Speaker: Guido van Rooij

This talk will talk about various ways of filtering IP packets.
It will begin by explaining shortly what TCP/IP packets look
like. Using this, the talk will continue with explaining:
1. Why is packet filtering useful.
2. In what ways the various headers field in TCP/IP packet
headers can be used to filter.
3. Stateless versus stateful filtering. As the author is involved
in the development of IP-filter, also its special TCP filtering
method will be covered.
4. What other methods are used (e.g. Firewall-1 stateful
The talk will be aimed towards network administrators that
like to know more about the inner workings of packet filtering.