From 045edcca2fd1bc2a338489f958e89b60b3065606 Mon Sep 17 00:00:00 2001
From: Bryan Boreham <bjboreham@gmail.com>
Date: Wed, 13 Apr 2016 12:05:24 +0100
Subject: [PATCH] Add iptables rule excluding multicast from NAT on 'weave
 expose'

---
 weave | 1 +
 1 file changed, 1 insertion(+)

diff --git a/weave b/weave
index 2513517e..3023f29f 100755
--- a/weave
+++ b/weave
@@ -2129,6 +2129,7 @@ EOF
             if ! ip addr show dev $BRIDGE | grep -qF $CIDR ; then
                 ip addr add dev $BRIDGE $CIDR
                 arp_update $BRIDGE $CIDR
+                add_iptables_rule nat WEAVE -s $CIDR -d 224.0.0.0/4 -j RETURN
                 add_iptables_rule nat WEAVE -d $CIDR ! -s $CIDR -j MASQUERADE
                 add_iptables_rule nat WEAVE -s $CIDR ! -d $CIDR -j MASQUERADE
             fi