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