centos7 双网卡同网段双网关配置

需求：

#1、服务器为双网卡；

#2、网卡1为互联网

172.16.137.99/24/254

#3、网卡2为旅游专网

172.16.137.97/24/1

#4、互联网路由器为172.16.137.254

#5、旅游网需访问网关 172.16.134.1、135.1、136.1 。。。

#6、实现服务器被互联网访问，也能被旅游网访问；

1、配置网卡

网卡1

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eno1

PROXY_METHOD="none"

BOOTPROTO="static"

DEFROUTE="yes"

IPV4_FAILURE_FATAL="no"

NAME="eno1"

DEVICE="eno1"

ONBOOT="yes"

IPADDR="172.16.137.99"

PREFIX="24"

GATEWAY="172.16.137.254"

DNS1="60.255.80.18"

DNS2="60.255.80.19"

[root@localhost ~]#

网卡2(不要设置GATEWAY，不要设置GATEWAY，不要设置GATEWAY，重要的事情说三遍！)

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eno2

PROXY_METHOD="none"

BOOTPROTO="static"

DEFROUTE="yes"

IPV4_FAILURE_FATAL="no"

NAME="eno2"

DEVICE="eno2"

ONBOOT="yes"

IPADDR="172.16.137.97"

PREFIX="24"

GATEWAY="172.16.137.1"

DNS1="60.255.80.18"

DNS2="60.255.80.19"

[root@localhost ~]#

2、查看ip地址

[root@localhost ~]# ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    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: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000

    link/ether ec:aa:a0:19:85:98 brd ff:ff:ff:ff:ff:ff

    inet 172.16.137.99/24 brd 172.16.137.255 scope global noprefixroute eno1

       valid_lft forever preferred_lft forever

    inet6 fe80::eeaa:a0ff:fe19:8598/64 scope link

       valid_lft forever preferred_lft forever

3: eno2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000

    link/ether ec:aa:a0:19:85:99 brd ff:ff:ff:ff:ff:ff

    inet 172.16.137.97/24 brd 172.16.137.255 scope global noprefixroute eno2

       valid_lft forever preferred_lft forever

    inet6 fe80::eeaa:a0ff:fe19:8599/64 scope link

       valid_lft forever preferred_lft forever

4: enp0s26u1u2u5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

    link/ether ee:aa:a0:19:85:9f brd ff:ff:ff:ff:ff:ff

[root@localhost ~]#

ip配置生效，测试网关只有网卡1通，网卡2不通。

3、添加路由

查看路由

[root@localhost ~]# route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

0.0.0.0         172.16.137.254  0.0.0.0         UG    100    0        0 eno1

0.0.0.0         172.16.137.1    0.0.0.0         UG    101    0        0 eno2172.16.137.0    0.0.0.0         255.255.255.0   U     100    0        0 eno1

172.16.137.0    0.0.0.0         255.255.255.0   U     101    0        0 eno2

[root@localhost ~]#

添加临时路由，既然需要通不同旅游专网网段，我添加目标路由172.16.0.0 16位子网掩码到172.16.137.1出

route add -net 172.16.0.0 netmask 255.255.0.0 gw 172.16.137.1

再查看路由

[root@localhost ~]# route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

0.0.0.0         172.16.137.254  0.0.0.0         UG    100    0        0 eno1

0.0.0.0         172.16.137.1    0.0.0.0         UG    101    0        0 eno2

172.16.0.0      172.16.137.1    255.255.0.0     UG    101    0        0 eno2

172.16.137.0    0.0.0.0         255.255.255.0   U     100    0        0 eno1

172.16.137.0    0.0.0.0         255.255.255.0   U     101    0        0 eno2

[root@localhost ~]#

其他旅游专线专线，能ping通，也能被其他旅游网专线ping通。至此路由配置已通。

4、添加永久路由

#1、添加route文件，文件名route + 网卡名

[root@localhost ~]# vim /etc/sysconfig/network-scripts/route-eno2

#2、添加路由

172.16.0.0/16 via 172.16.137.1 dev eno2

#3、重启网络

systemctl restart network

巴特西

centos7 双网卡同网段双网关配置

1、配置网卡

2、查看ip地址

3、添加路由

4、添加永久路由

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