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-rw-r--r--src/etc/sysctl.d/30-vyos-router.conf6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/etc/sysctl.d/30-vyos-router.conf b/src/etc/sysctl.d/30-vyos-router.conf
index e03d3a29c..4feb7e09a 100644
--- a/src/etc/sysctl.d/30-vyos-router.conf
+++ b/src/etc/sysctl.d/30-vyos-router.conf
@@ -27,6 +27,12 @@ net.ipv4.conf.all.arp_announce=2
# Enable packet forwarding for IPv4
net.ipv4.ip_forward=1
+# Enable directed broadcast forwarding feature described in rfc1812#section-5.3.5.2 and rfc2644.
+# Note that setting the 'all' entry to 1 doesn't enable directed broadcast forwarding on all interfaces.
+# To enable directed broadcast forwarding on an interface, both the 'all' entry and the input interface entry should be set to 1.
+net.ipv4.conf.all.bc_forwarding=1
+net.ipv4.conf.default.bc_forwarding=0
+
# if a primary address is removed from an interface promote the
# secondary address if available
net.ipv4.conf.all.promote_secondaries=1