I would like to use nmcli (NetworkManager, on CentOS) to balance the load from the subnet 172.22.0.0/24 across the two gateways (.3 and .1) on the 192.168.1.0/24 subnet. These two gateways are connected to two different ISP commercial fiber-optic routers. The network looks like this:
And the three NICs on balancerouter look like this:
===============================================================================
Device details (enp2s0)
===============================================================================
IP4.ADDRESS[1]: 192.168.1.22/24
IP4.GATEWAY: 192.168.1.3
IP4.ROUTE[1]: dst = 0.0.0.0/0, nh = 192.168.1.3, mt = 101
IP4.ROUTE[2]: dst = 192.168.1.0/24, nh = 0.0.0.0, mt = 101
IP4.DNS[1]: 9.9.9.9
---------------------------------------------
===============================================================================
Device details (enp1s0)
===============================================================================
IP4.ADDRESS[1]: 172.22.0.1/24
IP4.GATEWAY: --
IP4.ROUTE[1]: dst = 172.22.0.0/24, nh = 0.0.0.0, mt = 100
IP4.DNS[1]: 9.9.9.9
---------------------------------------------
===============================================================================
Device details (enp3s0)
===============================================================================
IP4.ADDRESS[1]: 192.168.1.23/24
IP4.GATEWAY: 192.168.1.1
IP4.ROUTE[1]: dst = 0.0.0.0/0, nh = 192.168.1.1, mt = 102
IP4.ROUTE[2]: dst = 192.168.1.0/24, nh = 0.0.0.0, mt = 102
IP4.DNS[1]: 9.9.9.9
---------------------------------------------
At the moment all traffic from 172.22.0.0/24 is routed through 192.168.1.3, because (I believe) the mt (metric) value is lower than that of 192.168.1.1.
Can I use nmcli to 'load balance' traffic from 172.22.0.0/24 between 192.168.1.1 and 192.168.1.3 and to ensure failover if one of the ISP routers stops working?
