Unsolved Help setting up pfsense

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Hey guys! Thanks so much for the Pfsense class. It was awesome. I need to pick your brain and see if you can help me to setup something for a client.
I hope I can explain this. It will be hard without a chart or graphic.
The current setup

Mediaserver
streaming
from port --------------> peplink load balancer <----- 3 WAN (3 x modems) -----> web portal. (en user)
4900 to 4990

The client needed a lot of upload speed so he thought that needed a load balancer to get more upstream bandwidth. Peoplink does that, but the problem is when a session is requested they all come thorough the same IP therefore only one modem takes all the load.

I don't care about fixing his problem, I want to create a solution with pfsense. I am very sure it's possible. I just need you to point me to the right source or material, maybe re-watch some episode here that will give me some light.
This is my challenge:
A user goes to a web portal and request a video. I want to be able to send that request and balance it via three WAN and when the server receives that, start streaming the video back but balancing among the three modems.
I am sure is possible. I guess YouTube was able to do it I am sure pfSense is powerful enough to achieve this.
Any suggestion?
Let me know if you want a graphic or a better explanation of the problem.
Thank you!

@fabian-lazarte,

I would start with the High Availability episode for pfSense for the pfSense side of things.

I hope other pfSense inspired members will also step up and provide some answers here too!

Cordially,
Ronnie Wong
Host, ITProTV

@Ronnie-Wong Thank you Ronnie! I will do that. I will let you know

Trying to install pfsense on PC Engines APU1D4 I can boot the device up in the appliance but get the following issues on menu and won't install:

any idea?

///////////////////////////////

      __ ____                          

_ __ / / | ___ _ __ ___ ___
| ' | |_ \ / _ \ '_ / |/ _ \
| |) | |) | / | | _ \ /
| ./|| |___/ _|| ||/_|
||

+------------Welcome to pfSense-----------+
| | ______
| 1. Boot Multi User [Enter] | / \
| 2. Boot [S]ingle User | / f \
| 3. [Esc]ape to loader prompt | / \ /
| 4. Reboot | / p _/ Sense
| | \ / \
| Options: | _____/ \
| 5. [K]ernel: kernel (1 of 2) | \ /
| 6. Configure Boot [O]ptions... | ______/
| |
| |
| |
+-----------------------------------------+

/boot/kernel/kernel text=0x1223df0 inflate: invalid stored block lengths

readin failed

elf64_loadimage: read failed
can't load file '/boot/kernel/kernel': input/output error
Error while including /boot/menu.rc, in the line:
menu-display
/
Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [/boot/kernel/kernel]...
/boot/kernel/kernel text=0x1223df0 inflate: invalid stored block lengths

readin failed

elf64_loadimage: read failed
can't load 'kernel'

@Dustin-Hoffman-2 said:

/boot/kernel/kernel text=0x1223df0 inflate: invalid stored block lengths

I would say this might be a corrupt image. Please try another pfsense download.

It looks like it tried to compare a checksum of sorts and found they didn't match what was reported by the image.

Cordially,
Ronnie Wong
Host, ITProTV