R&M用VirtualBox安装好centOS后，将tomcat拷入，修改tomcat端口号为8092（也可以不修改，默认8080）。配置端口转发.
但是配置完端口转发后，用192.168.137.1:2205依然无法访问tomcat，尝试各种方式，无法解决！最后，发现是防火墙问题：
问题描述：
CentOS安装完成Tomcat后，访问本地：http://localhost:8080/正确。但局域网内无法访问
原因：
/etc/init.d/iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 RH-Firewall-1-INPUT all — 0.0.0.0/0 0.0.0.0/0
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 RH-Firewall-1-INPUT all — 0.0.0.0/0 0.0.0.0/0
Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
Chain RH-Firewall-1-INPUT (2 references)
num target prot opt source destination
1 ACCEPT all — 0.0.0.0/0 0.0.0.0/0
2 ACCEPT icmp — 0.0.0.0/0 0.0.0.0/0 icmp type 255
3 ACCEPT esp — 0.0.0.0/0 0.0.0.0/0
4 ACCEPT ah — 0.0.0.0/0 0.0.0.0/0
5 ACCEPT udp — 0.0.0.0/0 224.0.0.251 udp dpt:5353
6 ACCEPT udp — 0.0.0.0/0 0.0.0.0/0 udp dpt:631
7 ACCEPT tcp — 0.0.0.0/0 0.0.0.0/0 tcp dpt:631
8 ACCEPT all — 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
9 ACCEPT tcp — 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
10 REJECT all — 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
会得到一系列信息，说明防火墙开着。
解决：
/etc/init.d/iptables stop
Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: filter [ OK ]
Unloading iptables modules: [ OK ]
永久关闭:?chkconfig –level 35 iptables off
