@David-TP 

Hello David-TP,

I replied to your email and thought you received this information. I see that you didn't...

I am using Verizon’s Home 5G Network. I am seeing a performance slow down due to MTU size mismatch. I have the DECO X60 setup in Router Mode, DHCP Server, and WIFI Mesh network. I have disabled DHCP, and WIFI, etc on the Verizon router so that I could take full advantage of the X60 capabilities. Making the change to the X60 is when I noticed the slow down. In my research why I found that the MTU size on the Verizon Home 5G network is set to 1400 + 28 = MTU Size of 1428.  When I take a laptop and override the MTU size of 1500 set by the DECO x60 to 1428 the WIFI performance almost doubles in speed.
 

Doing some quick research I found that this is a problem with all 5G Home Networks. They are all set at 14xx. This mismatch in MTU size as you know causes quite the performance issue.

Please advise if the MTU setting can be changed on the X60?  If not, please advise if any other configuration would work?  

Example of MTU using a Verizon Home 5G Network:

C:\WINDOWS\system32>ping google.com -f -l 1500

Pinging google.com [142.250.69.206] with 1500 bytes of data:

Packet needs to be fragmented but DF set.

Packet needs to be fragmented but DF set.

Packet needs to be fragmented but DF set.

Packet needs to be fragmented but DF set.

Ping statistics for 142.250.69.206:

    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\WINDOWS\system32>ping Google.com -f -l 1400

Pinging google.com [142.250.69.206] with 1400 bytes of data:

Reply from 142.250.69.206: bytes=68 (sent 1400) time=33ms TTL=112

Reply from 142.250.69.206: bytes=68 (sent 1400) time=40ms TTL=112

Reply from 142.250.69.206: bytes=68 (sent 1400) time=37ms TTL=112

Reply from 142.250.69.206: bytes=68 (sent 1400) time=31ms TTL=112

Ping statistics for 142.250.69.206:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

    Minimum = 31ms, Maximum = 40ms, Average = 35ms

netsh interface ipv4 show subinterfaces

   MTU  MediaSenseState   Bytes In  Bytes Out  Interface

------  ---------------  ---------  ---------  -------------

  1500                1   3990686     572402  Wi-Fi 4294967295              1          0 33396189  Loopback Pseudo-Interface 1

  1500                5          0          0  Local Area Connection* 1

  1500                5          0          0  Bluetooth Network Connection

  1500                5          0          0  Local Area Connection* 11

netsh int ipv4 set subinterface "Wi-Fi" mtu=1428 store=persistent

C:\WINDOWS\system32>netsh int ipv4 set subinterface "Wi-Fi" mtu=1428 store=persistent

Ok.

Thanks in advance.

  @Goody1 

Hello TP-Link / Deco,

Please reply to my question on modifying the MTU size when using 5G Home Network. If the MTU size on the Deco x60 cannot be modified I will need an alternative method to address the poor performance of the x60's. 

  @Goody1 Did you ever hear back on this? I have a 5G LTE router from Verizon and the X60. Right now the mesh is in AP mode and I guess I'll just leave it there - not having performance issues so much, but was hoping to maybe flip it to router mode. Thanks.