@TP-Link_Deco Thanks for the Reply

 

ill answer as best i can!

 

1 - I have 6 decos, the main deco connected to the router (Huawei B535 4G) is in the middle of the House, the rest are dotted around the house accross 2 floors. All Deco's are connected Wireless and all except one show strong reception.

 

2 - I changed the operation mode to Access Point when this issue first occured and it didnt make any difference. its still set to Acess Point. Fast Roaming is enabled as well as Beamforwarding. 2.4ghz and 5ghz are enabled.

 

3 - When i connect to the router directly i do not have the problem.

 

4 - Initially the problem was all the time, but 2 weeks ago it just started working. Ive had no problems at all for 2 weeks, then yesterday half way through the day its just reverted back and i need to try everything twice.

 

Thanks

 

Nick

 

 

 

 

I am encountering the same issue. On multiple computers/devices, I often get a page not found error, which is solved by refreshing - often requiring a number of refreshes.

 

I have 3 Deco M4(R) units, installed on the same floor. They are in access point mode, with one unit attached to the cable modem/router. Backhaul is wireless, with the two other units being linked to the main unit. The issue occurs on iphone and mac, both wirelessly connected to the main unit or satellite units, and with a wired connection to the satellite unit. 

 

This was not a problem when I first installed the system, a few weeks ago. However, it has become worse over the course of last week. I have rebooted individual Decos and the main router. I have also disabled "fast roaming", to no avail.

 

Does anyone have a suggestion?

Thank you.

Simon

Following up on my own message, I have a few more data points: 1) I have tried resetting the modem/router and all Deco units. I powered everything down, and back up in order from the centre to the periphery. At first this seemed to work, but I was disappointed to encounter the same issues after a few minutes. 2) I did not encounter any issues when using a VPN. 3) My ISP+modem/router is running IPV6, so I have a full IPV6 setup. It seems that there is only an issue when establishing a new connection (TCP link?) over the network. When I have an active VPN connection to the server, new connections are established without issue. Nick, was your issue resolved? Simon

@TP-Link 

Thank you for looking into this. 

 

It appears I may have been too quick to point the finger to the (new) Deco M4 in our household. I have done some further investigation and it seems the issue lies with my ISP. They use IPv6 with DS-lite, which forwards IPv4 traffic in a tunnel to their own "carrier grade NAT" (CGNAT). The CGNAT apparently has a fairly low limit on the number of maximum connections, which causes it to send ICMP "unreachable" responses once that limit is exceeded. I can see a flood of such packets coming in using the tcpdump command, once a large number of connections has been made. 

 

I am now trying to resolve this with the ISP.

 

For completeness, here is the response to your queries:

1) The M4 is in AP mode, so I do not have these settings. I am unable to change the DNS settings in the modem/router.

2) No. Once a connection is established, it is fast and solid.

3) The modem/router is an Arris model. You can see it (in Dutch) here: https://www.ziggo.nl/klantenservice/wifi/modem/connect-box 

4) Yes, the issue persists when I disconnect the Deco system and hook my laptop up to the router by ethernet.

 

Thanks once again.