diff --git a/Shorewall/Samples/one-interface/interfaces b/Shorewall/Samples/one-interface/interfaces
index c1e12a113..789388943 100644
--- a/Shorewall/Samples/one-interface/interfaces
+++ b/Shorewall/Samples/one-interface/interfaces
@@ -14,4 +14,4 @@
 FORMAT 2
 ###############################################################################
 #ZONE	INTERFACE	OPTIONS
-net     eth0            dhcp,tcpflags,logmartians,nosmurfs
+net     eth0            dhcp,tcpflags,logmartians,nosmurfs,sourceroute=0
diff --git a/Shorewall/Samples/three-interfaces/interfaces b/Shorewall/Samples/three-interfaces/interfaces
index d455a4c8b..fa9c35a59 100644
--- a/Shorewall/Samples/three-interfaces/interfaces
+++ b/Shorewall/Samples/three-interfaces/interfaces
@@ -14,6 +14,6 @@
 FORMAT 2
 ###############################################################################
 #ZONE	INTERFACE	OPTIONS
-net     eth0            tcpflags,dhcp,nosmurfs,routefilter,logmartians
+net     eth0            tcpflags,dhcp,nosmurfs,routefilter,logmartians,sourceroute=0
 loc     eth1            tcpflags,nosmurfs,routefilter,logmartians
 dmz     eth2            tcpflags,nosmurfs,routefilter,logmartians
diff --git a/Shorewall/Samples/two-interfaces/interfaces b/Shorewall/Samples/two-interfaces/interfaces
index 74e06cb6b..6df4ab365 100644
--- a/Shorewall/Samples/two-interfaces/interfaces
+++ b/Shorewall/Samples/two-interfaces/interfaces
@@ -14,5 +14,5 @@
 FORMAT 2
 ###############################################################################
 #ZONE	INTERFACE	OPTIONS
-net     eth0            dhcp,tcpflags,nosmurfs,routefilter,logmartians
+net     eth0            dhcp,tcpflags,nosmurfs,routefilter,logmartians,sourceroute=0
 loc     eth1            tcpflags,nosmurfs,routefilter,logmartians
diff --git a/Shorewall6/Samples6/Universal/interfaces b/Shorewall6/Samples6/Universal/interfaces
index 71be605e6..b86de5541 100644
--- a/Shorewall6/Samples6/Universal/interfaces
+++ b/Shorewall6/Samples6/Universal/interfaces
@@ -11,5 +11,5 @@ FORMAT 2
 ###############################################################################
 #ZONE	INTERFACE	OPTIONS
 -	lo		ignore
-net	all		dhcp,physical=+,routeback
+net	all		dhcp,physical=+,routeback,sourceroute=0
 
diff --git a/Shorewall6/Samples6/three-interfaces/interfaces b/Shorewall6/Samples6/three-interfaces/interfaces
index 393c544ed..a3499651d 100644
--- a/Shorewall6/Samples6/three-interfaces/interfaces
+++ b/Shorewall6/Samples6/three-interfaces/interfaces
@@ -14,6 +14,6 @@
 FORMAT 2
 ###############################################################################
 #ZONE	INTERFACE	OPTIONS
-net     eth0            tcpflags,forward=1
+net     eth0            tcpflags,forward=1,sourceroute=0
 loc     eth1            tcpflags,forward=1
 dmz     eth2            tcpflags,forward=1
diff --git a/Shorewall6/Samples6/two-interfaces/interfaces b/Shorewall6/Samples6/two-interfaces/interfaces
index f3a75582c..c15c0a4ee 100644
--- a/Shorewall6/Samples6/two-interfaces/interfaces
+++ b/Shorewall6/Samples6/two-interfaces/interfaces
@@ -14,5 +14,5 @@
 FORMAT 2
 ###############################################################################
 #ZONE	INTERFACE	OPTIONS
-net     eth0            tcpflags,forward=1
+net     eth0            tcpflags,forward=1,sourceroute=0
 loc     eth1            tcpflags,forward=1