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I am running vpn servers, but some customers using vpn sending spams so I want to log all ip forward information into a log file

eg: x.x.x.x(public IP)--->forward 10.0.0.x(vpn privated IP)

if there is a complaint for spam sending , I will check which user was using the privated IP address at that time and can quickly find out who was abusing VPN

my question is : is there any way to log all ip forward information

great thanks

=====add===

my purpose is : logging all the source ip of inbound traffic and the next hop ip address

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you should mention what VPN software you are using – stew May 25 '12 at 2:57
openvpn and pptp – cosbeta May 25 '12 at 3:17
please advise what forward rules for VPN you have in iptables? – alexm May 25 '12 at 3:52
tcpdump -i tun4 ip >ipincoming.log tun4 is my openvpn tun so this is resolved – cosbeta May 25 '12 at 6:00

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