mjhjmtu

I'm trying to set up kind of "on my demand dynamic routing".
Basically, when I activate a script , I would like it mounts a new interface (tun vpn for example) and define the appropriate firewall and routing rules to route the dedicated traffic.
Here it is just the begining with a simple SSH connection.

Here are my iptables rules:

iptables -A OUTPUT -d X.X.X.X -j MARK --set-mark 2
iptables -A OUTPUT -d X.X.X.X -j ACCEPT
iptables -A INPUT -s -d X.X.X.X -j ACCEPT

Here is my default route in normal operating condition:

[root@localhost ~]# ip route
default via 192.168.0.1 dev enp0s3 proto dhcp metric 20100 
192.168.0.0/24 dev enp0s3 proto kernel scope link src 192.168.0.23 metric 100 
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown

And my added routing rule for SSH:

ip route add default via 192.168.0.1 table 3
ip rule add fwmark 2 table 3
ip route flush cache

Check routes:

[root@localhost user]# ip route show table 3
default via 192.168.0.1 dev enp0s3 

[root@localhost user]# ip route show table main
default via 192.168.0.1 dev enp0s3 proto dhcp metric 20100 
192.168.0.0/24 dev enp0s3 proto kernel scope link src 192.168.0.23 metric 100 
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown 

So, my SSH connection is working fine with this setup.
Now, I would like to route all my outbound flows though an other interface, except my SSH connection.
What is do not understand is that when I change the default route, my SSH connection is lost and the routing table 3 does not seem to be taken.

For example:

ip route del default 
ip route add default via 10.0.0.1

Following these cmdlines, my SSH connection is completely lost.
Why is the routng table 3 not taken?