Usage of Two Network Connections Load Balancing

Hello I am looking for a way to use multiple internet connections to one computer. The initial scenario:

Line 1. low bandwidth, low ping
Line 2. high bandwidth, high ping

For downloads I would use line 2, so that I don’t have to wait for days, but to be able to play something on the computer I would use line 1 in parallel.

I myself use Linux → Arch → Manjaro

I have already come across possibilities to combine the lines,
as an example via hardware with load-balancer, or software-sided.
Unfortunately I didn’t find any information about the kind of balancing. Is round-robin used here, or would there be a possibility to send certain apps to a certain line?

How? Will you put 2 NICs in your computer, one for each WAN connection? Do you have a router with 2 separate WANs? Something else?

What kind? There is plenty of information, you just have to make it a bit clearer how you imagined it.

Used where?

It’s possible. Mangle packet/connection/route marking comes to mind. But it depends on how your network is supposed to look like.

I have to add that this is not Manjaro problem, but a general networking one.

I try to use for example to nics, one is lan and one is wlan.

I mean that i not find a clear way how the packages transferred over the line.
Or in other words i do not find the way that i want to use,

What i have to change to come to the correct section?

Thank your for your answer i hope it is now more clearly.

It is not. :smiley:

This makes no sense. And we aren’t talking about examples.

I don’t think that you know what you want.

It’s like asking “I want to build something to live in, can someone help me?” and expect someone to give you instructions for every possible case.

Okay 2 Nics,
Connected to two Diffrent Gateways.
I want use both at one time.
I want to select if the connection from app x use nic 1,
the connection of app y should use nic 2.

The nic one is connected over my phone to the internet.
The nic two is connected over the copper wire to the internet.

So simply:
Connect to two internet gateways over two different nics and select for each app one nic to use.
Or define rules when a app has to use nic one or nic to.

Ok so, one way at least:
You create a separate routing table for your phone network and then use mangle table in iptables firewall to route mark specific processes that you want forwarded to “phone network” routing table.

Another way: If app supports it, you could bind specific IP of desired NIC to be used by the app. (or you bind it with firejail for example)

Ok, but maybe i need first a way to use two different connections at same time?
And after that i can try your reply above

Yes, that was my point before. You need to start from the bottom.

Also, my examples are very basic and crude. If I find some will, I’ll try it myself. :stuck_out_tongue:

Thanks zbe for giving the hint with Firejail

I have tried it with
firejail --noprofile --net=wlp0s20f3 ping
firejail --noprofile --net=bond0 ping
and it worked!

(First is my wifi device, the second one ethernet.)

If you have a local DNS running on, it doesn’t work because in the sandbox, there is no DNS running on its localhost.
Then, you have to configure another DNS with --dns= (e.g.).

This is really nice!

(Note that firejail is much more powerful and accessing files might be maybe difficult but I don’t know.)

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I am connect currently with my Lan device, the second one is the wifi.
I try to ping, this was the output.
Note wlp3s0 is the wifiy

firejail --noprofile --net=wlp3s0 ping
Parent pid 105521, child pid 105522

Interface MAC IP Mask Status
lo UP
eth0-105521 28:b2:bd:b2:39:28 UP

Child process initialized in 1103.12 ms

Parent is shutting down, bye…

I think it is not working at, for example i can start firefox or chrome but no site is reachable.
It seems not to be the DNS-Server i try to add the dns arg (–dns=, but it does not make a differenz.

It seems to be not a dns problem, the browser cant reach any ip-address.

Well, routing applications (by name) wherever and whenever you feel like isn’t a trivial task. So it would help if you told us exactly what you would like to do/what is your intended use for this.

In regards to firejail, you probably need to run it as sudo for ping to work. And can’t remember if I used any special settings in firefox itself, but I have a working firejailed firefox that has a secondary IP bound to it (which is routed differently in router).

Even firewall (iptables) isn’t capable of distinguishing apps solely by their name/pid/command. You can do it for UID and GID, which I was just playing with (running app with sudo -g some_group ... which then uses different routing table). But in the end all these solutions feel hacky.

EDIT: Another way would be to use namespaces.

i want all apps that often need to download large files like steam to be bound to the nic with the large bandwidth. realtime application on the other hand should use the line (nic) with low bandwidth and a good ping.

For example:
I want that Chrome use the nic: enp0s20u1
I want that i can use Firefox to over nic wlp3s0

And i want use both apps together (at same time), so bound a app to a nic (etternet gateway), and use two nics together.

The apps are examples, you can put every app in that you want…

Ok. But it depends on applications. For example if you are using qbittorrent, you can choose which interface or IP it should bind to right in its settings. If app supports it, that is quickest solution. You can do same with ping and traceroute btw (select interface).

Anyhow, need to do some more testing with VRFs to see what’s easiest.