iptables -t nat -vnL

[root@vpnsquid ~]# iptables -t nat -vnL
Chain PREROUTING (policy ACCEPT 1128 packets, 64046 bytes)
 pkts bytes target     prot opt in     out     source               destination
    4   240 REDIRECT   tcp  --  tun1   *       172.8.0.0/24         0.0.0.0/0           tcp dpt:80 redir ports 3128
    0     0 REDIRECT   tcp  --  tun1   *       172.8.0.0/24         0.0.0.0/0           tcp spt:80 redir ports 3128

Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 MASQUERADE  all  --  *      eth0    172.8.0.0/24         0.0.0.0/0
    0     0 MASQUERADE  all  --  *      tun1    172.8.0.0/24         0.0.0.0/0
    1   145 MASQUERADE  all  --  *      eth0    0.0.0.0/0            0.0.0.0/0
    9   664 MASQUERADE  all  --  *      tun+    0.0.0.0/0            0.0.0.0/0

Chain OUTPUT (policy ACCEPT 15 packets, 3663 bytes)
 pkts bytes target     prot opt in     out     source               destination
[root@vpnsquid ~]#