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By default, both SSH server and client rely on TCP-based keep alive messages to detect broken sessions, which can be spoofed rather easily in order to keep a broken session opened (and vice versa). Since we rely on SSH-based keep alive messages, which are not vulnerable to this kind of tampering, there is no need to double-check connections via TCP keep alive as well. This patch thereof disables using TCP keep alive for both SSH client and server scenario. For usability reasons, a timeout of 5 minutes (10 seconds * 30 keep alive messages = 300 seconds) will be used for both client and server configuration, as 60 seconds were found to be too short for unstable connectivity scenarios. Signed-off-by: Peter Müller <peter.mueller@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.