By Jacek Artymiak

Name: development Firewalls with OpenBSD and PF, 2d ed.

Author: Jacek Artymiak

pages: 336

Written through Jacek Artymiak, a common contributor to ONLamp.com, development Firewalls with OpenBSD and PF is the 1st and in basic terms print ebook committed exclusively to the topic of the pf packet filter out utilized in OpenBSD, FreeBSD, and NetBSD working structures. subject matters lined comprise: firewall layout, ruleset syntax, packet normalization (scrubbing), packet redirection (masquerading), packet filtering, bandwidth administration (ALTQ), load balancing, and extra.

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Military and many government agencies have been doing this for many years, as have large financial institutions, corporations, and other organizations storing and processing sensitive information. With OpenBSD and pf(4), packet logging can be easily added to any of the firewall designs described earlier in this chapter. Apart from being able to perform packet filtering and redirection, pf(4) can be used as a packet logging and analysis station, either in conjunction with filtering and/or redirection or as a separate module.

First of all, forget the old ISA cards that you can buy a truckload for a dollar. They slow down the whole system and are not worth the trouble they cause. Always use PCI cards, and make sure that all cards you use work at 100Mbps. Older, 10Mbps cards can be used with 100Mbps equipment if it is marked 10/100Mpbs, but if you mix 10Mbps and 100Mbps cards on the same network segment you will slow down all devices on that segment to 10Mbps, unless you use a switch (some people use the name ‘bridge’) instead of a hub.

Also, it is well worth investing in cards that are faster than the networks you will be connecting your firewall to. So, if a network segment works at 10Mbps, use a 10/100Mpbs card, and if it works at 100Mbps, use a Gigabit Ethernet card. And yes, 10Gbps cards are in the works too. Whatever speed your Ethernet cards are working at, always use twisted pair cables for 10BASE-T, 100BASE-TX, or 1000BASE-T Ethernet (with RJ-45 plugs). Make sure that the cables you use are Category 5 (Cat 5) products.

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