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LB/2002
LB/2001
The BLUG
Speaker Name Harald Welte
Company
Talk Title netfilter/iptables firewalling internals
Track Development
Scope Technical
Synopsis The Linux 2.4.x kernel series has introduced a totally new kernel firewalling subsystem. It is much more than a plain successor of ipfwadm or ipchains.

The netfilter/iptables project has a very modular design and it's sub-projects can be split in several parts: netfilter, iptables, connection tracking, NAT and packet mangling.

While most users will already have learned how to use the basic functions of netfilter/iptables in order to convert their old ipchains firewalls to iptables, there's more advanced but less used functionality in
netfilter/iptables.

The presentation covers the design principles behind the netfilter/iptables implementation. This knowledge enables us to understand how the individual parts of netfilter/iptables fit together, and for which potential applications this is useful.
Speaker Profile Harald Welte is one of the five netfilter/iptables core team members, and the current Linux firewalling maintainer. His main interest in computing has always been networking. In the few time left besides netfilter/iptables related work, he's writing obscure documents like the UUCP over SSL HOWTO. Other kernel-related projects he has been contributing are user mode linux and the international (crypto) kernel patch. In the past he has been working as an independent IT Consultant working on closde-source projects for various companies ranging from banks to manufacturers of networking gear. During the year 2001 he was living in Curitiba (Brazil), whre he got sponsored for his Linux related work by Conectiva Inc. Since February 2002, Harald has been contracted part-time by Astaro AG, who are sponsoring him for most of his current netfilter/iptables work. Harald is living in Berlin, Germany.
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