在RHEL5上安装了tomcat6, 启动之后，本机可以访问，但从其他机器访问不了，原来是iptables的问题。
1.环境：
vmware workstation 7.1.2 build-301548
Redhat Enterprise Linux 5.5
apache-tomcat-6.0.30
jdk1.6.0_22
2.问题描述：
在RHEL5上安装了tomcat6, 启动之后，本机可以访问，但从其他机器访问不了。
3.RHEL5安装后默认的ittables规则：
[root@localhost ~]# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination RH-Firewall-1-INPUT all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination RH-Firewall-1-INPUT all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain RH-Firewall-1-INPUT (2 references) target prot opt source destination ACCEPT all -- anywhere anywhere ACCEPT icmp -- anywhere anywhere icmp any ACCEPT esp -- anywhere anywhere ACCEPT ah -- anywhere anywhere ACCEPT udp -- anywhere 224.0.0.251 udp dpt:mdns ACCEPT udp -- anywhere anywhere udp dpt:ipp ACCEPT tcp -- anywhere anywhere tcp dpt:ipp ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh REJECT all -- anywhere anywhere reject-with icmp-host-prohibited
4.解决办法：
删除当前INPUT链上的规则
iptables -F INPUT
增加两条INPUT链上规则，针对tcp的80和8080端口(8080是tomcat的默认端口)
iptables -A INPUT -p tcp -s 0/0 --dport 80 -j ACCEPT
iptables -A INPUT -p tcp -s 0/0 --dport 8080 -j ACCEPT
5.关于iptables的配置参考：
iptables指南1.1.19
http://www.frozentux.net/iptables-tutorial/cn/iptables-tutorial-cn-1.1.19.html
如何使用netfilter/iptables构建防火墙
http://linux.ccidnet.com/art/737/20040317/96576_1.html
iptables简要应用说明
http://gotop.blog2.cnool.net/Article/2009/03/26/329994.html
centos iptables配置方法转
http://hi.baidu.com/tian%C2%BD%C0%DA/blog/item/e488ab12522eca8e6538db9d.html
iptables开放22 53 80端口
http://www.chengyongxu.com/blog/iptables%E5%BC%80%E6%94%BE225380%E7%AB%AF%E5%8F%A3/
