@8411guy just received this from TP-Link. fingers crossed.

"

Dear Customer, 

Our R&D colleagues have initially located the cause of the problem and are currently testing it. We will keep in touch with you if there are any updates.

We are sorry for the inconvenience caused by the use of the product."

  @KPejman sweet. I got something similar. Fingers crossed! 

  @8411guy they just released an update but it didn't make much difference for me. 

how's your experience after the update ?

  @KPejman nothing has changed for me with 1.0.2

  @8411guy I sent them another email to confirm if the fix was part of this release or there is another issue.

haven't heard back yet. 

  @8411guy 

I have run through MANY different iterations of this using the BGW320 device and a 2Gb line.

I finally figured out everything I needed to do to get a solid 2.4Gbps connection Upload and Download pretty consistently.

The actual key to this for me was in fact the ER8411 settings in combination with settings on the AT&T device.

(Make note that I have multiple switches here as per my network setup, but the same results can be achieved with the SG3210XHP directly into the ER8411).

Here's what I have, and maybe it'll help.

My Setup is:  

Alienware R9 with TP-Link TX201 2.5Gb adapter (Realtek chipset)

     Flow Control: Rx and Tx Enabled (Default setting)

     Jumbo Frames: Disabled (Default setting)

    [Speed Test Performed with Ookla desktop app:]

    [https://www.speedtest.net/apps/desktop]

---PC Connected to Dist Switch with Cat 6a---

TP-Link Jetstream TL-SG3210XHP-M2 

    Running in full-config mode

    Flow Control: Enabled  

    Frames MTU: 1518

---Dist Switch Connected to Core Switch with 10G Twinax cable---

TP-Link JetStream TL-SX3008F 

    Running in full-config mode

    Flow Control: Enabled    

    Frames MTU: 1518

---Core Switch Connected to ER8411 Firewall with 10G Twinax cable---

TP-Link ER8411 (Firmware 1.01 Build 20221110 Rel 64164)

    Running in full-config mode

      LAN connection in Port 2 (10Gb SFP+ Port).

       SFP Used: TP-Link SM5310-T RJ45 SFP+ 10G (10BASE-T compatible)

       (Note: Also tried a MikroTik S+RJ10 but it did not give me as good results)

       [Also Note: I left DDM Status off, esp as I noticed temp is about 72.8 Celcius / 163 Fahrenheit.

       This is technically just over the documented limit of 0-70 Celcius stated by TP-Link for commercial products OT.

       Enabling this CAN and probably WILL cause the port to shut down at times].

      Network \ Switch 

           Rate Control on Port 2 - Ingress Limit and Egress Limit Disabled, set to 10000Mbps (Default); 

           Port Config on Port 2 - Flow Control Enabled; Negotiation Mode 10000M Full-Duplex

      Network \ WAN

            SFP+ WAN1 is used with Static IP (but could be dynamic as well)

             Upstream Bandwidth = 5000000 Kbps 

             Downstream Bandwidth = 5000000 Kbps

             MTU = 1500

             Negotiation Mode = 10000M Full Duplex

             Flow Control = Enabled

    ---ER8411 Firewall Connected to AT&T Router with CAT 6a cable---

    AT&T BGW320-500

       Connected to 5Gbs Port 

       BROADBAND:

           BB Source Override: Fiber

           Base MTU:   1500

      Home Network \ Configure

          Ethernet Port 1: 5G Full Duplex (Auto MDI-X)

          IPv6:  DISABLED (Can present issues)

          WIFI:  DISABLED (Using TP-Link Omada APs instead)

      Subnets & DHCP:

         Private LAN Subnet:   192.168.1.254

         Subnet Mask:              255.255.128.0

         DHCP Server:  Disabled

       (Note that I am using a Static IP from AT&T, so these settings are specific to that usage).

         Public Subnet Mode: ON

         Allow Inbound Traffic: OFF   (Turn on when needed only, and remember to only use pinholes)

        Public Gateway IP:    99.30.xxx.xxx

        Public Subnet Mask:  255.255.255.248

        DHCP: Blank

        Cascaded Router: OFF

      Firewall Status:

          Packet FIlter: ON (Default)

          IP Passthrough: OFF

          NAT Default Server: OFF

          Firewall Advanced: ON (Default)

       (I would recommend keeping the firewall turned on.  I found no difference in speed).

Also note, that I am using AT&T ActiveArmor internet security service that comes free.

I've not noticed issues with this.

I do not run my switches or firewall via Omada, as it does not allow you to modify many settings (such as Flowcontrol).

I tried this in Omada mode first, with very poor results on my SB network. 

I love Omada for wireless and that's it.

  @8411guy TP Link support was able to send me a copy of the firmware with flow controll enbabled and this finally did the trick!

  @8411guy what firmware version is that? 

I received am auto update for version 1.0.2. is it a different version ?