CentOS7 - Multiple gateway & multiple routing table

NIC1 (enp192)	192.168.98.238/24	--> This is the main network already with default gateway
NIC2 (enp224)	192.168.97.238/24	--> This is the second network (vlan public) I wanna add default gateway (97.254)

Step 1 - Create a custom routing table for NIC2

vi /etc/iproute2/rt_tables "1 vl_public"

Please process one of persistent setting method as below : ## Option 1 - "rc.local" persistent setting method : Step 2 - Create the iproute2 default gateway & route script file for NIC2

vi /root/multigateway-ruleadd-routeadd.sh /sbin/ip rule add from 192.168.97.0/24 table vl_public /sbin/ip rule add to 192.168.97.0/24 table vl_public /sbin/ip route add default via 192.168.97.254 table vl_public

Step 3 - Save the script file, change mode as executable then add in "rc.local" :

chmod +x /root/multigateway-ruleadd-routeadd.sh chmod +x /etc/rc.d/rc.local vi /etc/rc.local /root/multigateway-ruleadd-routeadd.sh

Step 4 - Reboot the server and validate the iproute2 rules and routing for new default gateway NIC2

# ip rule show 0: from all lookup local 32764: from all to 192.168.97.0/24 lookup vl_public <-- THIS 32765: from 192.168.97.0/24 lookup vl_public <-- THIS 32766: from all lookup main 32767: from all lookup default

## Option 2 - "ifup-route & ifup-rule" persistent method : Step 2 - Create the iproute2 default gateway file for NIC2

vi /etc/sysconfig/network-scripts/route-ens224 default via 192.168.97.254 table vl_public

Step 3 - Create the iproute2 rules file for NIC2

vi /etc/sysconfig/network-scripts/rule-ens224 from 192.168.97.0/24 table vl_public

Step 4 - Reboot the server and validate the iproute2 rules and routing for new default gateway NIC2

# ip rule show 0: from all lookup local 32765: from 192.168.97.0/24 lookup vl_public <--- THIS 32766: from all lookup main 32767: from all lookup default