add gateway script

gw.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+. driglibash-base
+
+if [ "$#" -ne 2 ] ; then
+    yell "Missing 2 parameters"
+    die "Usage: $0 <local_iface> <net_iface>"
+fi
+
+root_or_die
+
+local_iface="$1"
+net_iface="$2"
+
+run sysctl net.ipv4.ip_forward=1
+clean "sysctl net.ipv4.ip_forward=1"
+
+run nmcli device set "$local_iface" managed no
+clean "nmcli device set "$local_iface" managed yes"
+
+run ip a add 192.168.238.254/24 dev "$local_iface"
+clean "ip a del 192.168.238.254/24 dev $local_iface"
+
+# For dhcp offers
+run iptables -A OUTPUT -d 255.255.255.255/32 -j ACCEPT
+
+run iptables -A OUTPUT -d 192.168.238.0/24 -j ACCEPT
+run iptables -A INPUT  -s 192.168.238.0/24 -j ACCEPT
+run iptables -A INPUT  -s 255.255.255.255 -j ACCEPT
+run iptables -A INPUT  -i "$local_iface" -j ACCEPT
+
+run iptables -t nat -A POSTROUTING -o "$net_iface" -j MASQUERADE
+run iptables -A FORWARD -i $net_iface -o $local_iface -m state --state RELATED,ESTABLISHED -j ACCEPT
+run iptables -A FORWARD -i $local_iface -o $net_iface  -j ACCEPT
+run dnsmasq --dhcp-range=192.168.238.100,192.168.238.199,10m -d --server=9.9.9.9
+
+clean