bookends, classify, local: Fixes for IP multicasting.

[firewall] / local.m4

diff --git a/local.m4 b/local.m4
index 0d67a97..4123a77 100644 (file)
--- a/local.m4
+++ b/local.m4
@@ -128,6 +128,13 @@ run iptables -A inbound -j ACCEPT \
        -s 172.29.198.0/23 \
        -p udp --source-port $port_bootpc --destination-port $port_bootps
 
+## Incoming broadcast multicast on a network interface associated with the
+## trusted network is OK, since it must have originated there (or been
+## forwarded, but we don't do that yet).
+run iptables -A inbound -j ACCEPT \
+       -s 0.0.0.0 -d 224.0.0.0/24 \
+       -i $if_trusted
+
 ## Allow incoming ping.  This is the only ICMP left.
 run ip46tables -A inbound -j ACCEPT -p icmp