iptables-save:
# Generated by iptables-save v1.4.14 on Wed Jul 27 12:15:49 2016
*nat
:PREROUTING ACCEPT [3987:281961]
:INPUT ACCEPT [3:152]
:OUTPUT ACCEPT [19:4222]
:POSTROUTING ACCEPT [41:6022]
:NAT_POSTROUTING_CHAIN - [0:0]
:NAT_PREROUTING_CHAIN - [0:0]
:POST_NAT_POSTROUTING_CHAIN - [0:0]
:POST_NAT_PREROUTING_CHAIN - [0:0]
-A PREROUTING -j NAT_PREROUTING_CHAIN
-A PREROUTING -j POST_NAT_PREROUTING_CHAIN
-A POSTROUTING -o eth0 -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
-A POSTROUTING -j NAT_POSTROUTING_CHAIN
-A POSTROUTING -s 172.16.0.0/24 ! -d 172.16.0.0/24 -o eth0