端口转发：

setting->network->

adapter:attached to NAT.

port forwarding rules->

name    protocol     host ip     host port   guest ip   guest port

rule1     tcp       127.0.0.1    20022       10.0.2.15      22

rule1     tcp      10.36.1.193   20022       10.0.2.15      22

iptables -I INPUT -p tcp -s 10.36.0.1/24 --dport 20022 -j ACCEPT

iptables -I INPUT -p tcp -s 10.36.1.0/24 --dport 20022 -j ACCEPT

iptables-save

iptables-save > /etc/sysconfig/iptables

ssh op@127.0.0.1 -p 20022