2019-05-206防火墙基础

安全技术

Tasklist"是 winxp/win2003/vista/win7/win8下的命令,用来显示运行在本地或远程计算机上的所有进程，带有多个执行参数。
C:\Users\Administrator> tasklist

[root@inotify yum.repos.d]# grep -i IPTABLES /boot/config-3.10.0-957.el7.x86_64    查看关于Linux的防火墙内核
CONFIG_IP_NF_IPTABLES=m
CONFIG_IP6_NF_IPTABLES=m
# iptables trigger is under Netfilter config (LED target)

5个钩子函数

[root@localhost ~]#iptables -nvL -t mangle    查看mangle几个链
Chain PREROUTING (policy ACCEPT 50810 packets, 32M bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain INPUT (policy ACCEPT 50790 packets, 32M bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 10732 packets, 753K bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain POSTROUTING (policy ACCEPT 10832 packets, 766K bytes)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 CHECKSUM   udp  --  *      virbr0  0.0.0.0/0            0.0.0.0/0            udp dpt:68 CHECKSUM fill

查看nat表几个链

查看raw几个链

查看filter表几个链，这个表过略用的