MTU

[LeeM87]

I have the EE home router 2, model number b625-261 And the MTU is lower than the my Xbox series s would like. How can I increase the MTU, I'm struggling to find the setting. Thanks

[XRaySpeX]

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@mikeliuk wrote:

Edit: it's disappointing you don't have the option to change that as I get the feeling someone slightly incompetent took a guess and has negatively impacted a lot of people with no current way to fix.

Don't understand. What does that mean? What is disappointing?

[XRaySpeX]

By the same means the MTU for the O2 network is 1500. I would expect EE mobile network to be the same.

(Fixed BB is 8 bytes lower for the PPPoE/A overhead).

[LeeM87]

I have called EE and the guy said he would change MTU, I personally don't think he knows what it was. He said he changed some settings to boost my connection and started talking about an antenna.

However, since he has 'boosted' my speeds I have gone from 40-120mb download and 20mb upload to 5-10mb on both.

I asked him to revert the changes and he said that there are problems in my area. I said the connection other than the MTU was fine before this call. He said that he has raised a ticket about the area fault.

How has it gone from an MTU query to an area fault within one call?

Guy couldn't get off the phone quick enough.

Now I'm stuck with low speeds and low MTU 😞

[XRaySpeX]

Can you check what your MTU actually is using my method with the loop:

for /L %i in (1500,-1,1460) DO ping -n 1 -f -l %i bbc.co.uk ?

I can't believe it's as low as 1320. 

[mikeliuk · Accepted solution]

Hi @LeeM87 ,

I think that's the most impressive thing I've heard all month! 😂

The MTU setting which needed increasing is likely a setting on your router and as you saw no option to change it, I didn't expect it could be done remotely.

I always remind my colleagues that things go wrong and disasters happen because someone was trying to improve something and make it better. No one starts out their day planning to cause some global issue.

As the engineer was unable to revert the change, either it was an amazing coincidence or it should be ruled out that the change didn't exacerbate or cause the area issue.

The best you can do is use the hints on this thread to probe what the measured MTU is. Hopefully it will be unchanged at the low value you quoted. Maybe it has increased to near 1492 or 1500. Unlikely but it might have dropped lower than your quoted low value which would have taken quite some incompetence to have accomplished.

Best not to panic and take the service provider which shall not be named's word that it is an area issue which the engineer had run away to solve. Presumably if you register your location on the coverage query page, you will be notified when the area issue is fixed.