With ipv6, every network interface always has a link local address. This fools the network script into thinking that xen-br0 already has a network address, and it refuses to transfer over eth0's IP address to xen-br0.

By grepping for 'inet ' instead of just 'inet', the network script is no longer fooled and does the right thing. This patch makes Xen networking work again on my Fedora system.

--- xen-unstable/tools/examples/network.orig 2005-01-24 10:57:45.000000000 -0500 +++ xen-unstable/tools/examples/network 2005-01-24 13:24:31.000000000 -0500 @@ -61,13 +61,13 @@ local src=$1 local dst=$2 # Don't bother if $dst already has IP addresses. - if ip addr show dev ${dst} | egrep -q '^ *inet' ; then + if ip addr show dev ${dst} | egrep -q '^ *inet ' ; then return fi # Address lines start with 'inet' and have the device in them. # Replace 'inet' with 'ip addr add' and change the device name $src # to 'dev $src'. Remove netmask as we'll add routes later. - ip addr show dev ${src} | egrep '^ *inet' | sed -e " + ip addr show dev ${src} | egrep '^ *inet ' | sed -e " s/inet/ip addr add/ s@\([0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+\)/[0-9]\+@\1@ s/${src}/dev ${dst}/