missing open port for ntp

[Leon Bottou]

I found that the firewall prevent ntp from working.
Fixed by adding

# Allow ntp
-A INPUT -p udp --sport 123 -j ACCEPT

into iptables.up.rules.

It also seems that the firewall prevents netbios name resolution (so that we can open smb://mister/fat in nautilus) but I could not find a fix.