2 x Uplinks load balancing issues

Installing and Using OpenWrt
1

my configuration reference: https://www.lartc.org/howto/lartc.rpdb.multiple-links.html

Just a router with 2 WANs, I am trying to use routing for load balancing. But it doesn't work. I would be very much grateful if someone could kindly advise me on

WAN1(eth1): Static 8.8.8.8, Gateway: 8.8.8.9
WAN2(eth2): Static 9.9.9.9, Gateway: 9.9.9.10

My configuration:

Step 1: Create two routing tables
echo "251 T1" >> /etc/iproute2/rt_tables
echo "252 T2" >> /etc/iproute2/rt_tables

Step2:
For direct connection subnet 8.0.0.0/8, use WAN1
ip route add 8.0.0.0/8 dev eth1 src 8.8.8.8 table T1
ip route add default via 8.8.8.9 table T1

For direct connection subnet 9.0.0.0/8, use WAN2
ip route add 9.0.0.0/8 dev eth2 src 9.9.9.9 table T2
ip route add default via 9.9.9.10 table T2

Step3: The following 4 command line are to ensure that the data go through(out/in) the same WAN port

Make sure the correct ingress (from) is selected.
ip route add 8.0.0.0/8 dev eth1 src 8.8.8.8
ip route add 9.0.0.0/8 dev eth2 src 9.9.9.9
Make sure the correct outlet is selected. :
ip rule add from 8.8.8.8 table T1
ip rule add from 9.9.9.9 table T2

**Step4:**The last command line below is not suitable for openwrt, so it has to be changed as follows

original:    ip route add default scope global nexthop via $P1 dev $IF1 weight 1 nexthop via $P2 dev $IF2 weight 1

changed to: ip route add default nexthop via 9.9.9.10 metric 5  <--this is secondary default route

The problem comes from the secondary default route: <e.g. traceroute 99.99.99.99> next hop always is 8.8.8.8 (I think it should be 8.8.8.9), even WAN1 (eth1) is unplugged, I expect all the traffic at this time go through this secondary default route (WAN2), but the next hop is still 8.8.8.8

root@OpenWrt:~# traceroute 99.99.99.99
traceroute to 99.99.99.99 (99.99.99.99), 30 hops max, 46 byte packets
 1  **8.8.8.8** (8.8.8.8)  3144.170 ms !H  3155.131 ms !H  3119.875 ms !H

root@OpenWrt:~# ip route show
default via 8.8.8.9    dev eth1
default via 9.9.9.10  dev eth2  metric 5
8.0.0.0/8 dev eth1   scope link  src 8.8.8.8
8.8.8.0/24 dev eth1 scope link  src 8.8.8.8
9.0.0.0/8 dev eth2   scope link  src 9.9.9.9
9.9.9.0/24 dev eth2 scope link  src 9.9.9.9
192.168.1.0/24 dev br-lan scope link  src 192.168.1.1

root@OpenWrt:~# ip rule list
0:         from all lookup local
32764:  from 9.9.9.9 lookup T2
32765:  from 8.8.8.8 lookup T1
32766:  from all lookup main
32767:  from all lookup default


root@OpenWrt:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         8.8.8.9         0.0.0.0         UG    0      0        0 eth1
0.0.0.0         9.9.9.10        0.0.0.0         UG    5      0        0 eth2
8.0.0.0         0.0.0.0         255.0.0.0       U     0      0        0 eth1
8.8.8.0         0.0.0.0         255.255.255.0   U     0      0        0 eth1
9.0.0.0         0.0.0.0         255.0.0.0       U     0      0        0 eth2
9.9.9.0         0.0.0.0         255.255.255.0   U     0      0        0 eth2
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 br-lan
2

Are you aware of mwan3 package?

3

Thank you for your suggestion, please ignore all my configuration above, except the configuration of the two WAN interfaces.

WAN_a(eth1): Static 8.8.8.8, Gateway: 8.8.8.9
WAN_b(eth2): Static 9.9.9.8, Gateway: 9.9.9.9

It's an Openwrt router with 2 WANs and I'm trying to load balance them by using routing only (mwan3 won't be used). When one WAN fails, the other WAN handles all traffic

Won't use mwan3， because I want to use the WAN_b for both Wireguard traffic and default traffic. I know that mwan3 uses "mark" to randomly load traffic on the two WAN ports. I am afraid that the wireguard cannot only go through the WAN_b, but also go through the WAN_a, causing wireguard problems.

4

An Openwrt router with 2 WANs, I'm trying to load balance them by using routing only (mwan3 won't be used). When one WAN fails, the other WAN handles all traffic and WAN_b should handle both Wireguard traffic and default traffic. Is the following configuration correct? I would be very much grateful if someone could kindly advise me on

WAN (eth1): static 8.8.8.8 gateway:8.8.8.9
WAN_b(eth2): static 9.9.9.8 gateway:9.9.9.9

ip route add default via 8.8.8.9 dev eth1 table wan
ip route add default via 9.9.9.9 dev eth2 table wan_b
ip rule add from all lookup wan
ip rule add from all lookup wan_b

ip rule add from all table wan
ip rule add from all table wan_b

**The following is for wireguard, its peers all go 9.9.9.9 (WAN_b)**
ip rule add from 192.168.100.1/24 table 100
ip rule add from 192.168.100.2/24 table 100
ip rule add from 192.168.100.3/24 table 100
ip route add default via 9.9.9.9 dev eth2 table 100

ip address add 192.168.100.1/24 dev wg0
ip address add 192.168.100.2/24 dev wg0
ip address add 192.168.100.3/24 dev wg0
5

You can use a different policy for the wireguard tunnel to use one interface only.