Issue with dual lan and network speed observed on AX88PRO and ROG AX11000PRO

[cata2ca]

Guys, I found something that puzzles me. I have 2 network feeds in my house, one is a coax cable modem rated for 1.5 Gb speed and a cellular modem going anywhere between 50Mbs at rush hour to 100Mbs at night. I tried all options, single lan, dual lan w/fail over and load balance, could not get more that 1.1 Gb max. I was always blaming the SP that they would slow down the speed below what they advertise.  Few days ago I was playing with DDNS in load balance ( actually not working ) and I reversed ( only in settings ) Primary and Secondary WAN and guess what...I almost doubled the speed. I can provide screenshots but you can try yourself. 

All I did in Dual Wan page was to select ( in Dual WAN) Primary Wan the cellular /slow connection and  Secondary Wan the cable / fast connection. The speed was observed even after 2 cascaded 1Gbs switches where speed increased from 750 to almost 975. To make it clear all I did was to change the order in the router, I did not touch any cables !!!!

Scenario 1

Dual Wan Load Balance / Primary Wan - Cable Modem - port Wan 1Gb/2.5Gb / Secondary Wan - Cellular Modem - port Lan 2/ Router speed max 1.150 Gb / Lan  / Load balance configuration 9:1

1--------Router internal speed test 1.150 Gb max  -  Lan Speed ( after 2 x 1Gbs switch hoops) 750Mbs using Okla. laptop app.

Scenario 2

Dual Wan Load Balance /  Primary Wan Cellular - Modem Router - port Lan 2 / Secondary Wan - Cable Modem - port Wan 1Gb/2.5Gb / Load balance configuration 1:9

2-----Router internal speed test max 1.850 Gb  -  Lan Speed ( after 2 x1Gbs switch hoops) 975Mbs using Okla. laptop app.

Replaced 1.0/2.5Gb port with 10Gb port as Primary Wan on 11000 with same results

Can anybody figure out why I can not get this speed both ways?

Thanks

[Saltgrass]

I can't really get into your specific configuration, but to me, your situation would only work if you used the cellular as failover.  The disparity between the two sources is such it doesn't make sense to force the router to go through the process of selecting different WANs.

[cata2ca]

Sorry that was not my question. I used for years ( 2019) dual lan failover.

I asked why in dual lan swapping Primarely with Secondarely Wan  without touching any cables or ports increases the speed by 50%. The speed increase was obseved on my home network after 2 cascaded switches ( I have 24 ports Gig SW in the electrical room after router and 5 ports Gig by my desk ) by 20% ans only limmited by specs ( 1 Gb switches ). 

Thats why I asked you guys to try. I am a quiet tester and I never post something unless is obvious. I do not need support.

I encourage you all to test and get to the root cause, software or hardware. 

Have a nice day

[Saltgrass]

Have you tried changing the 9:1 ratio without changing anything else?

My cable modem gives me about 16% more speed than advertised.

I could test only if I used my cell phone as a source.  

[Cata2]

Yes I tried 3:1 7:3 and 9:1. I did not see any difference. 
 From what I read the sum of the 2 number is preferable to be 10.

However you do kit need 2 Wan, just setup the router with 2, even one will appear not connected .

After you test and measure the speed with Primarily Wan ( Secondarily Wan is disconnected ) flip them, reboot and test again.
In load balance the second network speed does not count as the test is done through the fastest connection. 
I am curious if you get same results, like I said I observed this on both firmwares, Asus and Merlin using Rog GT-AX11000PRO and AX88PRO. I did not try on a non PRO router but I might give it a try.

[jzchen · Accepted solution]

When calculating load balance ratio I added the upload and download speed of WAN1 : upload + download speed of WAN2, these I rounded to whole numbers.  Keep in mind load balancing works best/better if the two ISPs speeds are somewhat close to each other.  I tried 1074 down/40 up cable modem with 950 down/up fiber.  Since there is such a large difference you may not experience improvement, but an average of the weighted speeds...