iptables for vpn example

# Generated by iptables-save v1.4.4 on Sat May 28 13:29:42 2011
*mangle
:PREROUTING ACCEPT [712:62821]
:INPUT ACCEPT [712:62821]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [494:74058]
:POSTROUTING ACCEPT [494:74058]
COMMIT
# Completed on Sat May 28 13:29:42 2011
# Generated by iptables-save v1.4.4 on Sat May 28 13:29:42 2011
*filter
:INPUT ACCEPT [712:62821]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [494:74058]
COMMIT
# Completed on Sat May 28 13:29:42 2011
# Generated by iptables-save v1.4.4 on Sat May 28 13:29:42 2011
*nat
:PREROUTING ACCEPT [10:504]
:POSTROUTING ACCEPT [3:213]
:OUTPUT ACCEPT [3:213]
-A POSTROUTING -s 10.8.0.0/24 -j SNAT --to-source 123.456.789.123
COMMIT
# Completed on Sat May 28 13:29:42 2011