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Very strange/specific issue with Netgear DM200 plus ASUS RT-AC3200

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thatbloke

New Around Here
Hello, I'm wondering if you fine people out there might be able to provide some suggestions on what could possibly be the problem I'm experiencing.

I'm in the UK and have VDSL internet with BT (What they call BT Infinity). I've recently purchased the equipment mentioned in the post title to replace the BT router.

After a bit of poking about I have been able to get my internet connection working with this setup and I'm even writing this post via said connection on my PC.

However I have two very specific problems and I and some of my more knowledgeable friends have absolutely zero idea of why they are occurring.

Problem 1: When using the Android Twitch app on my smartphone (Samsung Galaxy S7), it is for some reason completely unable to get a list of the channels that are available for viewing. I launch the app, it attempts to show my list of followed channels, and it just times out. When I switch the wifi off on my phone and tell it to use 4G, the channel list displays with no issues.

Problem 2: I play the game Final Fantasy 14. It's an MMO. Within the game, you can teleport around to various crystals. Although I can run and login to the game with zero issues, I cannot use the game's teleport action to change zones - any time I do, I am instantly disconnected from the game. Other online games I play have so far shown zero issues (mainly Rocket League).

If I go back to using my original BT Homehub, I have no issues. A friend was able to lend me a login for a VPN service he uses. If I connect to the game with the VPN service then again I have no issues in the game.

I was also able to connect to the internet by using the modem only, with its router mode enabled - couldn't test my phone but the problem with my game as described above disappears if I do that.

I've tried the router with both the latest available stock ASUS firmware and also the asuswrt merlin firmware, which has had no effect on my issue.

Anyone out there got any ideas about what might be up with this router?

Thanks in advance

EDIT: I have found a solution! I have had to reduce the MTU and MRU settings in the router from their defaults of 1492, down to 1472. This has then solved the problem for me
 
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Could you clarify a couple of things? The Netgear DM200 - is that acting as your modem, and, if so, is it set to bridge mode?

Is it possible to set the original BT Homehub to act solely as a modem (ie set it to bridge mode) and then connect the ASUS router to it? If so, does that fix things?
 
Could you clarify a couple of things? The Netgear DM200 - is that acting as your modem, and, if so, is it set to bridge mode?

Is it possible to set the original BT Homehub to act solely as a modem (ie set it to bridge mode) and then connect the ASUS router to it? If so, does that fix things?

Hello,

The BT Homehub cannot be set to bridge mode - this is why I bought the equipment. The DM200 is correctly set to modem only/bridge mode, and it has a box called "Passthrough VLAN" which I must also tick for the router to be able to connect.

HOWEVER!

I have found a solution to my problem.

I ended up having to adjust the MTU and MRU settings DOWN from their defaults of 1492, to 1472. My problems have now disappeared and my internet appears to be functioning correctly!
 
Hello,

The BT Homehub cannot be set to bridge mode - this is why I bought the equipment. The DM200 is correctly set to modem only/bridge mode, and it has a box called "Passthrough VLAN" which I must also tick for the router to be able to connect.

HOWEVER!

I have found a solution to my problem.

I ended up having to adjust the MTU and MRU settings DOWN from their defaults of 1492, to 1472. My problems have now disappeared and my internet appears to be functioning correctly!
Excellent. And thanks for the solution. It may help others in future.

And welcome to our forum, too.
 

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