The ifconfig command is used to view network related commands:
Installation: yum install net-tools -y
ifdown eth_name shuts down the network card
ifup eth_name enable network card
Configure the virtual network card:
Edited content:
DEVICE=bond:1
BONDING_OPTS="updelay=0 resend_igmp=1 use_carrier=1 miimon=100 arp_all_targets=any min_links=0 downdelay=0 xmit_hash_policy=layer2 primary_reselect=always fail_over_mac=none arp_validate=none mode=active-backup lp_interval=1 primary=ens33 all_slaves_active=0 arp_interval=0 ad_select=stable num_unsol_na=1 num_grat_arp=1"
TYPE=Bond
BONDING_MASTER=yes
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
IPADDR=192.168.6.111
PREFIX=24
GATEWAY=192.168.6.10
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=bond
UUID=cd9a0d91-8ec9-41fb-bf2d-c83b7dc0ddd8
ONBOOT=yes
Check the network connection status:
mii-tool eth_name
ethtool eth_name
Change of hostname:
vim /etc/hostname
hostnamectl set-hostname new_name
Change DNS:
Configuration file: /etc/resolv.conf
Usually, the main change that can be temporarily changed
is to prepare and change in eth0 or other network cards.
/etc/sysconfig/network-scripts/ifcfg-eth0 改变。
ifdown eth0 && ifup eth0 shutdown and restart eth0
hosts file:
Path: /etc/hosts, you can modify the local resolution
Custom resolution: echo "127.0.0.1 www.baidu.com " >> /etc/hosts
Turn off selinux:
Path: /etc/selinux/config
getenforce View the status of selinux
setenforce temporarily sets the state of selinux (setenforce 0 off / setenforce 1 on)
sed -i 's/SELINUX=disabled/SELINUX=enforcing/' /etc/selinux/config
sed -i '7s/disabled/enforcing/' /etc/selinux/config
firewall
netfilter firewalld -->iptables management tool:
Turn off the firewall:
systemctl disable firewalld (permanently off, not starting at boot)
systemctl stop firewalld (temporarily stop)
Install the iptables management tool:
（netfilter--->iptables 是它的管理工具，censt os 6 以前是用的这个）
yum install iptables-services
systemctl enable iptables 把iptables 加入开机自动启动
systemctl start iptables 开启iptables服务
iptables的使用：
原理图：
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iptables -nvL 可以看默认的表(filter)
默认存放路径：/etc/sysconfig/iptables
清空：iptables -F
保存：service iptables save
重启：service iptables restart
清空数据包： iptables -Z
添加一条规则：iptables -A INPUT -s 192.168.100.100 -p tcp --sport 8080 -d 192.168.100.200 --dport 80 -j DROP
iptables -I INPUT -p tcp --dport 81 -j DROP (插入一条规则，简写)
删除一条规则：iptables -D INPUT -s 192.168.100.100 -p tcp --sport 8080 -d 192.168.100.200 --dport 80 -j DROP
iptables -D INPUT -p tcp --dport 81 -j DROP (删除一条规则，简写)
也可以用行号来删除：
查看行号：iptables -nvL --line-number
删除：iptables -D INPUT 5
查看nat表
iptables -t nat -nvL
