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Firmware 3.8.9.6 TLS issues on 2860n+

  • rusbrc
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09 Dec 2019 22:14 #25 by rusbrc
Replied by rusbrc on topic Re: Firmware 3.8.9.6 TLS issues on 2860n+

rusbrc wrote:

hornbyp wrote:

rusbrc wrote:


Thanks - well that's something different :)



Something else that was (and is) different was my MTU...

Mine was (and is) set to 1500. Oddly, although you can enter 1520 on the "WAN1 >> Internet Access" Page, the largest value you can set on the "Path MTU Discovery" page is 1500.

(I'm fairly sure I didn't set it to 1500; I reckon it was the default.)

If I try the Path Discovery option with one of your problem web sites (www.doorstore.co.uk aka 80.76.197.136), it suggests 1500.

Which is a long-winded way of saying, you might not need to go as low as 1492 :)



Aha! It didn't even occur to me that 1520 wasn't the default - must be getting rusty.

I've got beta firmware from support i'll try with 1520, before going back to more modest MTU values.



The beta firmware resolved the issues with a 1520 MTU (and also 1500, which also didn't work).

I tried the MTU discovery - for ipv4 to the doorstore it's 1492, but for ipv6 to ipv6.google.com it's 1520 - must be where I got that figure from.

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