Patch for iptables (Linux firewall)

[Ewan Meadows]

TBH I'm a bit useless at configuring iptables.  I just generated a
file that worked for me and chucked it in as an example file. If it
has problems feel free to fix them.  It may slow down networking a
tad, so could people check for this as well please.

> IPs can be spoofed though, but OK, it makes it harder
> to get in.
Isn't there something that can be turned on through /proc and in the
kernel to get around this?