diff --git a/Shorewall2/changelog.txt b/Shorewall2/changelog.txt
index 9156197cd..c2fd56bdb 100644
--- a/Shorewall2/changelog.txt
+++ b/Shorewall2/changelog.txt
@@ -34,3 +34,5 @@ Changes since 1.4.10
     builtin actions dropBcast and dropNonSyn.
 
 17) Make "trace" a synonym for "debug"
+
+18) Add the ":noah" option to IPSEC tunnels.
diff --git a/Shorewall2/firewall b/Shorewall2/firewall
index 810e23392..9abbe294e 100755
--- a/Shorewall2/firewall
+++ b/Shorewall2/firewall
@@ -1115,15 +1115,29 @@ setup_tunnels() # $1 = name of tunnels file
 
     setup_one_ipsec() # $1 = gateway $2 = Tunnel Kind $3 = gateway zones
     {
+    	local kind=$2 noah=
+
+	case $kind in
+	    *:*)
+	    	noah=${kind#*:}
+		[ $noah = noah -o $noah = NOAH ] || fatal_error "Invalid IPSEC modifier $noah in tunnel \"$tunnel\""
+		kind=${kind%:*}
+		;;
+	esac
+
+	[ $kind = IPSEC ] && kind=ipsec
+
 	options="-m state --state NEW -j ACCEPT"
 	addrule $inchain	  -p 50	 -s $1 -j ACCEPT
 	addrule $outchain	  -p 50	 -d $1 -j ACCEPT
-	run_iptables -A $inchain  -p 51	 -s $1 -j ACCEPT
-	run_iptables -A $outchain -p 51	 -d $1 -j ACCEPT
+	if [ -z "$noah" ]; then
+	    run_iptables -A $inchain  -p 51	 -s $1 -j ACCEPT
+	    run_iptables -A $outchain -p 51	 -d $1 -j ACCEPT
+	fi
 
 	run_iptables -A $outchain -p udp -d $1 --dport 500 --sport 500 $options
 
-	if [ $2 = ipsec ]; then
+	if [ $kind = ipsec ]; then
 	    run_iptables -A $inchain  -p udp -s $1 --sport 500 --dport 500 $options
 	else
 	    run_iptables -A $inchain  -p udp -s $1 --dport 500 $options
@@ -1133,7 +1147,7 @@ setup_tunnels() # $1 = name of tunnels file
 	for z in $(separate_list $3); do
 	    if validate_zone $z; then
 		addrule ${FW}2${z} -p udp --sport 500 --dport 500 $options
-		if [ $2 = ipsec ]; then
+		if [ $kind = ipsec ]; then
 		    addrule ${z}2${FW} -p udp --sport 500 --dport 500 $options
 		else
 		    addrule ${z}2${FW} -p udp --dport 500 $options
@@ -1238,11 +1252,11 @@ setup_tunnels() # $1 = name of tunnels file
 	    inchain=${z}2${FW}
 	    outchain=${FW}2${z}
 	    case $kind in
-		ipsec|IPSEC)
-		    setup_one_ipsec $gateway ipsec $z1
+		ipsec|IPSEC|ipsec:*|IPSEC:*)
+		    setup_one_ipsec $gateway $kind $z1
 		    ;;
-		ipsecnat|IPSECNAT)
-		    setup_one_ipsec $gateway ipsecnat $z1
+		ipsecnat|IPSECNAT|ipsecnat:*|IPSECNAT:*)
+		    setup_one_ipsec $gateway $kind $z1
 		    ;;
 		ipip|IPIP)
 		    setup_one_other IPIP $gateway 4
diff --git a/Shorewall2/releasenotes.txt b/Shorewall2/releasenotes.txt
index 1bfe2d685..9b28ed2c6 100755
--- a/Shorewall2/releasenotes.txt
+++ b/Shorewall2/releasenotes.txt
@@ -161,5 +161,10 @@ New Features:
 
    The trace information would be written to the file /tmp/trace.
 
+6) When defining an ipsec tunnel in /etc/shorewall/tunnels, if you
+   follow the tunnel type ("ipsec" or "ipsecnet") with ":noah"
+   (e.g., "ipsec:noah"), then Shorewall will only create rules for
+   ESP (protocol 50) and will not create rules for AH (protocol 51).
+
 
  
diff --git a/Shorewall2/tunnels b/Shorewall2/tunnels
index 3123bbf63..2c032cb21 100644
--- a/Shorewall2/tunnels
+++ b/Shorewall2/tunnels
@@ -13,6 +13,10 @@
 #			"gre", "6to4", "pptpclient", "pptpserver", "openvpn" or 
 #			"generic"
 #
+#			If the type is "ipsec" or "ipsecnat", it may be followed
+#			by ":noah" to indicate that the Authentication Header
+#			protocol (51) is not used by the tunnel.
+#
 #			If type is "openvpn", it may optionally be followed
 #			by ":" and the port number used by the tunnel. if no
 #			":" and port number are included, then the default port
@@ -42,9 +46,10 @@
 #		Example 1:
 #
 #			IPSec tunnel. The remote gateway is 4.33.99.124 and
-#			the remote subnet is 192.168.9.0/24
+#			the remote subnet is 192.168.9.0/24. The tunnel does
+#			not use the AH protocol
 #
-#			ipsec	net	4.33.99.124
+#			ipsec:noah	net	4.33.99.124
 #
 #		Example 2:
 #