CentOS7内外网双IP配置实践

1，配置内网IP：ifcfg-eno1

TYPE="Ethernet"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
NAME="eno1"
UUID="e4f6837c-e6a0-44ed-a8bf-0145d87a3493"
DEVICE="eno1"
ONBOOT="yes"
IPADDR="128.0.3.251"
PREFIX="21"
GATEWAY="128.0.3.1"
DNS1="内网DNS"
IPV6_PEERDNS="yes"
IPV6_PEERROUTES="yes"
IPV6_PRIVACY="no"

2，配置外网IP：ifcfg-eno2

TYPE="Ethernet"
BOOTPROTO="none"
DEFROUTE="yes"
NAME="eno2"
UUID="2eaf6606-516b-44d7-bb94-23f0f66dae0a"
DEVICE="eno2"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
ONBOOT="yes"
IPADDR="121.126.29.242"
GATEWAY="121.126.29.241"
DNS1="外网DNS"
IPV6_PEERDNS="yes"
IPV6_PEERROUTES="yes"
IPV6_PRIVACY="no"
NETMASK="255.255.255.252"
HWADDR="fc:15:b4:10:ca:55"
NM_CONTROLLED=yes

3，配置路由：这步是关键 

route add -net 128.0.0.0 netmask 255.255.248.0 gw 128.0.3.1 eno1
route add -net 121.126.29.240 netmask 255.255.255.252 ge 121.126.29.241 eno2
route add default gw 121.126.29.241 eno2

 最后一句默认网关是重点

4，配置永久生效：/etc/rc.local

route add -net 128.0.0.0 netmask 255.255.248.0 gw 128.0.3.1 eno1
route add -net 121.126.29.240 netmask 255.255.255.252 ge 121.126.29.241 eno2
route add default gw 121.126.29.241 eno2

  

5，调试过程：

 》 1，拔掉外网网线，测试内网是否联通

 》 2，拔掉内网网线，测试外网是否联通

 》 3，同时插上内外网线，网络联通性

 》 4，查看路由表：

netstat -rn

  》 5，删除路由表：

route del -net default netmask 0.0.0.0 gw 128.0.3.1 eno1