网卡 - linux - 配置虚拟LO回环

• 网卡 - linux - 配置虚拟LO回环

  • 用于响应请求处理
• 关闭网络配置管理器，避免网络接口冲突

systemctl stop NetworkManager
systemctl disable NetworkManager

•  切换到网卡配置文件目录: cd /etc/sysconfig/network-scripts
• 创建回环子配置文件：cp ifcfg-lo ifcfg-lo:1

• 配置回环子配置文件

DEVICE=lo:1
IPADDR=192.168.213.77
NETMASK=255.255.255.255
BROADCAST=127.255.255.255
ONBOOT=yes
NAME=loopback

• 服务器配置arp（响应配置）

  • arp配置参数
    • arp-ignore：ARP响应的级别（处理请求）
      • 0：只要本级配置了ip，就能响应请求
      • 1：请求的目标地址到达对应的网络接口才会响应
    • arp-announce：ARP通告行为（返回响应）
      • 0：本机上任何网络接口都向外通告，所有的网卡都能接收到通告
      • 1：尽量避免本网卡与不匹配的目标通告
      • 2：至在本网卡通告
• 编辑配置文件 vim /etc/sysctl.conf

# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
#所有入为1
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.lo.arp_ignore = 1
#所有出为2
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2

• 刷新响应配置 
  •  sysctl -p

• 把接收到的192.168.213.77数据报文让lo去响应 
  • route add -host 192.168.213.77 dev lo:1

•  配置为开机自动装配
  • echo "route add -host 192.168.213.77 dev lo:1" >> /etc/rc.local

•  查看路由配置
  • route -n

•  重启网络服务

  • service network restart

• 查看ip配置
  • ip addr