Before:
root@OpenWrt:~# ip -4 addr; ip -4 route; ip -4 rule; ip -4 route list table all
.
.
.
default via 10.3.6.243 dev tun0 table 202
default via 10.0.82.23 dev tun1 table 203
0.0.0.0/1 via 10.0.82.2 dev tun1
0.0.0.0/1 via 10.3.6.1 dev tun0
root@OpenWrt:~# ip ro del default via 10.3.6.243 table 202
root@OpenWrt:~# ip ro add default via 10.3.6.1 table 202
root@OpenWrt:~# ip ro del default via 10.0.82.23 table 203
root@OpenWrt:~# ip ro add default via 10.0.82.2 table 203
After that:
root@OpenWrt:~# ip -4 addr; ip -4 route; ip -4 rule; ip -4 route list table all
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
7: br-lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
inet 192.168.1.1/24 brd 192.168.1.255 scope global br-lan
valid_lft forever preferred_lft forever
9: eth0.2@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
inet 109.91.78.187/22 brd 109.91.79.255 scope global eth0.2
valid_lft forever preferred_lft forever
10: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 100
inet 10.3.6.243/24 brd 10.3.6.255 scope global tun0
valid_lft forever preferred_lft forever
11: tun1: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 100
inet 10.0.82.23/24 brd 10.0.82.255 scope global tun1
valid_lft forever preferred_lft forever
0.0.0.0/1 via 10.0.82.2 dev tun1
0.0.0.0/1 via 10.3.6.1 dev tun0
default via 109.91.76.1 dev eth0.2 proto static src 109.91.78.187
10.0.82.0/24 dev tun1 proto kernel scope link src 10.0.82.23
10.3.6.0/24 dev tun0 proto kernel scope link src 10.3.6.243
82.199.134.162 via 109.91.76.1 dev eth0.2
85.17.28.145 via 109.91.76.1 dev eth0.2
109.91.76.0/22 dev eth0.2 proto kernel scope link src 109.91.78.187
128.0.0.0/1 via 10.0.82.2 dev tun1
128.0.0.0/1 via 10.3.6.1 dev tun0
192.168.1.0/24 dev br-lan proto kernel scope link src 192.168.1.1
0: from all lookup local
32760: from all fwmark 0x30000 lookup 203
32761: from all fwmark 0x20000 lookup 202
32762: from all fwmark 0x10000 lookup 201
32766: from all lookup main
32767: from all lookup default
default via 109.91.76.1 dev eth0.2 table 201
default via 10.3.6.1 dev tun0 table 202
default via 10.0.82.2 dev tun1 table 203
0.0.0.0/1 via 10.0.82.2 dev tun1
0.0.0.0/1 via 10.3.6.1 dev tun0
default via 109.91.76.1 dev eth0.2 proto static src 109.91.78.187
10.0.82.0/24 dev tun1 proto kernel scope link src 10.0.82.23
10.3.6.0/24 dev tun0 proto kernel scope link src 10.3.6.243
82.199.134.162 via 109.91.76.1 dev eth0.2
85.17.28.145 via 109.91.76.1 dev eth0.2
109.91.76.0/22 dev eth0.2 proto kernel scope link src 109.91.78.187
128.0.0.0/1 via 10.0.82.2 dev tun1
128.0.0.0/1 via 10.3.6.1 dev tun0
192.168.1.0/24 dev br-lan proto kernel scope link src 192.168.1.1
broadcast 10.0.82.0 dev tun1 table local proto kernel scope link src 10.0.82.23
local 10.0.82.23 dev tun1 table local proto kernel scope host src 10.0.82.23
broadcast 10.0.82.255 dev tun1 table local proto kernel scope link src 10.0.82.23
broadcast 10.3.6.0 dev tun0 table local proto kernel scope link src 10.3.6.243
local 10.3.6.243 dev tun0 table local proto kernel scope host src 10.3.6.243
broadcast 10.3.6.255 dev tun0 table local proto kernel scope link src 10.3.6.243
broadcast 109.91.76.0 dev eth0.2 table local proto kernel scope link src 109.91.78.187
local 109.91.78.187 dev eth0.2 table local proto kernel scope host src 109.91.78.187
broadcast 109.91.79.255 dev eth0.2 table local proto kernel scope link src 109.91.78.187
broadcast 127.0.0.0 dev lo table local proto kernel scope link src 127.0.0.1
local 127.0.0.0/8 dev lo table local proto kernel scope host src 127.0.0.1
local 127.0.0.1 dev lo table local proto kernel scope host src 127.0.0.1
broadcast 127.255.255.255 dev lo table local proto kernel scope link src 127.0.0.1
broadcast 192.168.1.0 dev br-lan table local proto kernel scope link src 192.168.1.1
local 192.168.1.1 dev br-lan table local proto kernel scope host src 192.168.1.1
broadcast 192.168.1.255 dev br-lan table local proto kernel scope link src 192.168.1.1
Problem still unchanged.
What about IPv6 routes?