iptables -t nat -vnL
Chain PREROUTING (policy ACCEPT 25619 packets, 1514K bytes)
 pkts bytes target     prot opt in     out     source               destination
  425 22636 DNAT       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:25565 to:yyy.yyy.yyy.yy

Chain INPUT (policy ACCEPT 24723 packets, 1454K bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 6617 packets, 485K bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain POSTROUTING (policy ACCEPT 7927 packets, 566K bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 SNAT       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp spt:25565 to:xxx.xxx.xxx.xxx
route -n


Směrovací tabulka v jádru pro IP
Adresát         Brána           Maska           Přízn Metrik Odkazů Užt Rozhraní
0.0.0.0         xxx.xxx.xxx.xx      0.0.0.0         UG    0      0        0 eth0
10.8.0.0        0.0.0.0         255.255.255.0   U     0      0        0 tun0
xxx.xxx.xxx.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0`
sysctl -a | grep net.ipv4.ip_forward
net.ipv4.ip_forward = 1
net.ipv4.ip_forward_use_pmtu = 0