MTU for XBOX live mutliplayer gaming on 5g home broadband

[Lexx289]

I am struggling to get my Xbox to work on Xbox live. Doing some googling it seems that the MTU is too low, it is 1360 and should be about 1385 to be able to work properly. I have rung three who seem to have no knowledge of what an MTU is and have sent me to the ombudsman. I have logged into the router (H122-373) and increased the MTU manually however it will not pull through onto my XBOX. I have put it in the DMZ, enabled UPNP and generally faffed with it as much as i can but the MTU on the XBOX does not change. I am assuming this is what is being sent from three and so it is something to be changed at three's end...

Does anyone else have any experience of this, or have any issues with XBOX live and home broadband 5g? or can they get it to work, cheers

[hhlondon97]

I agree with you, because the connection was so bad they allowed me to cancel my contract for free. So even their own support can see its an issue worth offering free cancellation and compensation for yet they aren't able to fix the issue. Hopefully they see that I'm not the only one cancelling and that with more cancellations and more money lost they may actually turn to look at fixing the issue. 

[Jordamxd95]

I'm getting the same issue I've narrowed it down to being something three server related I've tried port forwarding, manually changing the mtu,  diffrent router, tethering off my phone which did work but now is giving me the same issue as I'm with I'd and they use three masts but the problem is not only on the xbox console it's self if I load the xbox app on my pc or my phone I can't connect to any xbox party's and it just says connecting then disconnects giving me an mtu error the only way I've been able to get online is by constantly changing to an alternative port on the xbox settings keep clicking random ones and trying to join party's which takes anywhere from 1 min to an hour just keep trying random ports three have blamed xbox I spoken to them they said its a broadband issue which I already knew If I tried some else's wifi who isn't with three or put a non three sim in the modem it works fine 

[Kal]

That's interesting.  Have you found a proper solution yet?

Our Xbox wouldn't connect using the Three router (it's a 5G Zyxel NR5103e) yet when we tethered it to a mobile phone using ID Mobile (who sit on Three) it worked.  No idea why though.

[hhlondon97]

@JonathanB any updates at all?

[MrSimo98]

Still waiting on my phone call back from Three, I was told I would be contacted within a week. It's been close to a month I believe. I agree with SilentBird. It is getting worse. 

[Anvil_Iron]

Has anyone tried enabling UPnP on the routers? I can see on my Zyxel router it's disabled by default. How about the ZTE and Huawei routers?

Network Setting > Home Networking > UPnP

Some router manufacturers like TP-Link have UPnP enabled by default.

[hhlondon97]

UPNP is enabled on my router for my xbox and I still have the same issue. Only benefit is my NAT Type stays open rather than moderate but still unfortunately does not affect the MTU issue.

[JonathanB]

Hi everyone,

I've merged the three different threads about this issue so that any updates can be clearer. It's best not to create new threads if an existing one clearly describes the same issue.

Just to confirm, the MTU is 1500 for the Three network, however from what I can gather, 4/5G Broadband may register as a lower MTU by the Xbox's operating system. There are quite a few examples of this being reported in other online communities for a number of service providers, both in the UK, and overseas too, and spread out over a number of years too, so it doesn't actually appear to be a new issue. 

We've had reports of this issue on the Zyxel, ZTE, and our older Huawei routers, so no particular model seems to be overall responsible for the issue, however, using differing hardware may have an impact on the signal reception and quality of connection in a location.

I'm continuing to pass feedback on about the issue, and I'll let you all know if we have any further advice, or find a solution. I'd suggest raising feedback with Xbox Live support directly too, from what I've read in the comments, most users running into this issue aren't actually having issues with speeds or connections on other devices, so it is possible that this is being caused by a software issue on the consoles.

Thanks,
Jonathan

[Kapkando]

hi Jonathan I've recently signed up too three 5g home broadband and I'm having this exact issue with the mtu 1360 on my xbox series x I'm wired with the router NR5103EV2 .even tho my speeds are great and lentecy too it keep saying there's a mtu error because 1360 is below the required amount for xbox services from what I read .I'm not actually having any issue I don't think .I'm playing games and sometimes there's some lag on warzone call of duty but I don't know if that's just coincidence .so anyway I just wanted to ask if anyone has learned anymore on this matter with the mtu I'm not sure if I should cancel or just go with it because I'm not having any issue.many thanks

[Cerberus73]

Yeah the MTU packet size games want is large now and more importantly larger than what is given via Three still which is very frustrating. Try and get games like Forza Horizon 5 or Motorsport going and it’s problematic. Do a multiplayer test and yup it’ll fail it, just not getting what it needs. 
Lag can be grim at times and the network is slower now compared to than what it used to be looking at my old Speedtest.net results it’s half.