there is an easy setup LAN as you can see here:
Now I try to add a second internet connection only for server backups to a specific cloud host as you can see here:
lets say cloud host has IP: 111.222.333.444
ether1: 2nd internet gateway
ether2: LAN switch
ether3: LAN server
I bridged ether2 and ether3 (maybe this is already one of the mistakes?)
I tried to mangle with prerouting chain and "mark routing" all connections to 111.222.333.444 and gave these packets a routing mark "backup".
After that I added a new route for the marked packets to 2nd internet gateway.
The problem is that no packets are marked. As a result of this the server still uses the default internet connection to connect to cloud backup server.
Can you please help me to get it working?