Linux网络相关
Linux网络相关
ifconfig -a 这个 -a 选项是如果在网卡down掉或者没有IP的时候不加选项是看不到的
[root@localhost ~]# ifconfig
ens33: flags=4163 mtu 1500
inet 172.16.79.140 netmask 255.255.255.0 broadcast 172.16.79.255
inet6 fe80::20c:29ff:fe45:ec93 prefixlen 64 scopeid 0x20
ether 00:0c:29:45:ec:93 txqueuelen 1000 (Ethernet)
RX packets 259340 bytes 221385363 (211.1 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 171931 bytes 35881931 (34.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1 (Local Loopback)
RX packets 64 bytes 5568 (5.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 64 bytes 5568 (5.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@localhost ~]# ip add
1: lo: mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:45:ec:93 brd ff:ff:ff:ff:ff:ff
inet 172.16.79.140/24 brd 172.16.79.255 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe45:ec93/64 scope link
valid_lft forever preferred_lft forever
关闭网卡和开启网卡
[root@localhost ~]# ifdown ens33
[root@localhost ~]# ifup ens33
[root@localhost ~]# ifdown ens33 && ifup ens33
设置虚拟网卡
配置文件可以删除网关和DNS
同时需要更改ip
更改后重启网卡会发现我们设置的ens33:0虚拟网卡
[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# cp ifcfg-ens33 ifcfg-ens33\:0
[root@localhost network-scripts]# vim ifcfg-ens33\:0
[root@localhost network-scripts]# cat ifcfg-ens33
ifcfg-ens33 ifcfg-ens33:0
[root@localhost network-scripts]# cat ifcfg-ens33\:0
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33:0
UUID=487e1678-0d20-449d-8ae6-b16c74b737b3
DEVICE=ens33:0
ONBOOT=yes
IPADDR=172.16.79.141
NETMASK=255.255.255.0
[root@localhost network-scripts]# ifdown ens33 && ifup ens33
Determining if ip address 172.16.79.141 is already in use for device ens33...
[root@localhost network-scripts]# ifconfig
ens33: flags=4163 mtu 1500
inet 172.16.79.140 netmask 255.255.255.0 broadcast 172.16.79.255
inet6 fe80::20c:29ff:fe45:ec93 prefixlen 64 scopeid 0x20
ether 00:0c:29:45:ec:93 txqueuelen 1000 (Ethernet)
RX packets 1071 bytes 94921 (92.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 647 bytes 77653 (75.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33:0: flags=4163 mtu 1500
inet 172.16.79.141 netmask 255.255.255.0 broadcast 172.16.79.255
ether 00:0c:29:45:ec:93 txqueuelen 1000 (Ethernet)
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@localhost ~]# ping 172.16.79.141
PING 172.16.79.141 (172.16.79.141) 56(84) bytes of data.
64 bytes from 172.16.79.141: icmp_seq=1 ttl=64 time=0.070 ms
64 bytes from 172.16.79.141: icmp_seq=2 ttl=64 time=0.053 ms
64 bytes from 172.16.79.141: icmp_seq=3 ttl=64 time=0.110 ms
64 bytes from 172.16.79.141: icmp_seq=4 ttl=64 time=0.054 ms
64 bytes from 172.16.79.141: icmp_seq=5 ttl=64 time=0.064 ms
^C
--- 172.16.79.141 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 3999ms
rtt min/avg/max/mdev = 0.053/0.070/0.110/0.021 ms
查看网卡是否连接
[root@localhost ~]# mii-tool ens33
ens33: negotiated 1000baseT-FD flow-control, link ok
[root@localhost ~]# ethtool ens33
Settings for ens33:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
MDI-X: off (auto)
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
更改主机名
[root@localhost ~]# hostnamectl set-hostname wsl-001
[root@localhost ~]# hostname
wsl-001
[root@localhost ~]# bash
[root@wsl-001 ~]# exit
exit
[root@localhost ~]# cat /etc/hostname
wsl-001
DNS配置文件
[root@localhost ~]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 119.29.29.29
search localdomain
[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-ens33
(增加DNS2=8.8.8.8)
[root@localhost ~]# ifdown ens33 && ifup ens33
Determining if ip address 172.16.79.141 is already in use for device ens33...
[root@localhost ~]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 119.29.29.29
nameserver 8.8.8.8
/etc/hosts文件
更改文件使访问域名跳转
支持一个ip配多个域名
同样的域名后面会覆盖前面的
[root@localhost ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
[root@localhost ~]# ping www.qq123.com
PING www.qq123.com (202.91.250.93) 56(84) bytes of data.
64 bytes from 202.91.250.93 (202.91.250.93): icmp_seq=1 ttl=128 time=32.5 ms
64 bytes from 202.91.250.93 (202.91.250.93): icmp_seq=2 ttl=128 time=31.3 ms
^C
--- www.qq123.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 31.315/31.934/32.553/0.619 ms
[root@localhost ~]# vim /etc/hosts
[root@localhost ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
172.16.79.140 www.qq123.com
[root@localhost ~]# ping www.qq123.com
PING www.qq123.com (172.16.79.140) 56(84) bytes of data.
64 bytes from www.qq123.com (172.16.79.140): icmp_seq=1 ttl=64 time=0.041 ms
64 bytes from www.qq123.com (172.16.79.140): icmp_seq=2 ttl=64 time=0.083 ms
64 bytes from www.qq123.com (172.16.79.140): icmp_seq=3 ttl=64 time=0.098 ms
64 bytes from www.qq123.com (172.16.79.140): icmp_seq=4 ttl=64 time=0.058 ms
^C
--- www.qq123.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3002ms
rtt min/avg/max/mdev = 0.041/0.070/0.098/0.022 ms
firewalld和netfilter
Linux防火墙-netfilter
selinux临时关闭
Permissive仅仅提醒
[root@localhost ~]# setenforce 0
[root@localhost ~]# getenforce
Permissive
selinux永久关闭
更改文件后重启系统生效
[root@localhost ~]# cat /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=enforcing
# SELINUXTYPE= can take one of three two values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
[root@localhost ~]# vim /etc/selinux/config
[root@localhost ~]# cat /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of three two values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
centos7之前版本使用netfilter防火墙
先关闭firewalld，然后停止firewalld服务
再安装iptables-services,启动iptables服务
[root@localhost ~]# systemctl disable firewalld
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# yum install -y iptables-services
[root@localhost ~]# systemctl enable iptables
Created symlink from /etc/systemd/system/basic.target.wants/iptables.service to /usr/lib/systemd/system/iptables.service.
[root@localhost ~]# systemctl start iptables
[root@localhost ~]# iptables -nvL （查看默认规则）
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
78 5524 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 41 packets, 3896 bytes)
pkts bytes target prot opt in out source destination
centos7版本开始使用firewalld防火墙
netfilter5表5链介绍
Linux防火墙-netfilter
netfilter的5个表
filter表主要用于过滤包，是系统预设表。该表内建3个链：INPUT、OUTPUT以及FORWARD。INPUT链作用于进入本机的包，OUTPUT链作用于本机送出的包，FORWARD链作用于那些跟本机无关的包。
nat表用于网络地址转换（IP映射）。PREOUTING链的作用是在包刚刚到达防火墙时改变它的目标地址，OUTPUT链的作用是改变本地产生的包的目的地址，POSTROUTING链的作用是在包即将离开防火墙时改变其源地址。
managle表用于给数据包做标记，几乎用不到
raw表可以实现不追踪某些数据包，几乎用不到
security表在centos6中并没有，用于强制访问控制（MAC）的网络规则，几乎用不到
iptables语法
Linux防火墙-netfilter
iptables规则查看
规则保存地址 /etc/sysconfig/iptables
[root@wsl-001 ~]# iptables -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
376 30957 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
2 140 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
1 64 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
1 96 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 361 packets, 32003 bytes)
pkts bytes target prot opt in out source destination
[root@wsl-001 ~]# cat /etc/sysconfig/iptables
# sample configuration for iptables service
# you can edit this manually or use system-config-firewall
# please do not ask us to add additional ports/services to this default configuration
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
iptables -F 清空规则
但是文件里面还是有规则，如果重启iptables或者重启服务器就会还原为文件中的规则
service iptables sava 保存当前的规则写入到文件中
[root@wsl-001 ~]# iptables -F
[root@wsl-001 ~]# iptables -nvL
Chain INPUT (policy ACCEPT 17 packets, 1180 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 9 packets, 864 bytes)
pkts bytes target prot opt in out source destination
[root@wsl-001 ~]# cat /etc/sysconfig/iptables
# sample configuration for iptables service
# you can edit this manually or use system-config-firewall
# please do not ask us to add additional ports/services to this default configuration
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
[root@wsl-001 ~]# service iptables restart
Redirecting to /bin/systemctl restart iptables.service
[root@wsl-001 ~]# iptables -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
9 636 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 5 packets, 656 bytes)
pkts bytes target prot opt in out source
查看指定表
iptables -t nat -nvL
如果不加 -t filter 则默认就是filter表
[root@wsl-001 ~]# iptables -t filter -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
97 6816 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 56 packets, 7104 bytes)
pkts bytes target prot opt in out source destination
iptables -Z 可以把计数器清零
[root@wsl-001 ~]# iptables -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
204 14821 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 167 packets, 16798 bytes)
pkts bytes target prot opt in out source destination
[root@wsl-001 ~]# iptables -Z;iptables -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
-A 增加协议 -s 来源IP -p 指定协议 --sport 来源端口 -d 目标IP --dport 目标端口 -j 操作 DROP(扔掉) REJECT(拒绝)
-I 是插入到最前面
优先过滤前面的规则
-D 删除规则
[root@wsl-001 ~]# iptables -A INPUT -s 192.168.188.1 -p tcp --sport 1234 -d 192.168.188.128 --dport 80 -j DROP
[root@wsl-001 ~]# iptables -t filter -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
309 22189 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
0 0 DROP tcp -- * * 192.168.188.1 192.168.188.128 tcp spt:1234 dpt:80
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 28 packets, 2456 bytes)
pkts bytes target prot opt in out source destination
[root@wsl-001 ~]# iptables -I INPUT -p tcp --dport 80 -j DROP
[root@wsl-001 ~]# iptables -t filter -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 DROP tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
580 42250 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
0 0 DROP tcp -- * * 192.168.188.1 192.168.188.128 tcp spt:1234 dpt:80
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 9 packets, 936 bytes)
pkts bytes target prot opt in out source destination
[root@wsl-001 ~]# iptables -D INPUT -p tcp --dport 80 -j DROP
[root@wsl-001 ~]# iptables -t filter -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
674 49122 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
0 0 DROP tcp -- * * 192.168.188.1 192.168.188.128 tcp spt:1234 dpt:80
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 4 packets, 544 bytes)
pkts bytes target prot opt in out source destination
[root@wsl-001 ~]# iptables -D INPUT -s 192.168.188.1 -p tcp --sport 1234 -d 192.168.188.128 --dport 80 -j DROP
[root@wsl-001 ~]# iptables -t filter -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
727 52938 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 4 packets, 640 bytes)
pkts bytes target prot opt in out source destination
另外一种删除方法
[root@wsl-001 ~]# iptables -A INPUT -s 192.168.188.1 -p tcp --sport 1234 -d 192.168.188.128 --dport 80 -j DROP
[root@wsl-001 ~]# iptables -nvL --line-number
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 827 60030 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
3 0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
4 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
5 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
6 0 0 DROP tcp -- * * 192.168.188.1 192.168.188.128 tcp spt:1234 dpt:80
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 31 packets, 2744 bytes)
num pkts bytes target prot opt in out source destination
[root@wsl-001 ~]# iptables -D INPUT 6
[root@wsl-001 ~]# iptables -nvL --line-number
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 1166 87287 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
3 0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
4 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
5 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 41 packets, 4544 bytes)
num pkts bytes target prot opt in out source destination
iptables -P INPUT DROP （默认规则进入的数据包全部丢掉）
这个保持默认就行了
扩展（selinux了解即可）
1. selinux教程 http://os.51cto.com/art/201209/355490.htm
2.selinux pdf电子书 http://pan.baidu.com/s/1jGGdExK