sysctl: Enable ping(8) inside rootless Podman containers

[thirdparty/systemd.git] / sysctl.d / 50-default.conf

diff --git a/sysctl.d/50-default.conf b/sysctl.d/50-default.conf
index 27084f62424bf2cf3407c7a1a6bcc6bed2aa15b9..f0b4f610f850a27af52544ff1d4cbdc368a90836 100644 (file)
--- a/sysctl.d/50-default.conf
+++ b/sysctl.d/50-default.conf
@@ -30,6 +30,14 @@ net.ipv4.conf.all.accept_source_route = 0
 # Promote secondary addresses when the primary address is removed
 net.ipv4.conf.all.promote_secondaries = 1
 
+# ping(8) without CAP_NET_ADMIN and CAP_NET_RAW
+# The upper limit is set to 2^31-1. Values greater than that get rejected by
+# the kernel because of this definition in linux/include/net/ping.h:
+#   #define GID_T_MAX (((gid_t)~0U) >> 1)
+# That's not so bad because values between 2^31 and 2^32-1 are reserved on
+# systemd-based systems anyway: https://systemd.io/UIDS-GIDS.html#summary
+net.ipv4.ping_group_range = 0 2147483647
+
 # Fair Queue CoDel packet scheduler to fight bufferbloat
 net.core.default_qdisc = fq_codel