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Author Topic: Am I being capped?  (Read 749 times)

j0hn

  • Kitizen
  • ****
  • Posts: 3637
Re: Am I being capped?
« Reply #15 on: September 16, 2021, 10:43:08 AM »

His modem and router both support baby jumbo frames
The HG612 definitely does and the USG should also.

The current testing had confirmed the modem to be good and the issue was with the router.
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Talktalk FTTP 550/75 - Speedtest - BQM

Weaver

  • Senior Kitizen
  • ******
  • Posts: 10294
  • Retd s/w dev; A&A; 3x7km lines; Firebrick; IPv6
Re: Am I being capped?
« Reply #16 on: September 16, 2021, 11:46:27 AM »

I forgot that the HG612 supports baby jumbo frames, I remember now. As you say, if the router supports PPP MTU 1508 then fragmentation is not the problem.
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jelv

  • Helpful
  • Kitizen
  • *
  • Posts: 1887
Re: Am I being capped?
« Reply #17 on: September 16, 2021, 05:03:53 PM »

Rather than speculate, couldn't ping be used to find out if packets above a certain size are being fragmented?

It looks like MTU path discovery or MSS clamping (Maximum Segment Size) isn't working/supported.
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Broadband and Line rental: Zen Unlimited Fibre 2, Mobile: Vodaphone
Router: Fritz!Box 7530
Pages: 1 [2]