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IPFilter -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-11-06) IPFilter or commonly referred as ipf is a software package that can be used to provide (additional info and facts about network address translation) network address translation (NAT) or (The application of maximum thrust) firewall services. It can either be used as a loadable kernel module or incorporated into the (Trademark for a powerful operating system) UNIX (The choicest or most essential or most vital part of some idea or experience) kernel; use as a loadable kernel module where possible is highly recommended. IPFilter comes as a part of (additional info and facts about FreeBSD) FreeBSD, (additional info and facts about NetBSD) NetBSD and xMach. www.absoluteastronomy.com /encyclopedia/i/ip/ipfilter2.htm   (285 words)

IPFILTER   (Site not responding. Last check: 2007-11-06) Ipfilter provides NAT (which allows machines on an internal lan to access the outside world through your SCO server) and a packet filtering firewall capability (which prevents the big bad outside world from doing damage to your inside machines). Ipfilter is a packet filtering firewall- it examines each incoming or outgoing packet, checks that packet against a list of rules, and then either lets it continue wherever it was going or stops it. Ipfilter does have some tricks to make this sort of configuration easier, though, and as it turns out, you can actually do it both ways. aplawrence.com /Security/ipfilter.html   (1603 words)

BSD License???? At one point someone was interested in porting IPFilter to Linux, and it was working in late versions of Linux kernel 1.3 and early 2.0 back when Linux firewall code was weak. Now that Netfilter is superior in both features and flexibity to IPFilter (aside from the butt ugly and confusing configuration syntax), even if IPF were to suddenly become GPL licensed, Linux developers would have little reason to duplicate effort in an IPFilter port. IPfilter is pretty simple to use and very straightforward and PF is suposed to use the exact same syntax. lists.hosef.org /pipermail/luau/2001-September/004568.html   (635 words)

EnderUNIX Software Development Team IPFILTER is an open source application and has been ported to FreeBSD, NetBSD, OpenBSD, Sun, HP, and Solaris operating systems. IPFILTER is actively being supported and maintained, with updated versions being released regularly. IPFILTER also has user-land front-end interactive interfaces for controlling the firewall rules, NAT, packet accounting, and the logging facility. www.enderunix.org /docs/en/freebsd54/06.01-IPFILTER_IPF_Firewall.htm   (1185 words)

ipfilter on GNU/Linux: Is It Finally Here? | Linux Journal Because I was testing ipfilter using a handful of computers, I chose to proceed with the defaults in both files. In this case, I'm telling ipfilter to rewrite all connections from the 192.168.1.0/24 network so that they appear to be from 172.19.3.3 if the packets are go to out eth0. The really nice benefit of using iptables over ipfilter is that there is a lot more third party stuff written for iptables than ipfilter (and those are just the open source stuff). www.linuxjournal.com /article.php?sid=7595   (2601 words)

IPFilter/9000 Sizing and Performance White Paper IPFilter performs packet filtering by reading the header of an IP packet and comparing it to a set of user configured rules. Because IPFilter only reads the IP header, the size of an IP packet does not affect the speed at which IPFilter processes the packet. Therefore the impact of IPFilter on a slower interface is minimal because there aren`t many packets for it to check. docs.hp.com /en/1974/ipfil_sp.html   (814 words)

Learning Solaris 10 » Enabling IPFilter on Solaris 10   (Site not responding. Last check: 2007-11-06) From release 4.0, IPFilter is using a STREAMS module to hook itself into the Solaris stack. The difficulty is that for the “pfil” driver to be able to hook properly into the network stack, it must be present the first time a device of a certain type is opened, which basically comes down to interface plumbing time. Note that the same script will also start IPFilter with a very restrictive set of rules to cover the window of vulnerability during the time network is initialized and the “ipfilter” service is started. learningsolaris.com /archives/2005/05/19/ipfilter-on-solaris-10-primer   (668 words)

Daemon News '200211' : '"Filtering Bridge with IP Filter on FreeBSD "' As you probably know, ipfilter has support for stateful firewalling and NATing, so my first choice was to just use one external IP address, give all the machines an IP address in a private range (10.0.0.x or so), NAT and filter everything and I'd be done in under an hour. Their reason was that if someone on the Internet was hacked from a machine in our lab and we would have NATed the whole lab, it would be a lot harder to find out from which machine that person was actually hacked. I kept the ipfilter rules in /etc/ipf.rules, so this was the only change I had to make. ezine.daemonnews.org /200211/ipfilter-bridge.html   (1198 words)

BSD Guides :: Doing Stuff With FreeBSD, NetBSD, OpenBSD, & Mac OS X There are several options that you must insert into your /etc/rc.conf to tell your system at boot time to enable itself to route packets between interfaces, to load the ipnat and ipfilter software you compiled into your kernel, and where to find the rules for ipfilter and ipnat. Without the quick keyword, IPFILTER will continue to compare the packet against the remaining rules, with the last one matching being the one that counts. IPFILTER Howto - By Brendan Conoboy and Erik Fichtner www.bsdguides.org /guides/freebsd/networking/ipfilter.php   (1646 words)

SGI - Products: Software: SGI IPFilter   (Site not responding. Last check: 2007-11-06) IPFilter manages the state of the connections, configurations, and filters inbound and outbound IP packets by IP address, port number, interface, and other criteria including redirection of packets. IPFilter supports Network Address Translation (NAT), which allows many IP addresses to appear as one address on the external interface. SGI IPFilter 3.4.27 is derived from the public domain IPF 3.4.27 by Darren Reed. www.sgi.com /products/software/ipfilter.html   (244 words)

Computer Evidence - IPFILTER Guidelines IPFILTER is a DOS-BASED computer forensic tool created primarily to help law enforcement agencies in the investigation of case involving the distribution of child pornography. The IPFILTER program is well documented and a detailed instruction manual is provided with each copy of the program. Therefore, in critical cases, we strongly suggest that IPFILTER be used to process a file created from all file slack on the subject hard disk drive(s). www.secure-data.com /ip-guide.html   (1236 words)

Yukun Zhang(张玉昆)@Sun Microsystems   (Site not responding. Last check: 2007-11-06) IPFilter is the default firewall instead of the previous SunScreen, However, it is IPFilter 是 Solaris 10 自带的防火墙。在 Solaris 10 上IPFilter 的 IPFilter is very close to finish IPv6 support in Solaris10. blog.sun.com /roller/page/yukun?catname=/IPFilter   (274 words)

Open-source spat spurs software change | CNET News.com IPFilter is firewall software that accepts or rejects different types of network traffic based on the Internet Protocol address of packets of information sent over a network. The earlier IPFilter license said, "Redistribution and use in source and binary forms are permitted provided that this notice is preserved and due credit is given to the original author and the contributors," to which Reed added, "Yes, this means that derivative or modified works are not permitted without the author's prior consent." Asked on the IPFilter mailing list what would happen to IPFilter if Reed were hit by a bus, he responded, "I won't care. news.com.com /2100-1001-266399.html?legacy=cnet   (1032 words)

OpenBSD drops firewall program in licensing dispute But last month, Darren Reed, the Australia-based author of IPFilter, clarified the licensing language for his program to ensure that anyone wanting to make changes to the software could only do so with his prior approval. The matter may not stop there: De Raadt said an audit conducted after the IPFilter matter came to his attention revealed licensing issues with about five other programs that are also now being addressed. According to Crittenden, the IPFIlter listserve is now abuzz with comments from other developers who hadn't noticed that the firewall wasn't as open as they'd thought. www.networkworld.com /news/2001/0601bsd1.html   (658 words)

IPFilter TTL Fingerprinting Vulnerability - Xatrix Security IPFilter is a freely available, open source firewall package written by Darren Reed. When an attempt is made to connect to a system via TCP on a port that is filtered by IPFilter, and IPFilter returns a RST, it is possible to differentiate between filtered and unfiltered ports. A port that is filtered by IPFilter will return a RST with a TTL field set to 60, whereas the operating system will return it's default TTL value for a RST. www.xatrix.org /news1334.html   (159 words)

The FreeBSD Diary -- IP Filter - an alternative firewall and NAT to ipfw/natd   (Site not responding. Last check: 2007-11-06) So the above command tells ipfilter to load your rules into the inactive list but first flushes any rules which were already there. But just in case you have, the next command tells ipfilter to swap the active/inactive lists again. This tip came to me from David S. Madole of Optimized Micro Devices back in April 1999 via the ipfilter mailing list, but that message is still in my mailbox. www.freebsddiary.org /ipfilter.php   (1543 words)

IP Filter - TCP/IP Firewall/NAT Software   (Site not responding. Last check: 2007-11-06) Send mail to majordomo@coombs.anu.edu.au with "subscribe ipfilter" in the body of the mail. IPFilter is a software package that can be used to provide network address translation (NAT) or firewall services. To use, it can either be used as a loadable kernel module or incorporated into your UNIX kernel; use as a loadable kernel module where possible is highly recommended. coombs.anu.edu.au /~avalon   (754 words)

OpenBSD drops firewall program in licensing dispute - Computerworld For the past five years, OpenBSD has included a firewall application called IPFilter 3.4 that tracks all information packets traveling in and out of network servers running the operating system. On his e-mail listserv on the Internet, Reed wrote that IPFilter had always had a restrictive license and that was merely making that fact more clear. According to Chittenden, the IPFilter listserve is now abuzz with comments from other developers who hadn't noticed that the firewall isn't as open as they'd thought. www.computerworld.com /printthis/2001/0,4814,61038,00.html   (603 words)

IPFilter - Click documentation This large IPFilter implements the incoming packet filtering rules for the "Interior router" described on pp691-692 of Building Internet Firewalls, Second Edition (Elizabeth D. Zwicky, Simon Cooper, and D. Brent Chapman, O’Reilly and Associates, 2000). Returns a human-readable definition of the program the IPFilter element is using to classify packets. At each step in the program, four bytes of packet data are ANDed with a mask and compared against four bytes of classifier pattern. www.pdos.lcs.mit.edu /click/doc/IPFilter.n.html   (254 words)

FlowPoint FAQs: IP Filtering Tutorial Note: The accept rules should always be entered using the "insert" command to place them at the top of the list, and the drop rules should be entered using the "append" command to place them at the end of the filter list. To do this simply execute the following command, "remote ipfilter watch onoff " Again the remote name is "internet" by default. Notice that the count indicators (-c) have incremented for the two accept rules in both the input and output filter list, but the drop rules did not. support.efficient.com /KB/FP/ipfilter.html   (1694 words)

Practical Firewall Construction with IPFilter It is excluded from the default installation of the official OpenBSD 3.0 due to its license change, but a customly built OpenBSD with ipfilter as part of it is available at http://openbsd30.ipfilter.org. One of the most appreciating features of IPFilter is the distinct separation of filtering and forwarding functionality. For IPFilter, there are always two set of filtering rules: an active one and an inactive one. www.cas.mcmaster.ca /~wmfarmer/SE-4C03-02/projects/student_work/pangr.html   (3425 words)

Daemon News '200407' : '"IPFilter (IPF) Firewall "' IPFilter is a open source application and has been ported to FreeBSD, NetBSD, OpenBSD, Sun, HP, and Solaris operating systems. As of FreeBSD 4.9 which includes IPFilter version 3.4.31 the FTP proxy works as documented during the FTP session until the session is told to close. When the close happens packets returning from the remote FTP server are blocked and logged coming in on port 21. ezine.daemonnews.org /200407/ipfilter.html   (6446 words)

eMule-MoDs.de - IPFilter v94 #>> Statistics of IPFilter v94: Merged Ranges: 14766, Deny IP Count: 3 189 491 681 (74,3% of IPv4). #>> Statistics of IPFilter v93: Merged Ranges: 14735, Deny IP Count: 3 191 162 032 (74,3% of IPv4). #>> Statistics of IPFilter v92: Merged Ranges: 14681, Deny IP Count: 3 209 633 417 (74,7% of IPv4). www.emule-mods.de /?mods=ipfilter&page=1   (1736 words)

LWN: ipfilter on GNU/Linux: Is It Finally Here? (Linux Journal) Now, with the release of ipfilter 4.1.1, GNU/Linux is moving into the fold as a supported platform. Ironically, OpenBSD stopped using ipfilter a couple releases ago because of license difficulties or some other such kind of thing. which by the way is far better than ipfilter. lwn.net /Articles/87211   (544 words)

SecurityTracker.com Archives - (Vendor Responds) Re: IP Filter Packet State Error May Let Remote Users Deny Service There's an email address posted on IPFilter's web page, along with in the distribution that you could of (and did not) send email to about this. This is not an IPFilter problem, per se, but a known limitation of using any limited resource to allocate state table sessions and is not anything new to me (at least). Presently, in order to combat this, IPFilter will goto more effort to free up state table entries if it detects the table is full. www.securitytracker.com /alerts/2003/Jan/1005895.html   (558 words)

WallFire: wflogs - the firewall log analyzer of the WallFire project - Hervé Eychenne produces a report about ipfilter logfile in natural language on stdout, displaying packet length (datalen option) which is not showed by default. Please note that input modules are available on any architecture on which wflogs can run (for example, you can perfectly parse Cisco PIX logs on a Linux box). IPFilter: the excellent packet filter issued from *BSD systems (well... www.wallfire.org /wflogs   (1055 words)

AusCERT - ESB-2001.165 -- FreeBSD-SA-01:32.ipfilter [REVISED] -- IPFilter may incorrectly pass packets If you have not enabled IPFilter, your system is not vulnerable to this problem. Workaround Since fragment cache matching occurs before filtering rules checking, it is not possible to work around this problem using IPFilter rules. Solution [FreeBSD 3.x] Due to the age of the IPFilter package shipped with FreeBSD 3.x, it is recommended that FreeBSD 3.x systems update to IPFilter 3.4.17 using the package available from the authors website: http://coombs.anu.edu.au/~avalon/ip-filter.html [FreeBSD 4.x] One of the following: 1) Upgrade to FreeBSD 4.2-STABLE after the correction date. www.auscert.org.au /render.html?it=1275   (537 words)

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