I would like some networking assistance.
case: my isp sells download bandwidth at 1,3,5,...Mb  BUT upload is only 1Mb.
to get more upload I must buy more connections with only one network card.  
I am running Kubuntu on a HP6730b.
How so I setup Tixati or the simple wireless router to access multiple connections?
Fibre modem --> Xiaomi student router  -->   laptop

Your wifi router does not support dual WAN
and since your using a laptop I doubt you have dual RJ45's
So unless you're ready to invest in some hardware it can't be done.

I have used dual internet connections for years. My choice is to use old cisco/linksys RV series multi-WAN routers. RV-042, RV-082, RV-016
these are long discontinued but readily available on ebay.

Cisco kept these models when it sold Linksys off to others. And they have been superceded by RV-320, 325, 340, 345

Some old discussions:

http://www.dslreports.com/forum/r19267080-Best-Dual-Wan-Router

https://www.broadbandbuyer.com/store/broadband-routers/dual-wan-routers/

If your laptop has two network interfaces, ie, WiFi and Ethernet adapters. You can use both to connect to the internet by tweaking registry entries in Windows.

First, make sure Tixati is NOT bound to either interface.

thank you. I will have to translate that to Linux.

To combine multiple ISP connections for increased upload bandwidth, you can use WAN aggregation or load balancing. Here’s how you can do it:

Option 1: Using a Router with WAN Load Balancing
Get a Multi-WAN Router – Look for a router that supports WAN load balancing (e.g., TP-Link ER605, Ubiquiti EdgeRouter, MikroTik hEX).
Connect Multiple ISP Lines – Plug each ISP connection into separate WAN ports on the router.
Enable Load Balancing – Configure the router to distribute upload traffic across multiple connections.
Option 2: Using Kubuntu for Network Bonding
If you only have one network card, you can use network bonding with a USB Ethernet adapter:

Install ifenslave (if not installed):
bash
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Edit
sudo apt install ifenslave
Edit Network Configuration:
Open the Netplan config file (/etc/netplan/01-netcfg.yaml) and add:
yaml
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network:
 version: 2
 renderer: networkd
 ethernets:
   eth0:
     dhcp4: no
   eth1:
     dhcp4: no
 bonds:
   bond0:
     interfaces:
     mode: balance-rr
     dhcp4: yes
Apply Changes:
bash
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sudo netplan apply
This will distribute the upload load across multiple connections. However, for torrenting (Tixati), you might need policy-based routing to force traffic through multiple gateways.

If you're looking for better networking hardware, consider upgrading to an HPE Aruba JL675A 6100 switch, which offers great performance for handling multiple network interfaces!