diff --git a/vpnsetup.sh b/vpnsetup.sh
index 384182c..5806711 100755
--- a/vpnsetup.sh
+++ b/vpnsetup.sh
@@ -343,8 +343,12 @@ cat > /etc/iptables.rules <<EOF
 -A INPUT -p udp --dport 1701 -j DROP
 -A INPUT -j DROP
 -A FORWARD -m conntrack --ctstate INVALID -j DROP
+# To disallow (DROP) traffic between VPN clients themselves, uncomment these lines:
+# -A FORWARD -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j DROP
+# -A FORWARD -s 192.168.43.0/24 -d 192.168.43.0/24 -j DROP
 -A FORWARD -i eth+ -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
 -A FORWARD -i ppp+ -o eth+ -j ACCEPT
+-A FORWARD -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j ACCEPT
 -A FORWARD -i eth+ -d 192.168.43.0/24 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
 -A FORWARD -s 192.168.43.0/24 -o eth+ -j ACCEPT
 -A FORWARD -j DROP
@@ -367,8 +371,12 @@ iptables -I INPUT 3 -p udp --dport 1701 -j DROP
 iptables -I FORWARD 1 -m conntrack --ctstate INVALID -j DROP
 iptables -I FORWARD 2 -i eth+ -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
 iptables -I FORWARD 3 -i ppp+ -o eth+ -j ACCEPT
-iptables -I FORWARD 4 -i eth+ -d 192.168.43.0/24 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-iptables -I FORWARD 5 -s 192.168.43.0/24 -o eth+ -j ACCEPT
+iptables -I FORWARD 4 -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j ACCEPT
+iptables -I FORWARD 5 -i eth+ -d 192.168.43.0/24 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+iptables -I FORWARD 6 -s 192.168.43.0/24 -o eth+ -j ACCEPT
+# To disallow (DROP) traffic between VPN clients themselves, uncomment these lines:
+# iptables -I FORWARD 2 -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j DROP
+# iptables -I FORWARD 3 -s 192.168.43.0/24 -d 192.168.43.0/24 -j DROP
 iptables -t nat -I POSTROUTING -s 192.168.43.0/24 -o eth+ -m policy --dir out --pol none -j SNAT --to-source "$PRIVATE_IP"
 iptables -t nat -I POSTROUTING -s 192.168.42.0/24 -o eth+ -j SNAT --to-source "$PRIVATE_IP"
 
diff --git a/vpnsetup_centos.sh b/vpnsetup_centos.sh
index 21e5e30..cb9e213 100755
--- a/vpnsetup_centos.sh
+++ b/vpnsetup_centos.sh
@@ -353,8 +353,12 @@ cat > /etc/sysconfig/iptables <<EOF
 -A INPUT -p udp --dport 1701 -j DROP
 -A INPUT -j DROP
 -A FORWARD -m conntrack --ctstate INVALID -j DROP
+# To disallow (DROP) traffic between VPN clients themselves, uncomment these lines:
+# -A FORWARD -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j DROP
+# -A FORWARD -s 192.168.43.0/24 -d 192.168.43.0/24 -j DROP
 -A FORWARD -i eth+ -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
 -A FORWARD -i ppp+ -o eth+ -j ACCEPT
+-A FORWARD -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j ACCEPT
 -A FORWARD -i eth+ -d 192.168.43.0/24 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
 -A FORWARD -s 192.168.43.0/24 -o eth+ -j ACCEPT
 -A FORWARD -j DROP
@@ -376,8 +380,12 @@ iptables -I INPUT 3 -p udp --dport 1701 -j DROP
 iptables -I FORWARD 1 -m conntrack --ctstate INVALID -j DROP
 iptables -I FORWARD 2 -i eth+ -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
 iptables -I FORWARD 3 -i ppp+ -o eth+ -j ACCEPT
-iptables -I FORWARD 4 -i eth+ -d 192.168.43.0/24 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-iptables -I FORWARD 5 -s 192.168.43.0/24 -o eth+ -j ACCEPT
+iptables -I FORWARD 4 -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j ACCEPT
+iptables -I FORWARD 5 -i eth+ -d 192.168.43.0/24 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+iptables -I FORWARD 6 -s 192.168.43.0/24 -o eth+ -j ACCEPT
+# To disallow (DROP) traffic between VPN clients themselves, uncomment these lines:
+# iptables -I FORWARD 2 -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j DROP
+# iptables -I FORWARD 3 -s 192.168.43.0/24 -d 192.168.43.0/24 -j DROP
 iptables -t nat -I POSTROUTING -s 192.168.43.0/24 -o eth+ -m policy --dir out --pol none -j SNAT --to-source "$PRIVATE_IP"
 iptables -t nat -I POSTROUTING -s 192.168.42.0/24 -o eth+ -j SNAT --to-source "$PRIVATE_IP"