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From 75c9af80cf3529c76988451e63f98010c86f48f1 Mon Sep 17 00:00:00 2001
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From: Lubomir Rintel <lkundrak@v3.sk>
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Date: Wed, 28 Nov 2018 11:44:20 +0100
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Subject: [PATCH] sysctl.d: switch net.ipv4.conf.all.rp_filter from 1 to 2
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This switches the RFC3704 Reverse Path filtering from Strict mode to Loose
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mode. The Strict mode breaks some pretty common and reasonable use cases,
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such as keeping connections via one default route alive after another one
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appears (e.g. plugging an Ethernet cable when connected via Wi-Fi).
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The strict filter also makes it impossible for NetworkManager to do
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connectivity check on a newly arriving default route (it starts with a
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higher metric and is bumped lower if there's connectivity).
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Kernel's default is 0 (no filter), but a Loose filter is good enough. The
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few use cases where a Strict mode could make sense can easily override
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this.
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The distributions that don't care about the client use cases and prefer a
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strict filter could just ship a custom configuration in
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/usr/lib/sysctl.d/ to override this.
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Cherry-picked from: 230450d4e4f1f5fc9fa4295ed9185eea5b6ea16e
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Resolves: #1653824
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---
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sysctl.d/50-default.conf | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/sysctl.d/50-default.conf b/sysctl.d/50-default.conf
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index e263cf0628..b0645f33e7 100644
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--- a/sysctl.d/50-default.conf
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+++ b/sysctl.d/50-default.conf
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@@ -22,7 +22,7 @@ kernel.sysrq = 16
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kernel.core_uses_pid = 1
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# Source route verification
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-net.ipv4.conf.all.rp_filter = 1
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+net.ipv4.conf.all.rp_filter = 2
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# Do not accept source routing
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net.ipv4.conf.all.accept_source_route = 0
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