[root@localhost scripts]# sh network-bridge start
Link veth is missing.
This may be because you have reached the limit of the number of interfaces
that the loopback driver supports. If the loopback driver is a module, you
may raise this limit by passing it as a parameter (nloopbacks=<N>); if the
driver is compiled statically into the kernel, then you may set the parameter
using loopback.nloopbacks=<N> on the domain 0 kernel command line.
[root@localhost scripts]# cat /boot/grub/menu.lst
timeout 5
color black/cyan yellow/cyan
shade 1
viewport 3 2 77 22
splashimage (hd0,0)/boot/grub/splash.xpm.gz
default 0
title xen0
kernel (hd0,0)/boot/xen.gz dom0_mem=512000
module (hd0,0)/boot/vmlinuz-xen0 root=/dev/sda1 loopback.nloopbacks=50 ro
title linux
kernel (hd0,0)/boot/vmlinuz root=/dev/sda1 resume=/dev/sda7
initrd (hd0,0)/boot/initrd.img