CentOS dual-NIC dual IP settings

Network environment: Two IP addresses, 192.168.0.10 and 10.10.30.2, the mask is 255.255.255.0, and the gateway addresses of these two subnets are 192.168.0.1 and 10.10.30.1 respectively.

1. Configure the IP address 192.168.0.10 for the NIC eth0, configure the IP address for the NIC Eth1 to 10.10.30.2 profile as:
/etc/sysconfig/network-scripts/ifcfg-eth0
/etc/sysconfig/network-scripts/ifcfg-eth1

2. Configure the default gateway to any one. This default gateway determines the interface that the system uses when it actively uses the network.

Configuration file:/etc/sysconfig/network

3. Edit the routing table

To modify/etc/iproute2/rt_tables, add content:

252 Net2
251 Net3

#/etc/rc.local adding the original path back route

IP Route Flush Table Net2
IP route add default via 192.168.0.1 dev eth0 src 192.168.0.10 table Net2
IP rule add from 192.168.0.10 table Net2

IP Route Flush Table Net3
IP route add default via 10.10.30.1 dev eth1 src 10.10.30.2 table Net3
IP rule add from 10.10.30.2 table Net3

CentOS dual-NIC dual IP settings