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The strict mode, as specified in RFC 3704, section 2.2, causes packets to be dropped by the kernel if they arrive with a source IP address that is not expected on the interface they arrived in. This prevents internal spoofing attacks, and is considered best practice among the industry. After a discussion with Michael, we reached the conclusion that permitting users to configure the operating mode of RPF in IPFire causes more harm than good. The scenarios where strict RPF is not usable are negligible, and the vast majority of IPFire's userbase won't even notice a difference. This supersedes <495b4ca2-5a4b-2ffa-8306-38f152889582@ipfire.org>. Suggested-by: Michael Tremer <michael.tremer@ipfire.org> Signed-off-by: Peter Müller <peter.mueller@ipfire.org> Reviewed-by: Adolf Belka <adolf.belka@ipfire.org>
IPFire 2.x - The Open Source Firewall
What is IPFire?
IPFire is a hardened, versatile, state-of-the-art Open Source firewall based on Linux. Its ease of use, high performance in any scenario and extensibility make it usable for everyone. For a full list of features have a look here.
This repository contains the source code of IPFire 2.x which is used to build the whole distribution from scratch, since IPFire is not based on any other distribution.
Where can I get IPFire?
Just head over to https://www.ipfire.org/download
How do I use this software?
We have a long and detailed wiki located here which should answers most of your questions.
But I have some questions left. Where can I get support?
You can ask your question at our community located here. A complete list of our support channels can be found here.
How can I contribute?
We have another document for this. Please look here.