Broadband MTU of 1462 on business UFB connection?

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BarTender

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#231946 21-Mar-2018 18:03

Having a weird issue onsite where the MTU on a Vodafone business UFB connection in Wellington only supports an MTU of 1462.
On Windows I can do
ping 8.8.8.8 -l 1420 -f
And get a response but if I have a ping size of 1421 which would give a total packet size of 1463 then I don't get a response.
Don't have this issue on Vodafone mobile and seems to only be an issue on fixed broadband.

Anyone else having this issue?

gaddman

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#1981158 21-Mar-2018 18:06

What router are you using? Also there are some Windows settings that could limit it - when you say it's ok on mobile is that on the same PC and network connection?

gaddman

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#1981185 21-Mar-2018 18:17

Just to confirm, works fine for me on residential UFB with the UltraHub - up to 1472.

BarTender

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#1981223 21-Mar-2018 20:11

I have the same issue with the Vodafone issued HG659 with Vodafone firmware.

Also when I connect my laptop to my phone in hotspot mode I don't have this issue.

Could be a business broadband thing or something specific to Wellington.

Time to log a call with the help desk tomorrow. Wish me luck. :/

hio77

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#1981228 21-Mar-2018 20:36

seems pretty low...

I'm able to run at both 1500 and 1492 here on VF...

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Rickles

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#1981680 22-Mar-2018 18:52

I am on Voda UFB (cable) in Wellington ... TCPOptimizer tells me I'm running at 1500 MTU.

BarTender

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#1981790 23-Mar-2018 06:41

One thing to check is I am using DHCP not PPPoE as that's how the Vodafone router was setup.
Logged a case yesterday with the business help desk. Hoping I get a call back today or whenever from the T2 guys.

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hio77

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#1981815 23-Mar-2018 08:13

BarTender: One thing to check is I am using DHCP not PPPoE

My numbers were dhcp then pppoe to cover all the basis.

Good luck with the big red t2 guys

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#1984895 28-Mar-2018 13:20

It turns out it is an issue with the access point onsite. After much diagnosis of the Router (including testing a completely separate HG659), the onsite router, switch and access points.

For some odd reason the APs don't seem to handle packets above 1462. Put in another test AP I have here at home and have sorted it. Plus logged a case with the wireless provider saying it's an issue with their gear.

Talkiet

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#1984900 28-Mar-2018 13:27

Oh man... how embarassing, blaming your ISP for a user issue :-)

Cheers - N :-)

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cyril7

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#1984901 28-Mar-2018 13:27

BarTender:

It turns out it is an issue with the access point onsite. After much diagnosis of the Router (including testing a completely separate HG659), the onsite router, switch and access points.

For some odd reason the APs don't seem to handle packets above 1462. Put in another test AP I have here at home and have sorted it. Plus logged a case with the wireless provider saying it's an issue with their gear.

Hi, What brand of AP?

Cyril

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#1984932 28-Mar-2018 13:47

Talkiet:

Oh man... how embarassing, blaming your ISP for a user issue :-)

Could you blame him? it's red not blue afterall ;)

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#1984941 28-Mar-2018 14:14

cyril7:

BarTender:

It turns out it is an issue with the access point onsite. After much diagnosis of the Router (including testing a completely separate HG659), the onsite router, switch and access points.

For some odd reason the APs don't seem to handle packets above 1462. Put in another test AP I have here at home and have sorted it. Plus logged a case with the wireless provider saying it's an issue with their gear.

Hi, What brand of AP?

Cyril

Meraki. Have a full Meraki Router + Switch + AP setup here, and the router and switch are fine but any large packets that goes over the wireless network get dropped. Case has been logged and I will see how I go.