Rolling shells

yesterday i run true a weird situation. After installing fresh DomU with xen-image-create via debootstrap, I noticed that its ipbtales is not working giving the following:

WARNING: Could not open 'kernel/net/netfilter/x_tables.ko': No such file or directory
FATAL: Could not open 'kernel/net/ipv4/netfilter/ip_tables.ko': No such file or directory
iptables v1.3.6: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

anyway its very easy to fix and i just decided to share the info, just type a simple command:

depmod