diff --git a/iptables.init b/iptables.init
index bdfa5e2..d808f03 100755
--- a/iptables.init
+++ b/iptables.init
@@ -28,6 +28,11 @@ if lsmod 2>/dev/null | grep -q ipchains ; then
     exit 0
 fi
 
+# no protocol support, don't try to run
+if [ ! -d /proc/sys/net/ipv4 ]; then
+    exit 0
+fi    
+
 # Old or new modutils
 /sbin/modprobe --version 2>&1 | grep -q module-init-tools \
     && NEW_MODUTILS=1 \
diff --git a/iptables.spec b/iptables.spec
index 0c300b6..0ccb17b 100644
--- a/iptables.spec
+++ b/iptables.spec
@@ -3,7 +3,7 @@
 Name: iptables
 Summary: Tools for managing Linux kernel packet filtering capabilities.
 Version: 1.3.7
-Release: 1.1
+Release: 2
 Source: http://www.netfilter.org/%{name}-%{version}.tar.bz2
 Source1: iptables.init
 Source2: iptables-config
@@ -95,7 +95,7 @@ cp ip{6,}tables-{save,restore} $RPM_BUILD_ROOT/sbin
 cp iptables-*.8 $RPM_BUILD_ROOT%{_mandir}/man8
 mkdir -p $RPM_BUILD_ROOT/etc/rc.d/init.d
 install -c -m755 %{SOURCE1} $RPM_BUILD_ROOT/etc/rc.d/init.d/iptables
-sed -e 's;iptables;ip6tables;g' -e 's;IPTABLES;IP6TABLES;g' < %{SOURCE1} > ip6tables.init
+sed -e 's;iptables;ip6tables;g' -e 's;IPTABLES;IP6TABLES;g' -e 's;/proc/sys/net/ipv4;/proc/sys/net/ipv6;g' < %{SOURCE1} > ip6tables.init
 install -c -m755 ip6tables.init $RPM_BUILD_ROOT/etc/rc.d/init.d/ip6tables
 mkdir -p $RPM_BUILD_ROOT/etc/sysconfig
 install -c -m755 %{SOURCE2} $RPM_BUILD_ROOT/etc/sysconfig/iptables-config
@@ -153,6 +153,9 @@ fi
 %endif
 
 %changelog
+* Mon Apr 23 2007 Jeremy Katz <katzj@redhat.com> - 1.3.7-2
+- fix error when ipv6 support isn't loaded in the kernel (#236888)
+
 * Wed Jan 10 2007 Thomas Woerner <twoerner@redhat.com> 1.3.7-1.1
 - fixed installation of secmark modules