在Ubuntu 12.04上查看NAT连接记录

aptitude -y install netstat-nat

Login as root user and type the following to display list of all natted connections:
# netstat-nat -n

To display NAT connections with protocol selection, enter:
# netstat-nat -n -p tcp

To display all connection by source IP called 192.168.1.100

# netstat-nat -s 192.168.1.100

To  display all connections by destination IP/hostname called laptop, enter:

# netstat-nat -s laptop

To  display SNAT connections, enter:

# netstat-nat -S

To   display DNAT connections, enter:

# netstat-nat -D

To display only connections to NAT box self i.e. doesn’t show SNAT & DNAT, enter:

# netstat-nat -L

To display help, enter:
$ netstat-nat -h
$ man netstat-nat