > http://lists.centos.org/mailman/listinfo/centos-virt