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<H2><A NAME="s5">5.</A> <A HREF="packet-filtering-HOWTO.html#toc5">Rusty's Really Quick Guide To Packet Filtering</A></H2>

<P>Most people just have a single PPP connection to the Internet, and
don't want anyone coming back into their network, or the firewall:</P>
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<PRE>
## Insert connection-tracking modules (not needed if built into kernel).
# insmod ip_conntrack
# insmod ip_conntrack_ftp

## Create chain which blocks new connections, except if coming from inside.
# iptables -N block
# iptables -A block -m state --state ESTABLISHED,RELATED -j ACCEPT
# iptables -A block -m state --state NEW -i ! ppp0 -j ACCEPT
# iptables -A block -j DROP

## Jump to that chain from INPUT and FORWARD chains.
# iptables -A INPUT -j block
# iptables -A FORWARD -j block
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