bookends, classify, local: Fixes for IP multicasting.

[firewall] / local.m4

diff --git a/local.m4 b/local.m4
index b9fa700..4123a77 100644 (file)
--- a/local.m4
+++ b/local.m4
@@ -51,6 +51,9 @@ defiface $if_trusted \
        safe:172.29.199.64/27 \
        untrusted:default
 
+## Default NTP servers.
+ntp_servers="158.152.1.76 158.152.1.204 194.159.253.2 195.173.57.232"
+
 m4_divert(60)m4_dnl
 ###--------------------------------------------------------------------------
 ### Special forwarding exemptions.
@@ -125,6 +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