diff --git a/docs/MultiISP.xml b/docs/MultiISP.xml
index 5fe940cba..e799362e2 100644
--- a/docs/MultiISP.xml
+++ b/docs/MultiISP.xml
@@ -119,7 +119,7 @@
           ISP.</para>
         </footnote> as in the following diagram.</para>
 
-      <graphic align="center" fileref="images/TwoISPs.png" valign="middle" />
+      <graphic align="center" fileref="images/TwoISPs.png" valign="middle"/>
 
       <itemizedlist>
         <listitem>
@@ -342,6 +342,33 @@
             may try to use those stale files to determine the gateway
             address.</para>
 
+            <para>If Shorewall is unable to detect the gateway, it is likely
+            because you are using a DHCP client that Shorewall doesn't
+            natively support. You can work around that issue by using the
+            <emphasis role="bold">findgw</emphasis> <ulink
+            url="shorewall_extension_scripts.htm">extension
+            script.</ulink></para>
+
+            <para>For example, these examples from Mika Ilmaranta, work with
+            RHEL7-based systems with nmcli:</para>
+
+            <programlisting>nmcli --terse --fields IP6.GATEWAY device show ${1} | cut -f2- -d':' # IPv6
+
+nmcli --terse --fields IP4.GATEWAY device show ${1} | cut -f2- -d':' #IPv4
+</programlisting>
+
+            <para>This one from PGNd works on OpenSuSE running wicked:</para>
+
+            <programlisting>svc_status=$( systemctl is-active wickedd-dhcp4.service )
+
+if [ $svc_status == 'active' ]; then
+  data="/var/lib/wicked/lease-${1}-dhcp-ipv4.xml"
+  if [ -f $data ]; then
+    gateway=$( xml_grep 'gateway' $data --text_only )
+    echo $gateway
+  fi
+fi</programlisting>
+
             <para>The GATEWAY may be omitted (enter '-') for point-to-point
             links.</para>
           </listitem>
@@ -2480,7 +2507,7 @@ exit 0
       on ursa that I will describe here</emphasis>.</para>
 
       <para>Below is a diagram of our network:<graphic align="center"
-      fileref="images/Network2008a.png" /></para>
+      fileref="images/Network2008a.png"/></para>
 
       <para>The local wired network in my office is connected to both gateways
       and uses the private (RFC 1918) network 172.20.1.0/24. The Comcast
@@ -2651,7 +2678,7 @@ wlan0                   192.168.0.0/24</programlisting><note>
 
     <para>The network is pictured in the following diagram:</para>
 
-    <graphic fileref="images/Network2013.png" />
+    <graphic fileref="images/Network2013.png"/>
 
     <section>
       <title>IPv4 Configuration</title>